Zimmermann-Laband Syndrome

Mendelian MONDO:0000200 Pathograph 18 hereditary disease multiple congenital anomalies syndrome syndromic neurodevelopmental disorder potassium channelopathy

Zimmermann-Laband syndrome is a rare multiple congenital anomalies and neurodevelopmental disorder characterized by gingival fibromatosis, coarse facial appearance, hypertrichosis, intellectual disability, and hypoplastic or absent nails or terminal phalanges. It is genetically heterogeneous, with pathogenic variants in KCNH1, KCNN3, and ATP6V1B2 reported in affected individuals.

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1
Mappings
1
Inheritance
6
Pathophys.
44
Phenotypes
18
Pathograph
3
Genes
2
Treatments
8
References
1
Deep Research
🔗

Mappings

MONDO
MONDO:0000200 Zimmermann-Laband syndrome
skos:exactMatch MONDO
👪

Inheritance

1
Autosomal dominant inheritance HP:0000006
Most molecularly solved cases are sporadic or de novo dominant potassium channelopathy cases, although older literature and Orphanet note familial aggregation and autosomal-recessive hypotheses.
Autosomal dominant inheritance
Show evidence (2 references)
PMID:23994350 SUPPORT Human Clinical
"An autosomal dominant mutation with high mutation rate and rare instances of germinal mosaicism seems the most likely inheritance pattern."
Literature review of sporadic and familial cases supports autosomal dominant inheritance with possible germline mosaicism.
PMID:31155282 SUPPORT Human Clinical
"We report de novo missense variants in KCNN3 in three individuals with typical clinical features of ZLS."
De novo KCNN3 variants in typical ZLS cases support dominant inheritance for a molecular subtype.
⚙

Pathophysiology

6
Increased potassium-channel conductance
ZLS-associated KCNH1 and KCNN3 missense variants increase potassium channel activity or conductance, defining a syndromic neurodevelopmental potassium channelopathy mechanism for many molecularly solved cases.
KCNH1 link KCNN3 link
potassium ion transmembrane transport link ↑ INCREASED
voltage-gated potassium channel activity link ↑ INCREASED calcium-activated potassium channel activity link ↑ INCREASED
Downstream
Neurodevelopmental potassium-channel dysfunction
Gingival and dental developmental overgrowth
Distal digital and nail developmental abnormality
Show evidence (3 references)
PMID:25915598 SUPPORT In Vitro
"These data support a gain-of-function effect for all ZLS-associated KCNH1 mutants."
Patch-clamp functional data support increased KCNH1 channel function for ZLS-associated variants.
PMID:31155282 SUPPORT In Vitro
"Patch-clamp whole-cell recordings of KCNN3 channel-expressing CHO cells demonstrated that disease-associated mutations result in gain of function of the mutant channels, characterized by increased Ca2+ sensitivity leading to faster and more complete activation of KCNN3 mutant channels."
CHO-cell patch-clamp data support increased KCNN3 channel activity in ZLS-associated variants.
PMID:33594261 SUPPORT Human Clinical
"We suggest to combine the phenotypes and define a new subgroup of potassium channelopathies caused by increased K+ conductance, referred to as syndromic neurodevelopmental K+ channelopathies due to dominant variants in KCNH1, KCNK4, or KCNN3."
Human genotype-phenotype review places KCNH1 and KCNN3 ZLS in a gain-of-conductance potassium-channelopathy group.
ATP6V1B2 V-ATPase complex perturbation
Recurrent de novo ATP6V1B2 missense variation affects the B2 subunit of the vacuolar H+ ATPase and is predicted to perturb complex assembly in a genetically heterogeneous subset of ZLS.
ATP6V1B2 link
vacuolar acidification link ↕ DYSREGULATED
proton transmembrane transporter activity link ↕ DYSREGULATED
Downstream
Neurodevelopmental potassium-channel dysfunction
Distal digital and nail developmental abnormality
Show evidence (2 references)
PMID:25915598 SUPPORT Human Clinical
"We also identified a recurrent de novo missense change in ATP6V1B2, encoding the B2 subunit of the multimeric vacuolar H(+) ATPase, in two individuals with ZLS."
The genetic study identifies recurrent de novo ATP6V1B2 variation in individuals with ZLS.
PMID:25915598 SUPPORT Computational
"Structural analysis predicts a perturbing effect of the mutation on complex assembly."
Computational structural analysis supports V-ATPase complex perturbation for the ATP6V1B2 variant.
Neurodevelopmental potassium-channel dysfunction
Dominant potassium-channel variants associated with ZLS converge on developmental delay or intellectual disability and seizure susceptibility.
central nervous system link
Downstream
Intellectual disability
Seizure
Show evidence (2 references)
PMID:33594261 SUPPORT Human Clinical
"There is notable overlap in the phenotypic findings of these syndromes associated with dominant KCNN3, KCNH1, and KCNK4 variants, sharing developmental delay and/or ID, coarse facial features, gingival enlargement, distal digital hypoplasia, and hypertrichosis."
Human potassium-channelopathy cases share developmental delay or intellectual disability with other ZLS features.
PMID:31155282 SUPPORT Human Clinical
"With the report on de novo KCNK4 mutations in subjects with facial dysmorphism, hypertrichosis, epilepsy, ID, and gingival overgrowth, we propose to combine the phenotypes caused by mutations in KCNH1, KCNK4, and KCNN3 in a group of neurological potassium channelopathies caused by an increase in..."
The clinical-genetic synthesis links increased K+ conductance channelopathies with neurologic phenotypes including epilepsy and intellectual disability.
Gingival and dental developmental overgrowth
Gingival fibromatosis can cover tooth crowns and delay eruption, producing functional and aesthetic complications that may require early oral therapy and gingivoplasty.
gingiva link
Downstream
Gingival fibromatosis
Delayed eruption of teeth
Anterior open-bite malocclusion
Show evidence (1 reference)
PMID:40604848 SUPPORT Human Clinical
"A common manifestation of these syndromes is gingival fibromatosis, which may partially or completely cover tooth crowns, leading in some cases to functional and aesthetic problems, as well as delayed tooth eruption."
The case report and protocol links KCNH1-related syndromic gingival fibromatosis with tooth coverage and delayed eruption.
Distal digital and nail developmental abnormality
Hypoplasia or aplasia of nails and terminal phalanges is a core distal digital developmental feature of ZLS.
fingernail link
Downstream
Hypoplastic fingernail
Absent fingernail
Show evidence (1 reference)
PMID:25915598 SUPPORT Human Clinical
"Zimmermann-Laband syndrome (ZLS) is a developmental disorder characterized by facial dysmorphism with gingival enlargement, intellectual disability, hypoplasia or aplasia of nails and terminal phalanges, and hypertrichosis."
The molecular genetics paper identifies nail and terminal phalanx hypoplasia or aplasia as core ZLS features.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Zimmermann-Laband Syndrome Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.
●

Phenotypes

44
Cardiovascular 1
Splenomegaly OCCASIONAL Splenomegaly (HP:0001744)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001744 | Splenomegaly | Occasional (29-5%)"
Orphanet records splenomegaly as occasional.
Digestive 1
Hepatomegaly OCCASIONAL Hepatomegaly (HP:0002240)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0002240 | Hepatomegaly | Occasional (29-5%)"
Orphanet records hepatomegaly as occasional.
Ear 1
Sensorineural hearing impairment VERY_RARE Sensorineural hearing impairment (HP:0000407)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000407 | Sensorineural hearing impairment | Very rare (<4-1%)"
Orphanet records sensorineural hearing impairment as very rare.
Eye 2
Hypertelorism OCCASIONAL Hypertelorism (HP:0000316)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000316 | Hypertelorism | Occasional (29-5%)"
Orphanet records hypertelorism as occasional.
Cataract OCCASIONAL Cataract (HP:0000518)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000518 | Cataract | Occasional (29-5%)"
Orphanet records cataract as occasional.
Head and Neck 12
Wide mouth FREQUENT Wide mouth (HP:0000154)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000154 | Wide mouth | Frequent (79-30%)"
Orphanet records wide mouth as frequent.
Bulbous nose FREQUENT Bulbous nose (HP:0000414)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000414 | Bulbous nose | Frequent (79-30%)"
Orphanet records bulbous nose as frequent.
Macroglossia OCCASIONAL Macroglossia (HP:0000158)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000158 | Macroglossia | Occasional (29-5%)"
Orphanet records macroglossia as occasional.
Cleft palate OCCASIONAL Cleft palate (HP:0000175)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000175 | Cleft palate | Occasional (29-5%)"
Orphanet records cleft palate as occasional.
Bifid uvula OCCASIONAL Bifid uvula (HP:0000193)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000193 | Bifid uvula | Occasional (29-5%)"
Orphanet records bifid uvula as occasional.
High palate OCCASIONAL High palate (HP:0000218)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000218 | High palate | Occasional (29-5%)"
Orphanet records high palate as occasional.
Micrognathia OCCASIONAL Micrognathia (HP:0000347)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000347 | Micrognathia | Occasional (29-5%)"
Orphanet records micrognathia as occasional.
Short neck OCCASIONAL Short neck (HP:0000470)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000470 | Short neck | Occasional (29-5%)"
Orphanet records short neck as occasional.
Downslanted palpebral fissures OCCASIONAL Downslanted palpebral fissures (HP:0000494)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000494 | Downslanted palpebral fissures | Occasional (29-5%)"
Orphanet records downslanted palpebral fissures as occasional.
Hypodontia OCCASIONAL Hypodontia (HP:0000668)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000668 | Hypodontia | Occasional (29-5%)"
Orphanet records hypodontia as occasional.
Supernumerary tooth OCCASIONAL Supernumerary tooth (HP:0011069)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0011069 | Supernumerary tooth | Occasional (29-5%)"
Orphanet records supernumerary tooth as occasional.
Delayed eruption of teeth OCCASIONAL Delayed eruption of teeth (HP:0000684)
Show evidence (1 reference)
PMID:40604848 SUPPORT Human Clinical
"A common manifestation of these syndromes is gingival fibromatosis, which may partially or completely cover tooth crowns, leading in some cases to functional and aesthetic problems, as well as delayed tooth eruption."
The case report and protocol supports delayed tooth eruption as a complication of gingival fibromatosis.
Limbs 2
Pes cavus OCCASIONAL Pes cavus (HP:0001761)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001761 | Pes cavus | Occasional (29-5%)"
Orphanet records pes cavus as occasional.
Pes planus OCCASIONAL Pes planus (HP:0001763)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001763 | Pes planus | Occasional (29-5%)"
Orphanet records pes planus as occasional.
Musculoskeletal 2
Joint hypermobility FREQUENT Joint hypermobility (HP:0001382)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001382 | Joint hypermobility | Frequent (79-30%)"
Orphanet records joint hypermobility as frequent.
Floppy infant OCCASIONAL Floppy infant (HP:0008947)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0008947 | Floppy infant | Occasional (29-5%)"
Orphanet records floppy infant as occasional.
Nervous System 2
Intellectual disability FREQUENT Intellectual disability (HP:0001249)
Show evidence (2 references)
ORPHA:3473 SUPPORT Other
"HP:0001249 | Intellectual disability | Frequent (79-30%)"
Orphanet records intellectual disability as frequent.
PMID:23994350 SUPPORT Human Clinical
"Tabulation of clinical features confirmed the core phenotype and identified developmental delay as the unique major clinical problem (occurring in 40% of the cases) with a moderately high risk of epilepsy (13%)."
Literature review supports frequent neurodevelopmental involvement and a quantitative developmental-delay frequency.
Seizure OCCASIONAL Seizure (HP:0001250)
Show evidence (2 references)
ORPHA:3473 SUPPORT Other
"HP:0001250 | Seizure | Occasional (29-5%)"
Orphanet records seizure as occasional.
PMID:23994350 SUPPORT Human Clinical
"Tabulation of clinical features confirmed the core phenotype and identified developmental delay as the unique major clinical problem (occurring in 40% of the cases) with a moderately high risk of epilepsy (13%)."
Literature review reports epilepsy in 13% of reviewed cases, consistent with occasional frequency.
Growth 1
Growth delay OCCASIONAL Growth delay (HP:0001510)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001510 | Growth delay | Occasional (29-5%)"
Orphanet records growth delay as occasional.
Other 20
Gingival fibromatosis OBLIGATE Gingival fibromatosis (HP:0000169)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000169 | Gingival fibromatosis | Obligate (100%)"
Orphanet records gingival fibromatosis as obligate.
Wide nose FREQUENT Wide nose (HP:0000445)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000445 | Wide nose | Frequent (79-30%)"
Orphanet records wide nose as frequent.
Hypoplastic fingernail FREQUENT Hypoplastic fingernail (HP:0001804)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001804 | Hypoplastic fingernail | Frequent (79-30%)"
Orphanet records hypoplastic fingernail as frequent.
Absent fingernail FREQUENT Absent fingernail (HP:0001817)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001817 | Absent fingernail | Frequent (79-30%)"
Orphanet records absent fingernail as frequent.
Large fleshy ears FREQUENT Large fleshy ears (HP:0002265)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0002265 | Large fleshy ears | Frequent (79-30%)"
Orphanet records large fleshy ears as frequent.
Generalized hypertrichosis FREQUENT Generalized hypertrichosis (HP:0004554)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0004554 | Generalized hypertrichosis | Frequent (79-30%)"
Orphanet records generalized hypertrichosis as frequent.
Anterior open-bite malocclusion FREQUENT Anterior open-bite malocclusion (HP:0009102)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0009102 | Anterior open-bite malocclusion | Frequent (79-30%)"
Orphanet records anterior open-bite malocclusion as frequent.
Thickened ears FREQUENT Thickened ears (HP:0009894)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0009894 | Thickened ears | Frequent (79-30%)"
Orphanet records thickened ears as frequent.
Telecanthus OCCASIONAL Telecanthus (HP:0000506)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000506 | Telecanthus | Occasional (29-5%)"
Orphanet records telecanthus as occasional.
Long eyelashes OCCASIONAL Long eyelashes (HP:0000527)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000527 | Long eyelashes | Occasional (29-5%)"
Orphanet records long eyelashes as occasional.
Thick eyebrow OCCASIONAL Thick eyebrow (HP:0000574)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000574 | Thick eyebrow | Occasional (29-5%)"
Orphanet records thick eyebrow as occasional.
Abnormal external genitalia OCCASIONAL Abnormal external genitalia morphology (HP:0000811)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000811 | Abnormal external genitalia | Occasional (29-5%)"
Orphanet records abnormal external genitalia as occasional.
Soft skin OCCASIONAL Soft skin (HP:0000977)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0000977 | Soft skin | Occasional (29-5%)"
Orphanet records soft skin as occasional.
Hallux valgus OCCASIONAL Hallux valgus (HP:0001822)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001822 | Hallux valgus | Occasional (29-5%)"
Orphanet records hallux valgus as occasional.
Facial hypertrichosis OCCASIONAL Facial hypertrichosis (HP:0002219)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0002219 | Facial hypertrichosis | Occasional (29-5%)"
Orphanet records facial hypertrichosis as occasional.
Abnormal cardiovascular system morphology OCCASIONAL Abnormal cardiovascular system morphology (HP:0030680)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0030680 | Abnormal cardiovascular system morphology | Occasional (29-5%)"
Orphanet records abnormal cardiovascular system morphology as occasional.
Deep plantar creases VERY_RARE Deep plantar creases (HP:0001869)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0001869 | Deep plantar creases | Very rare (<4-1%)"
Orphanet records deep plantar creases as very rare.
Deep palmar crease VERY_RARE Deep palmar crease (HP:0006191)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0006191 | Deep palmar crease | Very rare (<4-1%)"
Orphanet records deep palmar crease as very rare.
Overtubulated long bones VERY_RARE Overtubulated long bones (HP:0006391)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0006391 | Overtubulated long bones | Very rare (<4-1%)"
Orphanet records overtubulated long bones as very rare.
Generalized hyperpigmentation VERY_RARE Generalized hyperpigmentation (HP:0007440)
Show evidence (1 reference)
ORPHA:3473 SUPPORT Other
"HP:0007440 | Generalized hyperpigmentation | Very rare (<4-1%)"
Orphanet records generalized hyperpigmentation as very rare.
🧬

Genetic Associations

3
KCNH1 gain-of-function variants (Causative)
Show evidence (2 references)
PMID:25915598 SUPPORT Human Clinical
"We report that heterozygous missense mutations in KCNH1 account for a considerable proportion of ZLS."
The study identifies heterozygous KCNH1 missense variants as a common molecular cause.
ORPHA:3473 SUPPORT Other
"KCNH1 | potassium voltage-gated channel subfamily H member 1 | hgnc:6250 | Disease-causing germline mutation(s) in"
Orphanet lists KCNH1 as a disease-causing germline gene for ZLS.
KCNN3 gain-of-function variants (Causative)
Show evidence (2 references)
PMID:31155282 SUPPORT Human Clinical
"We report de novo missense variants in KCNN3 in three individuals with typical clinical features of ZLS."
The study directly identifies de novo KCNN3 variants in individuals with typical ZLS.
ORPHA:3473 SUPPORT Other
"KCNN3 | potassium calcium-activated channel subfamily N member 3 | hgnc:6292 | Disease-causing germline mutation(s) (gain of function) in"
Orphanet lists gain-of-function KCNN3 disease-causing germline variants for ZLS.
ATP6V1B2 missense variants (Causative)
Show evidence (2 references)
PMID:25915598 SUPPORT Human Clinical
"We also identified a recurrent de novo missense change in ATP6V1B2, encoding the B2 subunit of the multimeric vacuolar H(+) ATPase, in two individuals with ZLS."
The study identifies recurrent de novo ATP6V1B2 variants in two ZLS individuals.
ORPHA:3473 SUPPORT Other
"ATP6V1B2 | ATPase H+ transporting V1 subunit B2 | hgnc:854 | Disease-causing germline mutation(s) in"
Orphanet lists ATP6V1B2 as a disease-causing germline gene for ZLS.
💊

Treatments

2
Gingivectomy and gingivoplasty for gingival fibromatosis
Action: surgical procedure MAXO:0000004
Surgical removal and reshaping of hyperplastic gingiva can expose teeth, improve occlusion, restore dental function, and improve oral aesthetics.
Target Phenotypes: gingival fibromatosis ↗ delayed eruption of teeth ↗
Show evidence (2 references)
PMID:39087232 SUPPORT Human Clinical
"Gingivectomy and gingivoplasty were performed under general anesthesia. After surgery, the gingival appearance improved significantly, and the masticatory function of the teeth was restored."
A ZLS case report documents functional improvement after gingivectomy and gingivoplasty.
PMID:40604848 SUPPORT Human Clinical
"This case illustrates the need for appropriate and early gingivoplasty to prevent teeth impaction and restore dental function."
The proposed protocol supports early gingivoplasty for gingival fibromatosis-associated tooth impaction and dental dysfunction.
Myofunctional and speech-language oral therapy
Action: supportive care MAXO:0000950
Myofunctional and speech-language therapy may support biting, chewing, and tongue-function rehabilitation before or alongside surgical exposure of submerged teeth.
Target Phenotypes: delayed eruption of teeth ↗
Show evidence (1 reference)
PMID:40604848 SUPPORT Human Clinical
"The first step of oral treatment consisted of myofunctional and speech/language therapy to stimulate biting and chewing. It also helped with the rehabilitation of proper tongue function."
The case protocol supports supportive oral therapy to improve biting, chewing, and tongue function.
{ }

Source YAML

click to show 
name: Zimmermann-Laband Syndrome
category: Mendelian
creation_date: "2026-05-09T21:19:51Z"
updated_date: "2026-05-09T21:19:51Z"
synonyms:
- Laband syndrome
- Gingival fibromatosis-hepatosplenomegaly-other anomalies syndrome
- ZLS
description: >
  Zimmermann-Laband syndrome is a rare multiple congenital anomalies and
  neurodevelopmental disorder characterized by gingival fibromatosis, coarse
  facial appearance, hypertrichosis, intellectual disability, and hypoplastic or
  absent nails or terminal phalanges. It is genetically heterogeneous, with
  pathogenic variants in KCNH1, KCNN3, and ATP6V1B2 reported in affected
  individuals.
disease_term:
  preferred_term: Zimmermann-Laband syndrome
  term:
    id: MONDO:0000200
    label: Zimmermann-Laband syndrome
mappings:
  mondo_mappings:
  - term:
      id: MONDO:0000200
      label: Zimmermann-Laband syndrome
    mapping_predicate: skos:exactMatch
    mapping_source: MONDO
parents:
- hereditary disease
- multiple congenital anomalies syndrome
- syndromic neurodevelopmental disorder
- potassium channelopathy
external_assertions:
- name: Orphanet Zimmermann-Laband syndrome record
  source: Orphanet
  assertion_type: structured_disease_record
  external_id: ORPHA:3473
  url: http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=en&Expert=3473
  description: >
    Orphanet's ORPHA:3473 structured record provides the disease definition,
    neonatal onset, inheritance assertion, epidemiology, cross-references,
    gene-disease rows, and HPO phenotype rows used in this entry.
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "A rare genetic multiple congenital anomalies syndrome characterized by gingival fibromatosis, coarse facial appearance, and absence or hypoplasia of nails or terminal phalanges of hands and feet."
    explanation: Orphanet defines the core clinical concept curated here.
inheritance:
- name: Autosomal dominant inheritance
  description: >
    Most molecularly solved cases are sporadic or de novo dominant potassium
    channelopathy cases, although older literature and Orphanet note familial
    aggregation and autosomal-recessive hypotheses.
  inheritance_term:
    preferred_term: Autosomal dominant inheritance
    term:
      id: HP:0000006
      label: Autosomal dominant inheritance
  evidence:
  - reference: PMID:23994350
    reference_title: Clinical and genetic study of two patients with Zimmermann-Laband syndrome and literature review.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "An autosomal dominant mutation with high mutation rate and rare instances of germinal mosaicism seems the most likely inheritance pattern."
    explanation: Literature review of sporadic and familial cases supports autosomal dominant inheritance with possible germline mosaicism.
  - reference: PMID:31155282
    reference_title: Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We report de novo missense variants in KCNN3 in three individuals with typical clinical features of ZLS."
    explanation: De novo KCNN3 variants in typical ZLS cases support dominant inheritance for a molecular subtype.
pathophysiology:
- name: Increased potassium-channel conductance
  description: >
    ZLS-associated KCNH1 and KCNN3 missense variants increase potassium channel
    activity or conductance, defining a syndromic neurodevelopmental potassium
    channelopathy mechanism for many molecularly solved cases.
  role: trigger
  genes:
  - preferred_term: KCNH1
    term:
      id: hgnc:6250
      label: KCNH1
  - preferred_term: KCNN3
    term:
      id: hgnc:6292
      label: KCNN3
  biological_processes:
  - preferred_term: potassium ion transmembrane transport
    term:
      id: GO:0071805
      label: potassium ion transmembrane transport
    modifier: INCREASED
  molecular_functions:
  - preferred_term: voltage-gated potassium channel activity
    term:
      id: GO:0005249
      label: voltage-gated potassium channel activity
    modifier: INCREASED
  - preferred_term: calcium-activated potassium channel activity
    term:
      id: GO:0015269
      label: calcium-activated potassium channel activity
    modifier: INCREASED
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "These data support a gain-of-function effect for all ZLS-associated KCNH1 mutants."
    explanation: Patch-clamp functional data support increased KCNH1 channel function for ZLS-associated variants.
  - reference: PMID:31155282
    reference_title: Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Patch-clamp whole-cell recordings of KCNN3 channel-expressing CHO cells demonstrated that disease-associated mutations result in gain of function of the mutant channels, characterized by increased Ca2+ sensitivity leading to faster and more complete activation of KCNN3 mutant channels."
    explanation: CHO-cell patch-clamp data support increased KCNN3 channel activity in ZLS-associated variants.
  - reference: PMID:33594261
    reference_title: "Syndromic disorders caused by gain-of-function variants in KCNH1, KCNK4, and KCNN3-a subgroup of K(+) channelopathies."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We suggest to combine the phenotypes and define a new subgroup of potassium channelopathies caused by increased K+ conductance, referred to as syndromic neurodevelopmental K+ channelopathies due to dominant variants in KCNH1, KCNK4, or KCNN3."
    explanation: Human genotype-phenotype review places KCNH1 and KCNN3 ZLS in a gain-of-conductance potassium-channelopathy group.
  downstream:
  - target: Neurodevelopmental potassium-channel dysfunction
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Gingival and dental developmental overgrowth
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Distal digital and nail developmental abnormality
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: ATP6V1B2 V-ATPase complex perturbation
  description: >
    Recurrent de novo ATP6V1B2 missense variation affects the B2 subunit of the
    vacuolar H+ ATPase and is predicted to perturb complex assembly in a
    genetically heterogeneous subset of ZLS.
  role: trigger
  genes:
  - preferred_term: ATP6V1B2
    term:
      id: hgnc:854
      label: ATP6V1B2
  biological_processes:
  - preferred_term: vacuolar acidification
    term:
      id: GO:0007035
      label: vacuolar acidification
    modifier: DYSREGULATED
  molecular_functions:
  - preferred_term: proton transmembrane transporter activity
    term:
      id: GO:0015078
      label: proton transmembrane transporter activity
    modifier: DYSREGULATED
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We also identified a recurrent de novo missense change in ATP6V1B2, encoding the B2 subunit of the multimeric vacuolar H(+) ATPase, in two individuals with ZLS."
    explanation: The genetic study identifies recurrent de novo ATP6V1B2 variation in individuals with ZLS.
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: COMPUTATIONAL
    snippet: "Structural analysis predicts a perturbing effect of the mutation on complex assembly."
    explanation: Computational structural analysis supports V-ATPase complex perturbation for the ATP6V1B2 variant.
  downstream:
  - target: Neurodevelopmental potassium-channel dysfunction
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Distal digital and nail developmental abnormality
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: KCNH1-related ciliary signaling disruption
  description: >
    KCNH1 localizes to ciliary structures in human cells, and pathogenic
    missense variants perturb cilium morphology, assembly and disassembly, and
    Sonic Hedgehog signaling, suggesting a cellular developmental mechanism
    downstream of some KCNH1 variants.
  role: effector
  genes:
  - preferred_term: KCNH1
    term:
      id: hgnc:6250
      label: KCNH1
  biological_processes:
  - preferred_term: cilium assembly
    term:
      id: GO:0060271
      label: cilium assembly
    modifier: DYSREGULATED
  cellular_components:
  - preferred_term: cilium
    term:
      id: GO:0005929
      label: cilium
  evidence:
  - reference: PMID:35639255
    reference_title: Potassium Channel KCNH1 Activating Variants Cause Altered Functional and Morphological Ciliogenesis.
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "In this work, we provide evidence that KCNH1 localizes at the base of the cilium in pre-ciliary vesicles and ciliary pocket of human dermal fibroblasts and retinal pigment epithelial (hTERT RPE1) cells and that the pathogenic missense variants (L352V and R330Q; NP_002229.1) perturb cilia morphology, assembly/disassembly, and Sonic Hedgehog signaling, disclosing a multifaceted role of the protein."
    explanation: Human fibroblast and RPE1 cell data support ciliary localization and altered ciliogenesis/signaling for pathogenic KCNH1 variants.
  downstream:
  - target: Gingival and dental developmental overgrowth
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Distal digital and nail developmental abnormality
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: Neurodevelopmental potassium-channel dysfunction
  description: >
    Dominant potassium-channel variants associated with ZLS converge on
    developmental delay or intellectual disability and seizure susceptibility.
  role: downstream_pathology
  locations:
  - preferred_term: central nervous system
    term:
      id: UBERON:0001017
      label: central nervous system
  evidence:
  - reference: PMID:33594261
    reference_title: "Syndromic disorders caused by gain-of-function variants in KCNH1, KCNK4, and KCNN3-a subgroup of K(+) channelopathies."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "There is notable overlap in the phenotypic findings of these syndromes associated with dominant KCNN3, KCNH1, and KCNK4 variants, sharing developmental delay and/or ID, coarse facial features, gingival enlargement, distal digital hypoplasia, and hypertrichosis."
    explanation: Human potassium-channelopathy cases share developmental delay or intellectual disability with other ZLS features.
  - reference: PMID:31155282
    reference_title: Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "With the report on de novo KCNK4 mutations in subjects with facial dysmorphism, hypertrichosis, epilepsy, ID, and gingival overgrowth, we propose to combine the phenotypes caused by mutations in KCNH1, KCNK4, and KCNN3 in a group of neurological potassium channelopathies caused by an increase in K+ conductance."
    explanation: The clinical-genetic synthesis links increased K+ conductance channelopathies with neurologic phenotypes including epilepsy and intellectual disability.
  downstream:
  - target: Intellectual disability
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Seizure
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: Gingival and dental developmental overgrowth
  description: >
    Gingival fibromatosis can cover tooth crowns and delay eruption, producing
    functional and aesthetic complications that may require early oral therapy
    and gingivoplasty.
  role: downstream_pathology
  locations:
  - preferred_term: gingiva
    term:
      id: UBERON:0001828
      label: gingiva
  evidence:
  - reference: PMID:40604848
    reference_title: "Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A common manifestation of these syndromes is gingival fibromatosis, which may partially or completely cover tooth crowns, leading in some cases to functional and aesthetic problems, as well as delayed tooth eruption."
    explanation: The case report and protocol links KCNH1-related syndromic gingival fibromatosis with tooth coverage and delayed eruption.
  downstream:
  - target: Gingival fibromatosis
    causal_link_type: DIRECT
  - target: Delayed eruption of teeth
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
  - target: Anterior open-bite malocclusion
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: Distal digital and nail developmental abnormality
  description: >
    Hypoplasia or aplasia of nails and terminal phalanges is a core distal
    digital developmental feature of ZLS.
  role: downstream_pathology
  locations:
  - preferred_term: fingernail
    term:
      id: UBERON:0009565
      label: nail of manual digit
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Zimmermann-Laband syndrome (ZLS) is a developmental disorder characterized by facial dysmorphism with gingival enlargement, intellectual disability, hypoplasia or aplasia of nails and terminal phalanges, and hypertrichosis."
    explanation: The molecular genetics paper identifies nail and terminal phalanx hypoplasia or aplasia as core ZLS features.
  downstream:
  - target: Hypoplastic fingernail
    causal_link_type: DIRECT
  - target: Absent fingernail
    causal_link_type: DIRECT
genetic:
- name: KCNH1 gain-of-function variants
  gene_term:
    preferred_term: KCNH1
    term:
      id: hgnc:6250
      label: KCNH1
  association: Causative
  features: >
    Heterozygous KCNH1 missense variants account for a substantial proportion of
    molecularly solved ZLS and act through gain-of-function effects on the Eag1
    voltage-gated potassium channel.
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We report that heterozygous missense mutations in KCNH1 account for a considerable proportion of ZLS."
    explanation: The study identifies heterozygous KCNH1 missense variants as a common molecular cause.
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "KCNH1 | potassium voltage-gated channel subfamily H member 1 | hgnc:6250 | Disease-causing germline mutation(s) in"
    explanation: Orphanet lists KCNH1 as a disease-causing germline gene for ZLS.
- name: KCNN3 gain-of-function variants
  gene_term:
    preferred_term: KCNN3
    term:
      id: hgnc:6292
      label: KCNN3
  association: Causative
  features: >
    De novo KCNN3 missense variants cause a typical ZLS phenotype through gain
    of function of the SK3 calcium-activated potassium channel.
  evidence:
  - reference: PMID:31155282
    reference_title: Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We report de novo missense variants in KCNN3 in three individuals with typical clinical features of ZLS."
    explanation: The study directly identifies de novo KCNN3 variants in individuals with typical ZLS.
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "KCNN3 | potassium calcium-activated channel subfamily N member 3 | hgnc:6292 | Disease-causing germline mutation(s) (gain of function) in"
    explanation: Orphanet lists gain-of-function KCNN3 disease-causing germline variants for ZLS.
- name: ATP6V1B2 missense variants
  gene_term:
    preferred_term: ATP6V1B2
    term:
      id: hgnc:854
      label: ATP6V1B2
  association: Causative
  features: >
    Recurrent de novo ATP6V1B2 missense variation contributes to genetic
    heterogeneity in ZLS and is predicted to affect vacuolar H+ ATPase complex
    assembly.
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We also identified a recurrent de novo missense change in ATP6V1B2, encoding the B2 subunit of the multimeric vacuolar H(+) ATPase, in two individuals with ZLS."
    explanation: The study identifies recurrent de novo ATP6V1B2 variants in two ZLS individuals.
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "ATP6V1B2 | ATPase H+ transporting V1 subunit B2 | hgnc:854 | Disease-causing germline mutation(s) in"
    explanation: Orphanet lists ATP6V1B2 as a disease-causing germline gene for ZLS.
phenotypes:
- category: Oral
  name: Gingival fibromatosis
  frequency: OBLIGATE
  description: Gingival fibromatosis is the obligate oral feature in Orphanet's ZLS phenotype table.
  phenotype_term:
    preferred_term: gingival fibromatosis
    term:
      id: HP:0000169
      label: Gingival fibromatosis
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000169 | Gingival fibromatosis | Obligate (100%)"
    explanation: Orphanet records gingival fibromatosis as obligate.
- category: Craniofacial
  name: Wide mouth
  frequency: FREQUENT
  description: Wide mouth is a frequent craniofacial feature.
  phenotype_term:
    preferred_term: wide mouth
    term:
      id: HP:0000154
      label: Wide mouth
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000154 | Wide mouth | Frequent (79-30%)"
    explanation: Orphanet records wide mouth as frequent.
- category: Craniofacial
  name: Bulbous nose
  frequency: FREQUENT
  description: Bulbous nose is a frequent craniofacial feature.
  phenotype_term:
    preferred_term: bulbous nose
    term:
      id: HP:0000414
      label: Bulbous nose
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000414 | Bulbous nose | Frequent (79-30%)"
    explanation: Orphanet records bulbous nose as frequent.
- category: Craniofacial
  name: Wide nose
  frequency: FREQUENT
  description: Wide nose is a frequent craniofacial feature.
  phenotype_term:
    preferred_term: wide nose
    term:
      id: HP:0000445
      label: Wide nose
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000445 | Wide nose | Frequent (79-30%)"
    explanation: Orphanet records wide nose as frequent.
- category: Neurologic
  name: Intellectual disability
  frequency: FREQUENT
  description: Intellectual disability is a frequent neurodevelopmental feature.
  phenotype_term:
    preferred_term: intellectual disability
    term:
      id: HP:0001249
      label: Intellectual disability
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001249 | Intellectual disability | Frequent (79-30%)"
    explanation: Orphanet records intellectual disability as frequent.
  - reference: PMID:23994350
    reference_title: Clinical and genetic study of two patients with Zimmermann-Laband syndrome and literature review.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Tabulation of clinical features confirmed the core phenotype and identified developmental delay as the unique major clinical problem (occurring in 40% of the cases) with a moderately high risk of epilepsy (13%)."
    explanation: Literature review supports frequent neurodevelopmental involvement and a quantitative developmental-delay frequency.
- category: Musculoskeletal
  name: Joint hypermobility
  frequency: FREQUENT
  description: Joint hypermobility is a frequent musculoskeletal feature.
  phenotype_term:
    preferred_term: joint hypermobility
    term:
      id: HP:0001382
      label: Joint hypermobility
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001382 | Joint hypermobility | Frequent (79-30%)"
    explanation: Orphanet records joint hypermobility as frequent.
- category: Nail
  name: Hypoplastic fingernail
  frequency: FREQUENT
  description: Hypoplastic fingernails are a frequent distal digital feature.
  phenotype_term:
    preferred_term: hypoplastic fingernail
    term:
      id: HP:0001804
      label: Hypoplastic fingernail
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001804 | Hypoplastic fingernail | Frequent (79-30%)"
    explanation: Orphanet records hypoplastic fingernail as frequent.
- category: Nail
  name: Absent fingernail
  frequency: FREQUENT
  description: Absent fingernails are a frequent distal digital feature.
  phenotype_term:
    preferred_term: absent fingernail
    term:
      id: HP:0001817
      label: Absent fingernail
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001817 | Absent fingernail | Frequent (79-30%)"
    explanation: Orphanet records absent fingernail as frequent.
- category: Ear
  name: Large fleshy ears
  frequency: FREQUENT
  description: Large fleshy ears are a frequent craniofacial feature.
  phenotype_term:
    preferred_term: large fleshy ears
    term:
      id: HP:0002265
      label: Large fleshy ears
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0002265 | Large fleshy ears | Frequent (79-30%)"
    explanation: Orphanet records large fleshy ears as frequent.
- category: Hair
  name: Generalized hypertrichosis
  frequency: FREQUENT
  description: Generalized hypertrichosis is a frequent hair phenotype.
  phenotype_term:
    preferred_term: generalized hypertrichosis
    term:
      id: HP:0004554
      label: Generalized hypertrichosis
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0004554 | Generalized hypertrichosis | Frequent (79-30%)"
    explanation: Orphanet records generalized hypertrichosis as frequent.
- category: Oral
  name: Anterior open-bite malocclusion
  frequency: FREQUENT
  description: Anterior open-bite malocclusion is a frequent oral/dental feature.
  phenotype_term:
    preferred_term: anterior open-bite malocclusion
    term:
      id: HP:0009102
      label: Anterior open-bite malocclusion
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0009102 | Anterior open-bite malocclusion | Frequent (79-30%)"
    explanation: Orphanet records anterior open-bite malocclusion as frequent.
- category: Ear
  name: Thickened ears
  frequency: FREQUENT
  description: Thickened ears are a frequent craniofacial feature.
  phenotype_term:
    preferred_term: thickened ears
    term:
      id: HP:0009894
      label: Thickened ears
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0009894 | Thickened ears | Frequent (79-30%)"
    explanation: Orphanet records thickened ears as frequent.
- category: Oral
  name: Macroglossia
  frequency: OCCASIONAL
  description: Macroglossia is an occasional oral feature.
  phenotype_term:
    preferred_term: macroglossia
    term:
      id: HP:0000158
      label: Macroglossia
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000158 | Macroglossia | Occasional (29-5%)"
    explanation: Orphanet records macroglossia as occasional.
- category: Oral
  name: Cleft palate
  frequency: OCCASIONAL
  description: Cleft palate is an occasional palatal feature.
  phenotype_term:
    preferred_term: cleft palate
    term:
      id: HP:0000175
      label: Cleft palate
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000175 | Cleft palate | Occasional (29-5%)"
    explanation: Orphanet records cleft palate as occasional.
- category: Oral
  name: Bifid uvula
  frequency: OCCASIONAL
  description: Bifid uvula is an occasional palatal feature.
  phenotype_term:
    preferred_term: bifid uvula
    term:
      id: HP:0000193
      label: Bifid uvula
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000193 | Bifid uvula | Occasional (29-5%)"
    explanation: Orphanet records bifid uvula as occasional.
- category: Oral
  name: High palate
  frequency: OCCASIONAL
  description: High palate is an occasional palatal feature.
  phenotype_term:
    preferred_term: high palate
    term:
      id: HP:0000218
      label: High palate
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000218 | High palate | Occasional (29-5%)"
    explanation: Orphanet records high palate as occasional.
- category: Craniofacial
  name: Hypertelorism
  frequency: OCCASIONAL
  description: Hypertelorism is an occasional craniofacial feature.
  phenotype_term:
    preferred_term: hypertelorism
    term:
      id: HP:0000316
      label: Hypertelorism
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000316 | Hypertelorism | Occasional (29-5%)"
    explanation: Orphanet records hypertelorism as occasional.
- category: Craniofacial
  name: Micrognathia
  frequency: OCCASIONAL
  description: Micrognathia is an occasional jaw feature.
  phenotype_term:
    preferred_term: micrognathia
    term:
      id: HP:0000347
      label: Micrognathia
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000347 | Micrognathia | Occasional (29-5%)"
    explanation: Orphanet records micrognathia as occasional.
- category: Craniofacial
  name: Short neck
  frequency: OCCASIONAL
  description: Short neck is an occasional craniofacial feature.
  phenotype_term:
    preferred_term: short neck
    term:
      id: HP:0000470
      label: Short neck
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000470 | Short neck | Occasional (29-5%)"
    explanation: Orphanet records short neck as occasional.
- category: Ocular
  name: Downslanted palpebral fissures
  frequency: OCCASIONAL
  description: Downslanted palpebral fissures are occasional ocular-adnexal features.
  phenotype_term:
    preferred_term: downslanted palpebral fissures
    term:
      id: HP:0000494
      label: Downslanted palpebral fissures
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000494 | Downslanted palpebral fissures | Occasional (29-5%)"
    explanation: Orphanet records downslanted palpebral fissures as occasional.
- category: Ocular
  name: Telecanthus
  frequency: OCCASIONAL
  description: Telecanthus is an occasional ocular-adnexal feature.
  phenotype_term:
    preferred_term: telecanthus
    term:
      id: HP:0000506
      label: Telecanthus
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000506 | Telecanthus | Occasional (29-5%)"
    explanation: Orphanet records telecanthus as occasional.
- category: Ocular
  name: Cataract
  frequency: OCCASIONAL
  description: Cataract is an occasional ocular feature.
  phenotype_term:
    preferred_term: cataract
    term:
      id: HP:0000518
      label: Cataract
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000518 | Cataract | Occasional (29-5%)"
    explanation: Orphanet records cataract as occasional.
- category: Craniofacial
  name: Long eyelashes
  frequency: OCCASIONAL
  description: Long eyelashes are an occasional craniofacial hair feature.
  phenotype_term:
    preferred_term: long eyelashes
    term:
      id: HP:0000527
      label: Long eyelashes
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000527 | Long eyelashes | Occasional (29-5%)"
    explanation: Orphanet records long eyelashes as occasional.
- category: Craniofacial
  name: Thick eyebrow
  frequency: OCCASIONAL
  description: Thick eyebrow is an occasional craniofacial hair feature.
  phenotype_term:
    preferred_term: thick eyebrow
    term:
      id: HP:0000574
      label: Thick eyebrow
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000574 | Thick eyebrow | Occasional (29-5%)"
    explanation: Orphanet records thick eyebrow as occasional.
- category: Oral
  name: Hypodontia
  frequency: OCCASIONAL
  description: Hypodontia is an occasional dental feature.
  phenotype_term:
    preferred_term: hypodontia
    term:
      id: HP:0000668
      label: Hypodontia
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000668 | Hypodontia | Occasional (29-5%)"
    explanation: Orphanet records hypodontia as occasional.
- category: Genitourinary
  name: Abnormal external genitalia
  frequency: OCCASIONAL
  description: Abnormal external genitalia are reported occasionally.
  phenotype_term:
    preferred_term: abnormal external genitalia
    term:
      id: HP:0000811
      label: Abnormal external genitalia morphology
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000811 | Abnormal external genitalia | Occasional (29-5%)"
    explanation: Orphanet records abnormal external genitalia as occasional.
- category: Dermatologic
  name: Soft skin
  frequency: OCCASIONAL
  description: Soft skin is reported occasionally.
  phenotype_term:
    preferred_term: soft skin
    term:
      id: HP:0000977
      label: Soft skin
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000977 | Soft skin | Occasional (29-5%)"
    explanation: Orphanet records soft skin as occasional.
- category: Neurologic
  name: Seizure
  frequency: OCCASIONAL
  description: Seizures are an occasional neurologic feature.
  phenotype_term:
    preferred_term: seizure
    term:
      id: HP:0001250
      label: Seizure
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001250 | Seizure | Occasional (29-5%)"
    explanation: Orphanet records seizure as occasional.
  - reference: PMID:23994350
    reference_title: Clinical and genetic study of two patients with Zimmermann-Laband syndrome and literature review.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Tabulation of clinical features confirmed the core phenotype and identified developmental delay as the unique major clinical problem (occurring in 40% of the cases) with a moderately high risk of epilepsy (13%)."
    explanation: Literature review reports epilepsy in 13% of reviewed cases, consistent with occasional frequency.
- category: Growth
  name: Growth delay
  frequency: OCCASIONAL
  description: Growth delay is reported occasionally.
  phenotype_term:
    preferred_term: growth delay
    term:
      id: HP:0001510
      label: Growth delay
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001510 | Growth delay | Occasional (29-5%)"
    explanation: Orphanet records growth delay as occasional.
- category: Abdominal
  name: Splenomegaly
  frequency: OCCASIONAL
  description: Splenomegaly is reported occasionally.
  phenotype_term:
    preferred_term: splenomegaly
    term:
      id: HP:0001744
      label: Splenomegaly
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001744 | Splenomegaly | Occasional (29-5%)"
    explanation: Orphanet records splenomegaly as occasional.
- category: Musculoskeletal
  name: Pes cavus
  frequency: OCCASIONAL
  description: Pes cavus is reported occasionally.
  phenotype_term:
    preferred_term: pes cavus
    term:
      id: HP:0001761
      label: Pes cavus
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001761 | Pes cavus | Occasional (29-5%)"
    explanation: Orphanet records pes cavus as occasional.
- category: Musculoskeletal
  name: Pes planus
  frequency: OCCASIONAL
  description: Pes planus is reported occasionally.
  phenotype_term:
    preferred_term: pes planus
    term:
      id: HP:0001763
      label: Pes planus
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001763 | Pes planus | Occasional (29-5%)"
    explanation: Orphanet records pes planus as occasional.
- category: Musculoskeletal
  name: Hallux valgus
  frequency: OCCASIONAL
  description: Hallux valgus is reported occasionally.
  phenotype_term:
    preferred_term: hallux valgus
    term:
      id: HP:0001822
      label: Hallux valgus
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001822 | Hallux valgus | Occasional (29-5%)"
    explanation: Orphanet records hallux valgus as occasional.
- category: Hair
  name: Facial hypertrichosis
  frequency: OCCASIONAL
  description: Facial hypertrichosis is reported occasionally.
  phenotype_term:
    preferred_term: facial hypertrichosis
    term:
      id: HP:0002219
      label: Facial hypertrichosis
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0002219 | Facial hypertrichosis | Occasional (29-5%)"
    explanation: Orphanet records facial hypertrichosis as occasional.
- category: Abdominal
  name: Hepatomegaly
  frequency: OCCASIONAL
  description: Hepatomegaly is reported occasionally.
  phenotype_term:
    preferred_term: hepatomegaly
    term:
      id: HP:0002240
      label: Hepatomegaly
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0002240 | Hepatomegaly | Occasional (29-5%)"
    explanation: Orphanet records hepatomegaly as occasional.
- category: Neurologic
  name: Floppy infant
  frequency: OCCASIONAL
  description: Floppy infant is reported occasionally.
  phenotype_term:
    preferred_term: floppy infant
    term:
      id: HP:0008947
      label: Floppy infant
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0008947 | Floppy infant | Occasional (29-5%)"
    explanation: Orphanet records floppy infant as occasional.
- category: Oral
  name: Supernumerary tooth
  frequency: OCCASIONAL
  description: Supernumerary teeth are reported occasionally.
  phenotype_term:
    preferred_term: supernumerary tooth
    term:
      id: HP:0011069
      label: Supernumerary tooth
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0011069 | Supernumerary tooth | Occasional (29-5%)"
    explanation: Orphanet records supernumerary tooth as occasional.
- category: Cardiovascular
  name: Abnormal cardiovascular system morphology
  frequency: OCCASIONAL
  description: Cardiovascular structural abnormalities are reported occasionally.
  phenotype_term:
    preferred_term: abnormal cardiovascular system morphology
    term:
      id: HP:0030680
      label: Abnormal cardiovascular system morphology
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0030680 | Abnormal cardiovascular system morphology | Occasional (29-5%)"
    explanation: Orphanet records abnormal cardiovascular system morphology as occasional.
- category: Oral
  name: Delayed eruption of teeth
  frequency: OCCASIONAL
  description: Gingival fibromatosis may cover crowns and delay tooth eruption.
  phenotype_term:
    preferred_term: delayed eruption of teeth
    term:
      id: HP:0000684
      label: Delayed eruption of teeth
  evidence:
  - reference: PMID:40604848
    reference_title: "Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A common manifestation of these syndromes is gingival fibromatosis, which may partially or completely cover tooth crowns, leading in some cases to functional and aesthetic problems, as well as delayed tooth eruption."
    explanation: The case report and protocol supports delayed tooth eruption as a complication of gingival fibromatosis.
- category: Auditory
  name: Sensorineural hearing impairment
  frequency: VERY_RARE
  description: Sensorineural hearing impairment is reported very rarely.
  phenotype_term:
    preferred_term: sensorineural hearing impairment
    term:
      id: HP:0000407
      label: Sensorineural hearing impairment
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0000407 | Sensorineural hearing impairment | Very rare (<4-1%)"
    explanation: Orphanet records sensorineural hearing impairment as very rare.
- category: Musculoskeletal
  name: Deep plantar creases
  frequency: VERY_RARE
  description: Deep plantar creases are reported very rarely.
  phenotype_term:
    preferred_term: deep plantar creases
    term:
      id: HP:0001869
      label: Deep plantar creases
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0001869 | Deep plantar creases | Very rare (<4-1%)"
    explanation: Orphanet records deep plantar creases as very rare.
- category: Musculoskeletal
  name: Deep palmar crease
  frequency: VERY_RARE
  description: Deep palmar crease is reported very rarely.
  phenotype_term:
    preferred_term: deep palmar crease
    term:
      id: HP:0006191
      label: Deep palmar crease
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0006191 | Deep palmar crease | Very rare (<4-1%)"
    explanation: Orphanet records deep palmar crease as very rare.
- category: Skeletal
  name: Overtubulated long bones
  frequency: VERY_RARE
  description: Overtubulated long bones are reported very rarely.
  phenotype_term:
    preferred_term: overtubulated long bones
    term:
      id: HP:0006391
      label: Overtubulated long bones
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0006391 | Overtubulated long bones | Very rare (<4-1%)"
    explanation: Orphanet records overtubulated long bones as very rare.
- category: Dermatologic
  name: Generalized hyperpigmentation
  frequency: VERY_RARE
  description: Generalized hyperpigmentation is reported very rarely.
  phenotype_term:
    preferred_term: generalized hyperpigmentation
    term:
      id: HP:0007440
      label: Generalized hyperpigmentation
  evidence:
  - reference: ORPHA:3473
    reference_title: Zimmermann-Laband syndrome (Orphanet structured-database record)
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "HP:0007440 | Generalized hyperpigmentation | Very rare (<4-1%)"
    explanation: Orphanet records generalized hyperpigmentation as very rare.
diagnosis:
- name: Clinical syndrome recognition
  description: >
    Clinical recognition is based on the combination of gingival fibromatosis,
    coarse facial appearance, hypertrichosis, neurodevelopmental involvement,
    and distal nail or phalangeal abnormalities.
  diagnosis_term:
    preferred_term: examination by clinical professional
    term:
      id: MAXO:0000526
      label: examination by clinical professional
  evidence:
  - reference: PMID:25915598
    reference_title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Zimmermann-Laband syndrome (ZLS) is a developmental disorder characterized by facial dysmorphism with gingival enlargement, intellectual disability, hypoplasia or aplasia of nails and terminal phalanges, and hypertrichosis."
    explanation: The molecular genetics paper summarizes the core clinical-recognition pattern.
- name: Molecular genetic testing
  description: >
    Sequencing can identify pathogenic variants in KCNH1, KCNN3, or ATP6V1B2
    and distinguish ZLS from overlapping potassium-channel dysmorphism syndromes.
  diagnosis_term:
    preferred_term: genetic testing
    term:
      id: MAXO:0000127
      label: genetic testing
  evidence:
  - reference: PMID:39087232
    reference_title: "Clinical and genetic evaluations of Zimmermann-Laband syndrome with gingival fibromatosis: a rare case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A novel pathogenic variant in the KCNH1 gene was identified using whole-exome sequencing to substantiate our preliminary diagnosis."
    explanation: Whole-exome sequencing confirmed a KCNH1 pathogenic variant after clinical suspicion of ZLS.
treatments:
- name: Gingivectomy and gingivoplasty for gingival fibromatosis
  description: >
    Surgical removal and reshaping of hyperplastic gingiva can expose teeth,
    improve occlusion, restore dental function, and improve oral aesthetics.
  treatment_term:
    preferred_term: surgical procedure
    term:
      id: MAXO:0000004
      label: surgical procedure
  target_phenotypes:
  - preferred_term: gingival fibromatosis
    term:
      id: HP:0000169
      label: Gingival fibromatosis
  - preferred_term: delayed eruption of teeth
    term:
      id: HP:0000684
      label: Delayed eruption of teeth
  evidence:
  - reference: PMID:39087232
    reference_title: "Clinical and genetic evaluations of Zimmermann-Laband syndrome with gingival fibromatosis: a rare case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Gingivectomy and gingivoplasty were performed under general anesthesia. After surgery, the gingival appearance improved significantly, and the masticatory function of the teeth was restored."
    explanation: A ZLS case report documents functional improvement after gingivectomy and gingivoplasty.
  - reference: PMID:40604848
    reference_title: "Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "This case illustrates the need for appropriate and early gingivoplasty to prevent teeth impaction and restore dental function."
    explanation: The proposed protocol supports early gingivoplasty for gingival fibromatosis-associated tooth impaction and dental dysfunction.
- name: Myofunctional and speech-language oral therapy
  description: >
    Myofunctional and speech-language therapy may support biting, chewing, and
    tongue-function rehabilitation before or alongside surgical exposure of
    submerged teeth.
  treatment_term:
    preferred_term: supportive care
    term:
      id: MAXO:0000950
      label: supportive care
  target_phenotypes:
  - preferred_term: delayed eruption of teeth
    term:
      id: HP:0000684
      label: Delayed eruption of teeth
  evidence:
  - reference: PMID:40604848
    reference_title: "Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The first step of oral treatment consisted of myofunctional and speech/language therapy to stimulate biting and chewing. It also helped with the rehabilitation of proper tongue function."
    explanation: The case protocol supports supportive oral therapy to improve biting, chewing, and tongue function.
notes: >
  Orphanet records autosomal recessive inheritance, but molecular literature
  supports de novo or autosomal-dominant inheritance for KCNH1 and KCNN3-related
  disease. This entry follows the molecularly solved, dominant potassium-channel
  and ATP6V1B2 genetic heterogeneity while retaining the ORPHA structured record
  for phenotype coverage. Temple-Baraitser syndrome and KCNK4-related FHEIG
  syndrome overlap clinically with ZLS and may be considered in differential
  diagnosis.
references:
- reference: ORPHA:3473
  title: Zimmermann-Laband syndrome
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:23994350
  title: Clinical and genetic study of two patients with Zimmermann-Laband syndrome and literature review.
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:25915598
  title: Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:31155282
  title: Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:33594261
  title: "Syndromic disorders caused by gain-of-function variants in KCNH1, KCNK4, and KCNN3-a subgroup of K(+) channelopathies."
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:35639255
  title: Potassium Channel KCNH1 Activating Variants Cause Altered Functional and Morphological Ciliogenesis.
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:39087232
  title: "Clinical and genetic evaluations of Zimmermann-Laband syndrome with gingival fibromatosis: a rare case report."
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
- reference: PMID:40604848
  title: "Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol."
  found_in:
  - Zimmermann_Laband_Syndrome-deep-research-fallback.md
  findings: []
📚

References & Deep Research

References

8
ORPHA:3473
Zimmermann-Laband syndrome
No top-level findings curated for this source.
PMID:23994350
Clinical and genetic study of two patients with Zimmermann-Laband syndrome and literature review.
No top-level findings curated for this source.
PMID:25915598
Mutations in KCNH1 and ATP6V1B2 cause Zimmermann-Laband syndrome.
No top-level findings curated for this source.
PMID:31155282
Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca(2+)-Activated K(+) Channel SK3 Cause Zimmermann-Laband Syndrome.
No top-level findings curated for this source.
PMID:33594261
Syndromic disorders caused by gain-of-function variants in KCNH1, KCNK4, and KCNN3-a subgroup of K(+) channelopathies.
No top-level findings curated for this source.
PMID:35639255
Potassium Channel KCNH1 Activating Variants Cause Altered Functional and Morphological Ciliogenesis.
No top-level findings curated for this source.
PMID:39087232
Clinical and genetic evaluations of Zimmermann-Laband syndrome with gingival fibromatosis: a rare case report.
No top-level findings curated for this source.
PMID:40604848
Syndromic gingival fibromatosis associated with pathogenic variation in the voltage-gated potassium channel gene KCNH1: a case report and proposed treatment protocol.
No top-level findings curated for this source.

Deep Research

1
Zimmermann-Laband Syndrome Deep-Research Fallback ▸

Zimmermann-Laband Syndrome Deep-Research Fallback

An automated deep-research provider was attempted after the initial cache-backed YAML existed, but it stayed silent and was stopped by the bounded timeout:

  • timeout 120s just research-disorder openai Zimmermann_Laband_Syndrome returned 124.

The curation therefore used generated local caches plus direct PubMed searches and fetched PubMed/Orphanet records. The reviewed disease scope is Zimmermann-Laband syndrome as represented by ORPHA:3473 and MONDO:0000200, including the molecularly solved KCNH1, KCNN3, and ATP6V1B2 genetic heterogeneity.

Scope Confirmation

  • ORPHA:3473 supplied the definition, neonatal onset, cross-references, gene-disease rows, epidemiology, and all HPO phenotype rows.
  • PMID:23994350 supplied the clinical literature review, developmental-delay and epilepsy frequencies, and inheritance interpretation.
  • PMID:25915598 supplied the KCNH1 gain-of-function mechanism, ATP6V1B2 recurrent de novo variation, and the core clinical feature summary.
  • PMID:31155282 supplied KCNN3 de novo variants and patch-clamp gain-of-function evidence.
  • PMID:33594261 supplied the broader syndromic neurodevelopmental potassium channelopathy framing for KCNH1/KCNN3-related disease.
  • PMID:35639255 supplied KCNH1 ciliary localization and ciliogenesis/Sonic Hedgehog signaling perturbation evidence.
  • PMID:39087232 and PMID:40604848 supplied oral-management evidence for gingival fibromatosis, delayed tooth eruption, gingivectomy, gingivoplasty, and supportive myofunctional/speech-language oral therapy.

Coverage Notes

The YAML intentionally models the most evidence-backed mechanisms as a compact pathograph: increased K+ conductance, ATP6V1B2 V-ATPase complex perturbation, KCNH1-related ciliary signaling disruption, neurodevelopmental dysfunction, gingival/dental overgrowth, and distal digital/nail developmental abnormality. Temple-Baraitser syndrome and KCNK4-related FHEIG overlap clinically, but they are kept as differential/overlap notes rather than merged into the ZLS disease entry.