Bilateral striopallidodentate calcinosis (BSPDC), commonly discussed in recent literature as primary familial brain calcification (PFBC), is a genetically heterogeneous cerebral microvascular calcification disorder defined by bilateral calcium phosphate deposition in the basal ganglia and other brain regions including the dentate nuclei, thalamus, cerebellum, and subcortical white matter. The spectrum includes autosomal dominant and autosomal recessive forms caused by defects in phosphate transport and neurovascular-unit homeostasis, with age-dependent penetrance and wide clinical variation ranging from incidental imaging findings to parkinsonism, cognitive impairment, psychosis, seizures, and other movement disorders.
Ask a research question about Bilateral Striopallidodentate Calcinosis. OpenScientist will conduct autonomous deep research using the Disorder Mechanisms Knowledge Base and PubMed literature (typically 10-30 minutes).
Do not include personal health information in your question. Questions and results are cached in your browser's local storage.
name: Bilateral Striopallidodentate Calcinosis
creation_date: "2026-04-14T08:30:00Z"
category: Mendelian
description: >-
Bilateral striopallidodentate calcinosis (BSPDC), commonly discussed in
recent literature as primary familial brain calcification (PFBC), is a
genetically heterogeneous cerebral microvascular calcification disorder
defined by bilateral calcium phosphate deposition in the basal ganglia and
other brain regions including the dentate nuclei, thalamus, cerebellum, and
subcortical white matter. The spectrum includes autosomal dominant and
autosomal recessive forms caused by defects in phosphate transport and
neurovascular-unit homeostasis, with age-dependent penetrance and wide
clinical variation ranging from incidental imaging findings to parkinsonism,
cognitive impairment, psychosis, seizures, and other movement disorders.
disease_term:
preferred_term: bilateral striopallidodentate calcinosis
term:
id: MONDO:0008947
label: bilateral striopallidodentate calcinosis
parents:
- Basal Ganglia Disorder
- Neurodegenerative Disease
- Hereditary Neurological Disease
synonyms:
- BSPDC
- PFBC
- Primary Familial Brain Calcification
- primary familial brain calcification
- idiopathic basal ganglia calcification
- Fahr disease
mappings:
mondo_mappings:
- term:
id: MONDO:0024538
label: basal ganglia calcification, idiopathic, 1
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
MONDO splits this disease into one numbered `basal ganglia calcification,
idiopathic, N` leaf per causal gene, each a direct child of MONDO:0008947
and each defined only as "any bilateral striopallidodentate calcinosis in
which the cause is a mutation in <gene>". This entry curates the whole
dominant and recessive spectrum at the root term instead, with the
per-gene detail in `genetic:` (see `notes:` for why). The nine gene-defined
leaves are therefore declared here as narrowMatch mappings rather than as
`has_subtypes` rows, which would duplicate the `genetic:` section without
adding a mechanism. IBGC1 is the SLC20A2 leaf; its `genetic:` record is
`SLC20A2`.
- term:
id: MONDO:0014004
label: basal ganglia calcification, idiopathic, 4
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC4, the PDGFRB leaf; curated here as the `PDGFRB` `genetic:` record.
See the MONDO:0024538 justification for why the gene-defined leaves are
mappings rather than subtype rows.
- term:
id: MONDO:0014204
label: basal ganglia calcification, idiopathic, 5
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC5, the PDGFB leaf; curated here as the `PDGFB` `genetic:` record.
- term:
id: MONDO:0014628
label: basal ganglia calcification, idiopathic, 6
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC6, the XPR1 leaf; curated here as the `XPR1` `genetic:` record.
- term:
id: MONDO:0032673
label: basal ganglia calcification, idiopathic, 7, autosomal recessive
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC7, the MYORG leaf; curated here as the `MYORG` `genetic:` record.
- term:
id: MONDO:0032938
label: basal ganglia calcification, idiopathic, 8, autosomal recessive
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC8, the JAM2 leaf; curated here as the `JAM2` `genetic:` record.
- term:
id: MONDO:0968977
label: basal ganglia calcification, idiopathic, 9, autosomal recessive
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC9, the NAA60 leaf; curated here as the `NAA60` `genetic:` record.
- term:
id: MONDO:0975875
label: basal ganglia calcification, idiopathic, 10, autosomal recessive
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC10, the CMPK2 leaf; curated here as the `CMPK2` `genetic:` record and
the `Neuronal and endothelial mitochondrial dysfunction` pathophysiology
node.
- term:
id: MONDO:0980939
label: basal ganglia calcification, idiopathic, 11, autosomal recessive
mapping_predicate: skos:narrowMatch
mapping_source: MONDO
mapping_justification: >-
IBGC11, the RRP12 leaf; curated here as the `RRP12` `genetic:` record,
which types the relationship as a declared candidate rather than as
established, following the founding report's own wording.
references:
- reference: PMID:20301594
title: Primary Familial Brain Calcification Overview.
tags:
- GeneReviews
notes: >-
This entry is intentionally curated at the disease/root level for
MONDO:0008947 rather than split into multiple premature gene-specific pages.
The page captures the dominant and recessive BSPDC/PFBC spectrum in one
place, with subtype heterogeneity documented under `has_subtypes` and
gene-level heterogeneity documented under `genetic`. The current
PMID-supported core gene set curated here is SLC20A2, XPR1, PDGFRB, PDGFB,
MYORG, JAM2, NAA60, CMPK2, and RRP12. Secondary causes of basal ganglia
calcification are outside scope for this disease-level entry.
Each of those nine genes has its own numbered MONDO leaf below MONDO:0008947
(`basal ganglia calcification, idiopathic, 1` and `4` through `11`), and each
leaf is declared in `mappings.mondo_mappings` as a `skos:narrowMatch` rather
than turned into a `has_subtypes` row. The reason is that a MONDO leaf here
carries no clinical content of its own - its definition is just "any bilateral
striopallidodentate calcinosis in which the cause is a mutation in <gene>" -
so a subtype row per leaf would restate the `genetic:` section under a second
heading. The two `has_subtypes` rows that do exist split the spectrum the way
the literature does, by inheritance, which is the axis that carries a
phenotype difference (heavier calcification burden in the recessive forms).
Two further MONDO descendants of this term carry no causal-gene edge and so
have nothing to curate genetically: MONDO:0007247 (`basal ganglia
calcification, idiopathic, childhood-onset`, OMIM:114100, whose own MONDO
definition reads "Not in the OMIM series."). The IBGC2 and IBGC3 designations
are not separate terms at all: MONDO:0024538 carries `IBGC2` and `basal ganglia
calcification, idiopathic, 2` as exact synonyms, the latter cross-referenced to
the merged term MONDO:0011692, and `basal ganglia calcification, idiopathic, 3`
as a related synonym cross-referenced to OMIM:213600, the same OMIM entry the
IBGC1 leaf itself carries.
The GeneReviews chapter `Primary Familial Brain Calcification Overview`
(PMID:20301594) is tagged in `references:` as the mandatory baseline, but no
evidence item quotes it: its PubMed record contains only the chapter's
five-point statement of scope, with no clinical or genetic finding in it. The
chapter text itself is served from an NCBI Bookshelf URL, and dismech#12747
reports that those URLs were returning a bot-detection interstitial rather
than chapter content around the time this entry was revised, so it was not
fetched.
has_subtypes:
- name: Autosomal Dominant PFBC
classification: inheritance
description: >-
Dominant BSPDC/PFBC is most often caused by pathogenic variants in SLC20A2,
XPR1, PDGFRB, or PDGFB and shows age-dependent, variably expressive motor,
cognitive, and neuropsychiatric disease.
evidence:
- reference: PMID:29955172
reference_title: "Primary brain calcification: an international study reporting novel variants and associated phenotypes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "It is typically inherited as an autosomal-dominant trait with four causative genes identified so far: SLC20A2, PDGFRB, PDGFB, and XPR1."
explanation: Defines the dominant PFBC subgroup and its core genes.
- name: Autosomal Recessive PFBC
classification: inheritance
description: >-
Recessive BSPDC/PFBC includes MYORG-, JAM2-, NAA60- and CMPK2-associated
disease and tends to have heavier calcification burden and more severe
neurologic involvement than the dominant forms. RRP12 is a further recessive
locus, reported biallelic in four families, that its founding authors
describe as a candidate rather than as established; see the `RRP12`
`genetic:` record.
evidence:
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Compared with patients with autosomal dominant primary familial brain calcification, patients with the recessive form of the disease present with more severe clinical and imaging phenotypes, and deserve more clinical and research attention."
explanation: Supports recessive PFBC as a clinically more severe subtype grouping.
- reference: PMID:38480682
reference_title: "Biallelic NAA60 variants with impaired n-terminal acetylation capacity cause autosomal recessive primary familial brain calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we identify biallelic NAA60 variants in ten individuals from seven families with autosomal recessive PFBC."
explanation: Confirms that autosomal recessive PFBC extends beyond MYORG and JAM2.
- reference: PMID:37446066
reference_title: "The Genetics of Primary Familial Brain Calcification: A Literature Review."
supports: SUPPORT
evidence_source: OTHER
snippet: "Hitherto, seven genes have been associated with PFBC, including four dominant inherited genes (SLC20A2, PDGFRB, PDGFB, and XPR1) and three recessive inherited genes (MYORG, JAM2, and CMPK2)."
explanation: >-
Places CMPK2 in the recessive group alongside MYORG and JAM2, which is the
membership claim this subtype row makes. The review predates the NAA60 and
RRP12 reports, so its count of seven is the count at the time and not a
statement that no further gene exists.
progression:
- phase: Variable onset and age-dependent expressivity
notes: >-
Symptoms may begin in childhood or late adulthood, and some genetically
affected individuals remain asymptomatic despite calcifications on imaging.
evidence:
- reference: PMID:29955172
reference_title: "Primary brain calcification: an international study reporting novel variants and associated phenotypes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Primary familial brain calcification (PFBC) is a rare cerebral microvascular calcifying
disorder with a wide spectrum of motor, cognitive, and neuropsychiatric symptoms. ... Our
study aimed at screening the coding regions of these genes in a series of 177 unrelated
probands that fulfilled the diagnostic criteria for primary brain calcification regardless of
their family history. ... We identified 45 probands (25.4%) carrying either pathogenic or
likely pathogenic variants (n = 34, 19.2%) or VUS (n = 11, 6.2%). ... A total of 81.5% of
carriers were symptomatic and the most recurrent symptoms were parkinsonism, cognitive
impairment, and psychiatric disturbances (52.3%, 40.9%, and 38.6% of symptomatic individuals,
respectively), with a wide range of age at onset (from childhood to 81 years).
explanation: >-
Identifies primary familial brain calcification and variable onset, retaining the distinction
between pathogenic/likely pathogenic variants and variants of uncertain significance.
inheritance:
- name: Autosomal dominant inheritance
inheritance_term:
preferred_term: Autosomal dominant inheritance
term:
id: HP:0000006
label: Autosomal dominant inheritance
description: >-
Dominant disease accounts for the traditional PFBC families driven mainly
by SLC20A2, XPR1, PDGFRB, and PDGFB.
evidence:
- reference: PMID:29955172
reference_title: "Primary brain calcification: an international study reporting novel variants and associated phenotypes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "It is typically inherited as an autosomal-dominant trait with four causative genes identified so far: SLC20A2, PDGFRB, PDGFB, and XPR1."
explanation: Establishes autosomal dominant inheritance for the classical PFBC subgroup.
- name: Autosomal recessive inheritance
inheritance_term:
preferred_term: Autosomal recessive inheritance
term:
id: HP:0000007
label: Autosomal recessive inheritance
description: >-
Recessive BSPDC/PFBC now includes MYORG-, JAM2-, and NAA60-associated
disease with biallelic pathogenic variants.
evidence:
- reference: PMID:38480682
reference_title: "Biallelic NAA60 variants with impaired n-terminal acetylation capacity cause autosomal recessive primary familial brain calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we identify biallelic NAA60 variants in ten individuals from seven families with autosomal recessive PFBC."
explanation: Confirms autosomal recessive inheritance as part of the PFBC spectrum.
genetic:
- name: SLC20A2
gene_term:
preferred_term: SLC20A2
term:
id: hgnc:10947
label: SLC20A2
association: Causative
relationship_type: CAUSATIVE
features: >-
SLC20A2 encodes the PiT-2 inorganic phosphate importer and is the major
cause of autosomal dominant PFBC. Loss of expression or regulatory
haploinsufficiency lowers phosphate uptake and promotes phosphate
dysregulation in brain microvascular tissue.
inheritance:
- name: Autosomal Dominant
evidence:
- reference: PMID:32506582
reference_title: "Haploinsufficiency of the Primary Familial Brain Calcification Gene SLC20A2 Mediated by Disruption of a Regulatory Element."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Haploinsufficiency of SLC20A2, which encodes an inorganic phosphate importer, is a major cause of autosomal-dominant PFBC."
explanation: Establishes SLC20A2 as the major dominant phosphate-import gene in PFBC.
- name: XPR1
gene_term:
preferred_term: XPR1
term:
id: hgnc:12827
label: XPR1
association: Causative
relationship_type: CAUSATIVE
features: >-
XPR1 encodes a phosphate exporter. Pathogenic dominant variants impair
phosphate efflux and reinforce phosphate homeostasis as a central disease
axis in BSPDC/PFBC.
inheritance:
- name: Autosomal Dominant
evidence:
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "These mutations alter phosphate export, implicating XPR1 and phosphate homeostasis in PFBC."
explanation: Directly links dominant XPR1 variants to PFBC through altered phosphate export.
- name: PDGFRB
gene_term:
preferred_term: PDGFRB
term:
id: hgnc:8804
label: PDGFRB
association: Causative
relationship_type: CAUSATIVE
features: >-
PDGFRB encodes the platelet-derived growth factor receptor beta. Reduced
receptor function implicates pericyte biology, angiogenic signaling, and
phosphate-regulatory neurovascular pathways in PFBC.
inheritance:
- name: Autosomal Dominant
evidence:
- reference: PMID:23255827
reference_title: "Mutation of the PDGFRB gene as a cause of idiopathic basal ganglia calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Mutations of PDGFRB further support the involvement of this biological pathway in IBGC pathophysiology."
explanation: Supports PDGFRB as a causative dominant PFBC gene linked to the shared pathway.
- name: PDGFB
gene_term:
preferred_term: PDGFB
term:
id: hgnc:8800
label: PDGFB
association: Causative
relationship_type: CAUSATIVE
features: >-
PDGFB is the major ligand for PDGFRB. Endothelial PDGF-B loss is linked to
pericyte deficiency, blood-brain barrier compromise, and brain
calcification.
inheritance:
- name: Autosomal Dominant
evidence:
- reference: PMID:23913003
reference_title: "Mutations in the gene encoding PDGF-B cause brain calcifications in humans and mice."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here we identify six families of different ancestry with nonsense and missense mutations in the gene encoding PDGF-B, the main ligand for PDGF-Rฮฒ."
explanation: Establishes PDGFB as a dominant PFBC gene in affected human families.
- name: MYORG
gene_term:
preferred_term: MYORG
term:
id: hgnc:19918
label: MYORG
association: Causative
relationship_type: CAUSATIVE
features: >-
MYORG encodes an astrocyte-associated glycosidase-family protein and causes
recessive PFBC. Current evidence links MYORG-associated disease to
neurovascular signaling pathways related to PDGFRB biology.
inheritance:
- name: Autosomal Recessive
evidence:
- reference: PMID:30656188
reference_title: "MYORG is associated with recessive primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "MYORG mutations are linked to a recessive form of primary familial brain calcification."
explanation: Establishes MYORG as a recessive PFBC gene.
- reference: PMID:30656188
reference_title: "MYORG is associated with recessive primary familial brain calcification."
supports: SUPPORT
evidence_source: COMPUTATIONAL
snippet: "the MYORG protein may interact with calcium channels expressed in astrocytes"
explanation: Phylogenetic-profiling analysis links MYORG to astrocyte calcium channels and to PDGFRB-interacting proteins, connecting recessive MYORG disease to the shared neurovascular PFBC pathway.
- name: JAM2
gene_term:
preferred_term: JAM2
term:
id: hgnc:14686
label: JAM2
association: Causative
relationship_type: CAUSATIVE
features: >-
JAM2 encodes a junctional adhesion protein enriched in neurovascular-unit
cell types. Biallelic loss disrupts cell-cell adhesion and neurovascular
integrity in severe recessive PFBC.
inheritance:
- name: Autosomal Recessive
evidence:
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Our study identifies a novel causative gene for primary familial brain calcification, whose vital function and high expression in the neurovascular unit further supports impairment of the neurovascular unit as the root of primary familial brain calcification pathogenesis."
explanation: Establishes JAM2 as a recessive PFBC gene and ties it to neurovascular pathology.
- name: NAA60
gene_term:
preferred_term: NAA60
term:
id: hgnc:25875
label: NAA60
association: Causative
relationship_type: CAUSATIVE
features: >-
NAA60 encodes a Golgi-localized N-terminal acetyltransferase. Recessive
loss of NAA60 impairs transmembrane-protein acetylation, lowers cell-surface
SLC20A2, and reduces phosphate uptake.
inheritance:
- name: Autosomal Recessive
evidence:
- reference: PMID:38480682
reference_title: "Biallelic NAA60 variants with impaired n-terminal acetylation capacity cause autosomal recessive primary familial brain calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "This study establishes NAA60 as a causal gene for PFBC, provides a possible biochemical explanation of its disease-causing mechanisms and underscores NAA60-mediated Nt-acetylation of transmembrane proteins as a fundamental process for healthy neurobiological functioning."
explanation: Establishes NAA60 as a recessive PFBC gene with a defined biochemical mechanism.
- name: CMPK2
gene_term:
preferred_term: CMPK2
term:
id: hgnc:27015
label: CMPK2
association: Causative
relationship_type: CAUSATIVE
features: >-
Biallelic CMPK2 loss of function lowers mitochondrial DNA copy number,
mitochondrial protein abundance and ATP production, and raises intracellular
inorganic phosphate. That is a third mechanistic axis in this disease,
distinct from the phosphate transporters and from the neurovascular-unit
genes, and it is the one this entry models at the `Neuronal and endothelial
mitochondrial dysfunction` node. The cited work characterises the
consequences of losing the gene rather than stating what the protein does, so
no claim about the enzyme's normal substrate is made here.
inheritance:
- name: Autosomal Recessive
evidence:
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we analyzed two brain calcification families and identified calcification co-segregated biallelic variants in the CMPK2 gene that disrupt mitochondrial functions."
explanation: >-
Establishes CMPK2 as a recessive brain-calcification gene on co-segregation
of biallelic variants in two families.
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Notably, calcification developed in a progressive manner in the homozygous Cmpk2-KO mice thalamus region as well as in the Cmpk2-knock-in mice bearing the patient mutation, thus phenocopying the calcification pathology observed in the patients."
explanation: >-
Two independent mouse models - a knockout and a knock-in carrying the
patient allele - reproduce the calcification, which is what raises CMPK2
above a co-segregation observation.
- reference: PMID:37446066
reference_title: "The Genetics of Primary Familial Brain Calcification: A Literature Review."
supports: SUPPORT
evidence_source: OTHER
snippet: "Hitherto, seven genes have been associated with PFBC, including four dominant inherited genes (SLC20A2, PDGFRB, PDGFB, and XPR1) and three recessive inherited genes (MYORG, JAM2, and CMPK2)."
explanation: >-
Independent review counting CMPK2 among the established recessive PFBC
genes, which is the basis for typing it CAUSATIVE rather than as a
candidate.
- name: RRP12
gene_term:
preferred_term: RRP12
term:
id: hgnc:29100
label: RRP12
association: Candidate
relationship_type: UNKNOWN
features: >-
Biallelic RRP12 missense variants were reported in four families with brain
calcification, with reduced RRP12 protein and abnormal nucleolar morphology in
patient fibroblasts. The founding report describes RRP12 as having an
essential role in RNA metabolism, which places the gene on the
nucleic-acid-metabolism axis of brain calcification rather than on the
phosphate-transport or neurovascular-unit axes the other eight genes occupy.
No pathophysiology node is curated for it here, because the reported
functional work establishes that the variants reduce RRP12 protein and
disturb the nucleolus, not how either step reaches calcium-phosphate
deposition; the zebrafish knockdown in that report gave developmental delay,
crimping and early lethality rather than a calcification phenotype.
inheritance:
- name: Autosomal Recessive
notes: >-
`relationship_type: UNKNOWN` with `association: Candidate` follows the
founding report's own conclusion, which calls RRP12 "a novel candidate gene"
rather than an established cause. Four families with biallelic variants and a
protein-level readout is real support, but the two large screening cohorts it
drew on (France n = 111, China n = 543) yielded three further individuals
between them, its own zebrafish knockdown produced developmental delay and
lethality rather than calcification, and the current ClinGen Gene-Disease
Validity table (file created 2026-09-25,
downloaded from the unversioned URL pinned in data/clingen/MANIFEST.yaml)
contains no RRP12 assertion - nor any assertion for the other eight genes on
this entry, so that silence is about the panel's coverage of this disease
rather than about RRP12 specifically.
evidence:
- reference: PMID:41059649
reference_title: "RRP12 Variants Are Associated With Autosomal Recessive Brain Calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Screening of two large cohorts of patients with unresolved brain calcifications revealed two affected French siblings and one unrelated Chinese individual, each carrying rare, biallelic, missense variants in the RRP12 gene"
explanation: >-
The replication beyond the two index Pakistani probands: three further
individuals from two more families, all with biallelic missense variants.
- reference: PMID:41059649
reference_title: "RRP12 Variants Are Associated With Autosomal Recessive Brain Calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "RRP12 is a novel candidate gene for autosomal recessive brain calcifications, possibly associated with a wide clinical spectrum ranging from early-onset severe forms to adult-onset paucisymptomatic presentations."
explanation: >-
The authors' own classification, and the reason this record is typed
UNKNOWN/Candidate rather than CAUSATIVE.
- reference: PMID:41059649
reference_title: "RRP12 Variants Are Associated With Autosomal Recessive Brain Calcifications."
supports: SUPPORT
quote_role: BACKGROUND
evidence_source: OTHER
snippet: "Primary brain calcifications are observed in several inherited diseases due to different pathogenic mechanisms, including the disruption of the neurovascular unit, mitochondrial dysfunction, and impaired nucleic acid metabolism."
explanation: >-
Names the three mechanistic axes of inherited brain calcification, which is
how RRP12 is positioned relative to the other genes on this entry. Marked
BACKGROUND because it is the paper's structured `BACKGROUND:` framing
rather than a result of the study.
biochemical:
- name: Normal serum calcium and phosphate metabolism
presence: NORMAL
context: >-
Primary/idiopathic brain calcification occurs with normal systemic
calcium-phosphate metabolism and normal parathyroid function. Documented
normal serum calcium, phosphate, and parathyroid hormone distinguish primary
familial brain calcification from secondary brain calcification due to
hypoparathyroidism and other metabolic causes, and this exclusion is part of
the diagnostic definition.
evidence:
- reference: PMID:30656188
reference_title: "MYORG is associated with recessive primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "progressive neurological disorder with extensive brain calcification, lacking known metabolic causes such as calcium or phosphorus disorders"
explanation: Defines PFBC by the absence of a calcium/phosphorus metabolic disturbance, the criterion separating primary from secondary brain calcification.
- reference: PMID:39036637
reference_title: "Primary familial brain calcification presenting with parkinsonism and motor complications caused by a novel SLC20A2 variant: a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Laboratory tests revealed normal liver function, electrolyte (including calcium and phosphorus metabolism)"
explanation: A genetically confirmed PFBC case shows normal calcium/phosphorus metabolism and parathyroid hormone, consistent with the primary/idiopathic diagnostic criterion.
pathophysiology:
- name: Disrupted phosphate transport homeostasis
description: >-
SLC20A2 and XPR1 directly regulate inorganic phosphate influx and efflux,
while NAA60 loss secondarily reduces SLC20A2 surface abundance and
phosphate uptake. Together these defects dysregulate phosphate handling in
the brain microvascular environment and promote calcium-phosphate
deposition.
genes:
- preferred_term: SLC20A2
term:
id: hgnc:10947
label: SLC20A2
- preferred_term: XPR1
term:
id: hgnc:12827
label: XPR1
- preferred_term: NAA60
term:
id: hgnc:25875
label: NAA60
biological_processes:
- preferred_term: phosphate ion transmembrane transport
term:
id: GO:0035435
label: phosphate ion transmembrane transport
modifier: DYSREGULATED
locations:
- preferred_term: blood-brain barrier
term:
id: UBERON:0000120
label: blood brain barrier
- preferred_term: basal ganglion
term:
id: UBERON:0002420
label: basal ganglion
evidence:
- reference: PMID:32506582
reference_title: "Haploinsufficiency of the Primary Familial Brain Calcification Gene SLC20A2 Mediated by Disruption of a Regulatory Element."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Haploinsufficiency of SLC20A2, which encodes an inorganic phosphate importer, is a major cause of autosomal-dominant PFBC."
explanation: Supports defective phosphate import as a central dominant PFBC mechanism.
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "These mutations alter phosphate export, implicating XPR1 and phosphate homeostasis in PFBC."
explanation: Supports defective phosphate export as a complementary PFBC mechanism.
- reference: PMID:38480682
reference_title: "Biallelic NAA60 variants with impaired n-terminal acetylation capacity cause autosomal recessive primary familial brain calcifications."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In cells, loss of NAA60 caused reduced surface levels of SLC20A2 and a reduction in extracellular phosphate uptake."
explanation: Shows that NAA60-associated PFBC converges mechanistically on impaired SLC20A2-dependent phosphate uptake.
downstream:
- target: Neurovascular calcium-phosphate deposition
description: Dysregulated phosphate handling favors calcium-phosphate precipitation along deep-brain microvascular structures.
- name: Neuronal and endothelial mitochondrial dysfunction
biological_scale: CELLULAR
description: >-
CMPK2 loss of function depletes mitochondrial DNA and mitochondrial protein
in neurons and vascular endothelial cells, two brain cell types with high
energy expenditure, lowering ATP production, distorting cristae
architecture, and raising intracellular inorganic phosphate. This is a third
initiating axis in this disease, alongside the phosphate transporters and the
neurovascular-unit genes, and it converges on the same deposition step.
genes:
- preferred_term: CMPK2
term:
id: hgnc:27015
label: CMPK2
cell_types:
- preferred_term: neuron
term:
id: CL:0000540
label: neuron
- preferred_term: vascular endothelial cell
term:
id: CL:0002139
label: endothelial cell of vascular tree
biological_processes:
- preferred_term: ATP biosynthetic process
term:
id: GO:0006754
label: ATP biosynthetic process
modifier: DECREASED
- preferred_term: mitochondrion organization
term:
id: GO:0007005
label: mitochondrion organization
modifier: ABNORMAL
locations:
- preferred_term: basal ganglion
term:
id: UBERON:0002420
label: basal ganglion
evidence:
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "In situ hybridization and single-cell RNA sequencing revealed robust Cmpk2 expression in neurons and vascular endothelial cells (vECs), two cell types with high energy expenditure in the brain."
explanation: >-
The basis for the two cell types bound at this node, and for describing them
as the high-energy-demand cells in which a mitochondrial defect would bite
first.
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "The neurons in Cmpk2-knockout (KO) mice have fewer mitochondrial DNA copies, down-regulated mitochondrial proteins, reduced ATP production, and elevated intracellular inorganic phosphate (Pi) level, recapitulating the mitochondrial dysfunction observed in the PBMCs isolated from the FBC patients."
explanation: >-
Supports the decreased ATP biosynthesis bound here, and the elevated
intracellular phosphate that is this node's link to the deposition step.
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Morphologically, the cristae architecture of the Cmpk2-KO murine neurons was also impaired."
explanation: >-
Supports the abnormal mitochondrion organization bound here, as distinct from
the separate quantitative loss of ATP output.
- reference: PMID:37446066
reference_title: "The Genetics of Primary Familial Brain Calcification: A Literature Review."
supports: SUPPORT
evidence_source: OTHER
snippet: "The function of currently known genes suggests that PFBC could be caused by the dysfunction of the neurovascular unit, the dysregulation of phosphate homeostasis, or mitochondrial dysfunction."
explanation: >-
Independent review naming mitochondrial dysfunction as one of the three
mechanisms of this disease, which is why it is modelled as its own node
rather than folded into the phosphate-handling node.
downstream:
- target: Neurovascular calcium-phosphate deposition
description: >-
Failed mitochondrial energy metabolism with raised intracellular inorganic
phosphate in high-demand neurons and vascular endothelial cells favours
calcium-phosphate precipitation at the same deep-brain microvascular sites
the transporter and neurovascular-unit lesions act on.
causal_link_type: DIRECT
evidence:
- reference: PMID:36443312
reference_title: "Loss of function of CMPK2 causes mitochondria deficiency and brain calcification."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Notably, calcification developed in a progressive manner in the homozygous Cmpk2-KO mice thalamus region as well as in the Cmpk2-knock-in mice bearing the patient mutation, thus phenocopying the calcification pathology observed in the patients."
explanation: >-
Connects the mitochondrial lesion to deposition: removing or mutating
Cmpk2 in mouse produces the calcification itself, not only the
mitochondrial phenotype.
- name: Neurovascular calcium-phosphate deposition
description: >-
PFBC-linked PDGFB/PDGFRB and JAM2 defects impair pericyte-endothelial-astrocyte
homeostasis, while related recessive pathways such as MYORG
likely converge on the same neurovascular system. Reduced blood-brain
barrier maintenance and cell-cell adhesion favor vascular and perivascular
brain calcification.
genes:
- preferred_term: PDGFB
term:
id: hgnc:8800
label: PDGFB
- preferred_term: PDGFRB
term:
id: hgnc:8804
label: PDGFRB
- preferred_term: JAM2
term:
id: hgnc:14686
label: JAM2
- preferred_term: MYORG
term:
id: hgnc:19918
label: MYORG
cell_types:
- preferred_term: brain pericyte
term:
id: CL:2000043
label: brain pericyte
- preferred_term: brain microvascular endothelial cell
term:
id: CL:2000044
label: brain microvascular endothelial cell
- preferred_term: astrocyte
term:
id: CL:0000127
label: astrocyte
biological_processes:
- preferred_term: maintenance of blood-brain barrier
term:
id: GO:0035633
label: maintenance of blood-brain barrier
modifier: DECREASED
- preferred_term: cell-cell adhesion
term:
id: GO:0098609
label: cell-cell adhesion
modifier: DECREASED
locations:
- preferred_term: blood-brain barrier
term:
id: UBERON:0000120
label: blood brain barrier
- preferred_term: basal ganglion
term:
id: UBERON:0002420
label: basal ganglion
- preferred_term: dentate nucleus
term:
id: UBERON:0002132
label: dentate nucleus
evidence:
- reference: PMID:23913003
reference_title: "Mutations in the gene encoding PDGF-B cause brain calcifications in humans and mice."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "The occurrence of these calcium depositions depends on the loss of endothelial PDGF-B and correlates with the degree of pericyte and blood-brain barrier deficiency."
explanation: Directly supports neurovascular-unit failure as a cause of brain calcification.
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We speculated that mutant JAM2 protein resulted in impaired cell-cell adhesion functions and reduced integrity of the neurovascular unit."
explanation: Supports tight-junction and neurovascular-unit disruption in recessive PFBC.
downstream:
- target: Intracranial calcification
description: Calcium-phosphate deposition along neurovascular structures manifests radiographically as bilateral intracranial calcifications.
causal_link_type: DIRECT
evidence:
- reference: PMID:23913003
reference_title: "Mutations in the gene encoding PDGF-B cause brain calcifications in humans and mice."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "The occurrence of these calcium depositions depends on the loss of endothelial PDGF-B and correlates with the degree of pericyte and blood-brain barrier deficiency."
explanation: Supports neurovascular PDGF-B/pericyte deficiency as a driver of calcium deposition.
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Primary familial brain calcification is a monogenic disease characterized by bilateral calcifications in the basal ganglia and other brain regions, and commonly presents motor, psychiatric, and cognitive symptoms."
explanation: Supports bilateral intracranial calcification as the clinical/radiographic manifestation of the deposition process.
phenotypes:
- category: Neurological
name: Intracranial calcification
description: >-
Bilateral intracranial calcification involving the basal ganglia and other
deep brain regions is the defining radiographic hallmark of the disorder.
phenotype_term:
preferred_term: Intracranial calcification
term:
id: HP:0430048
label: Intracranial calcification
evidence:
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Primary familial brain calcification is a monogenic disease characterized by bilateral calcifications in the basal ganglia and other brain regions, and commonly presents motor, psychiatric, and cognitive symptoms."
explanation: Supports bilateral intracranial calcification as the core disease phenotype.
- category: Neurological
name: Parkinsonism
description: >-
Parkinsonism is one of the most common symptomatic motor manifestations in
clinically affected BSPDC/PFBC carriers.
phenotype_term:
preferred_term: Parkinsonism
term:
id: HP:0001300
label: Parkinsonism
evidence:
- reference: PMID:29955172
reference_title: "Primary brain calcification: an international study reporting novel variants and associated phenotypes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A total of 81.5% of carriers were symptomatic and the most recurrent symptoms were parkinsonism, cognitive impairment, and psychiatric disturbances (52.3%, 40.9%, and 38.6% of symptomatic individuals, respectively), with a wide range of age at onset (from childhood to 81 years)."
explanation: Quantifies parkinsonism as the leading recurrent motor phenotype in the international cohort.
- category: Neurological
name: Dystonia
description: >-
Dystonia is part of the movement-disorder spectrum reported in PFBC/BSPDC.
phenotype_term:
preferred_term: Dystonia
term:
id: HP:0001332
label: Dystonia
evidence:
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Clinical features include dystonia, parkinsonism, ataxia, psychosis, dementia, chorea, and frontal-subcortical cognitive dysfunction."
explanation: Lists dystonia among recognized clinical features of PFBC.
- category: Neurological
name: Ataxia
description: >-
Ataxia is part of the neurologic movement phenotype in the PFBC/BSPDC
spectrum.
phenotype_term:
preferred_term: Ataxia
term:
id: HP:0001251
label: Ataxia
evidence:
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Clinical features include dystonia, parkinsonism, ataxia, psychosis, dementia, chorea, and frontal-subcortical cognitive dysfunction."
explanation: Lists ataxia among recognized clinical features of PFBC.
- category: Neurological
name: Chorea
description: >-
Chorea is another hyperkinetic movement phenotype reported in PFBC/BSPDC.
phenotype_term:
preferred_term: Chorea
term:
id: HP:0002072
label: Chorea
evidence:
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Clinical features include dystonia, parkinsonism, ataxia, psychosis, dementia, chorea, and frontal-subcortical cognitive dysfunction."
explanation: Lists chorea among recognized clinical features of PFBC.
- category: Neurological
name: Tremor
description: >-
Tremor is among the common motor manifestations in the PFBC/BSPDC
movement-disorder spectrum.
phenotype_term:
preferred_term: Tremor
term:
id: HP:0001337
label: Tremor
evidence:
- reference: PMID:39036637
reference_title: "Primary familial brain calcification presenting with parkinsonism and motor complications caused by a novel SLC20A2 variant: a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "common motor symptoms such as parkinsonism, dystonia, and tremors"
explanation: A 516-patient PFBC series lists tremor among the common motor symptoms of the disorder.
- category: Neurological
name: Headache
description: >-
Headache is reported among the clinical manifestations of PFBC/BSPDC.
phenotype_term:
preferred_term: Headache
term:
id: HP:0002315
label: Headache
evidence:
- reference: PMID:39036637
reference_title: "Primary familial brain calcification presenting with parkinsonism and motor complications caused by a novel SLC20A2 variant: a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "rarer symptoms such as ataxia, seizures, headache, vertigo, and urinary tract symptoms"
explanation: A 516-patient PFBC series lists headache among the reported symptoms of the disorder.
- category: Neurological
name: Cognitive impairment
description: >-
Cognitive impairment is a common symptomatic domain across the BSPDC/PFBC
spectrum.
phenotype_term:
preferred_term: Cognitive impairment
term:
id: HP:0100543
label: Cognitive impairment
evidence:
- reference: PMID:29955172
reference_title: "Primary brain calcification: an international study reporting novel variants and associated phenotypes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A total of 81.5% of carriers were symptomatic and the most recurrent symptoms were parkinsonism, cognitive impairment, and psychiatric disturbances (52.3%, 40.9%, and 38.6% of symptomatic individuals, respectively), with a wide range of age at onset (from childhood to 81 years)."
explanation: Supports cognitive impairment as a core symptomatic domain in PFBC.
- category: Neurological
name: Dementia
description: >-
Dementia can occur within the cognitive decline spectrum of PFBC/BSPDC.
phenotype_term:
preferred_term: Dementia
term:
id: HP:0000726
label: Dementia
evidence:
- reference: PMID:25938945
reference_title: "Mutations in XPR1 cause primary familial brain calcification associated with altered phosphate export."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Clinical features include dystonia, parkinsonism, ataxia, psychosis, dementia, chorea, and frontal-subcortical cognitive dysfunction."
explanation: Lists dementia among recognized clinical features of PFBC.
- category: Psychiatric
name: Psychosis
description: >-
Psychosis can be part of the BSPDC/PFBC phenotype and may occasionally
dominate the initial presentation.
phenotype_term:
preferred_term: Psychosis
term:
id: HP:0000709
label: Psychosis
evidence:
- reference: PMID:23122487
reference_title: "Psychosis revealing familial idiopathic basal ganglia calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Nevertheless, purely psychiatric presentations, as demonstrated by the present case, are possible."
explanation: Supports psychosis as a legitimate presenting phenotype within the PFBC spectrum.
- category: Neurological
name: Dysarthria
subtype: Autosomal Recessive PFBC
description: >-
Dysarthria occurs in the severe recessive PFBC spectrum, including
JAM2-associated disease.
phenotype_term:
preferred_term: Dysarthria
term:
id: HP:0001260
label: Dysarthria
evidence:
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "dysarthria (3/4)"
explanation: Supports dysarthria as a recurrent feature in JAM2-associated recessive PFBC.
- reference: PMID:30656188
reference_title: "MYORG is associated with recessive primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "dysarthria was the most common presenting symptom"
explanation: In MYORG-associated recessive PFBC, dysarthria was the most common presenting symptom, reinforcing dysarthria across the severe recessive spectrum.
- category: Neurological
name: Seizure
subtype: Autosomal Recessive PFBC
description: >-
Seizures occur in a subset of severe recessive PFBC cases, particularly
those with extensive cortical calcification.
phenotype_term:
preferred_term: Seizure
term:
id: HP:0001250
label: Seizure
evidence:
- reference: PMID:31851307
reference_title: "Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The clinical phenotypes of the four patients included parkinsonism (3/4), dysarthria (3/4), seizures (1/4), and probable asymptomatic (1/4), with diverse onset ages."
explanation: Supports seizures as part of the severe recessive JAM2-associated spectrum.
treatments:
- name: Dopaminergic replacement therapy
description: >-
Symptomatic dopaminergic therapy can improve PFBC-associated parkinsonism,
although treatment may require adjustment because motor fluctuations and
dyskinesia can emerge.
treatment_term:
preferred_term: Pharmacotherapy
term:
id: NCIT:C15986
label: Pharmacotherapy
therapeutic_agent:
- preferred_term: levodopa
term:
id: CHEBI:15765
label: L-dopa
target_phenotypes:
- preferred_term: Parkinsonism
term:
id: HP:0001300
label: Parkinsonism
evidence:
- reference: PMID:39036637
reference_title: "Primary familial brain calcification presenting with parkinsonism and motor complications caused by a novel SLC20A2 variant: a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "This example expands the phenotype of SLC20A2-associated PFBC patients and shows the clinical efficacy of dopaminergic replacement treatment."
explanation: Supports symptomatic dopaminergic therapy for PFBC-associated parkinsonism.
- name: Splice-switching antisense oligonucleotide therapy
description: >-
Experimental ASO therapy for SLC20A2 haploinsufficiency restores functional
SLC20A2 expression and suppresses calcification in a humanized mouse model.
treatment_term:
preferred_term: antisense oligonucleotide therapy
term:
id: NCIT:C15986
label: Pharmacotherapy
evidence:
- reference: PMID:39121859
reference_title: "Antisense oligonucleotides enhance SLC20A2 expression and suppress brain calcification in a humanized mouse model."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Together, our findings expand the genetic etiology of PFBC and demonstrate ASO-mediated splice modulation as a potential therapy for PFBC patients with SLC20A2 haploinsufficiency."
explanation: Supports an emerging disease-modifying treatment strategy for SLC20A2-related PFBC in a preclinical model.
Deep research results are used as seeds for research; they do not undergo the same validation as the main records and may contain errors. How we use deep research.
Review: Bilateral Striopallidodentate Calcinosis (Changes required) ยท 2026-05-31T03:01:52Z ยท View source
GitHub review issue: https://github.com/monarch-initiative/dismech/issues/3569 Issue state: OPEN Issue created: 2026-05-31T03:01:52Z Issue updated: 2026-05-31T03:01:52Z Issue closed: not closed Review decision: Changes required Labels: review ## Completed curation review - Disease: **Bilateral Striopallidodentate Calcinosis** - Entry: `kb/disorders/Bilateral_Striopallidodentate_Calcinosis.yaml` - Selection basis: #101 of the least-recently edited Mendelian entries - Review decision: **Changes required** - Validation stance: assumes schema, ontology-term, and reference validation pass; this is a biological/clinical/content review. ## Findings 1. Blocking: the entry has no `diagnosis` section. Add disease-specific diagnostic criteria, recommended tests/imaging/biochemical markers, and molecular confirmation strategy for Bilateral Striopallidodentate Calcinosis; this is necessary for curators to evaluate whether the modeled mechanism and phenotype scope match the intended disease. 2. Research-artifact consumption: matching deep-research artifact(s) exist and should be treated as first-class review inputs. Compare the YAML against the artifact(s), especially for central mechanisms, subtype-specific features, treatments/trials, and diagnostic/surveillance details rather than only schema-valid content. 3. Subtype completeness: `has_subtypes` is present (Autosomal Dominant PFBC, Autosomal Recessive PFBC). Verify that subtype-specific phenotypes, mechanisms, treatments, diagnosis, and genetic contexts are attached to the correct subtype rather than left as broad disease-level claims. 4. Pathophysiology review: the main modeled mechanisms include Disrupted phosphate transport homeostasis, Neurovascular calcium-phosphate deposition. Check that each is an atomic event with direct evidence and that downstream edges do not encode multi-step chains or unsupported causal leaps from gene/product defect to organ-level phenotype. 5. Treatment modeling: treatments are present (Dopaminergic replacement therapy, Splice-switching antisense oligonucleotide therapy). Check therapeutic agents, subtype applicability, evidence strength, and surveillance/supportive-care needs; avoid broad treatment claims that are not tied to the relevant phenotype or disease stage. 6. Evidence/reference check: top references include PMID:29955172, PMID:31851307, PMID:38480682, PMID:32506582. Spot-check that snippets directly support the specific claim, frequency, and evidence_source classification, especially where the same PMID is reused across phenotype, mechanism, and treatment assertions. ## Content-Completeness Checklist - Phenotype coverage: phenotype list needs manual review for disease-defining features. - Subtype completeness: subtypes present; verify subtype-specific anchoring. - Pathophysiology depth: mechanisms present but require atomicity/evidence review. - Treatments and trials: present; verify standard-vs-investigational scope. - Genetics: genetic section present; verify inheritance, variant classes, and genotype-phenotype claims. - Biomarkers/diagnostics: gap noted; diagnosis absent. - References/research consumption: compare the YAML against listed sources and local research artifacts; do not treat retrieval-heavy papers as issues unless they are disease-specific and directly modelable. ## Suggested Remediation Resolve the blocking diagnostic/baseline gaps first, then tighten subtype-specific claims, pathophysiology atomicity, treatment/trial scope, and evidence-to-claim alignment. Keep deterministic schema/term/reference validation separate from this biological review. ## Sources Used - Local research artifact: `research/Bilateral_Striopallidodentate_Calcinosis-deep-research-cyberian-codex.md` - PMID:29955172: https://pubmed.ncbi.nlm.nih.gov/29955172/ - PMID:31851307: https://pubmed.ncbi.nlm.nih.gov/31851307/ - PMID:38480682: https://pubmed.ncbi.nlm.nih.gov/38480682/ - PMID:32506582: https://pubmed.ncbi.nlm.nih.gov/32506582/ No YAML files or `references_cache/*.md` files were edited for this review.
Codex secondary synthesis for disorder curation.
MONDO:0008947 (bilateral striopallidodentate calcinosis), with exact MONDO synonyms including PFBC, Primary Familial Brain Calcification, and narrow synonym Fahr disease.validate-references.PMID:40344186) states: To date, seven genes have been linked to PFBC.SLC20A2, XPR1, PDGFRB, PDGFBMYORG, JAM2, NAA60SLC20A2 is the major dominant phosphate-import gene (PMID:32506582).XPR1 adds the complementary phosphate-export defect (PMID:25938945).NAA60 converges on the same axis by lowering cell-surface SLC20A2 and extracellular phosphate uptake (PMID:38480682).PDGFB / PDGFRB connect PFBC to endothelial-pericyte biology and blood-brain barrier maintenance (PMID:23913003, PMID:23255827).JAM2 makes the neurovascular-unit hypothesis explicit through impaired cell-cell adhesion (PMID:31851307).MYORG is likely in the same broader pathway family, but the most validator-safe abstract wording is still more cautious (PMID:30656188).PMID:40344186 links NAA60 and SLC20A2 to Golgi integrity and highlights Golgi fragmentation as an emerging PFBC topic.PMID:31851307).PMID:39036637 supports dopaminergic replacement therapy for PFBC-associated parkinsonism.PMID:39121859 shows ASO-mediated splice correction as a potential therapy for SLC20A2 haploinsufficiency.