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Diastrophic Dysplasia

Disease Pathophysiology Research Template

2026-04-02
Falcon MONDO:0009107 Model: Edison Scientific Literature 35 citations

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available. Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Disease Pathophysiology Research Template

Target Disease

  • Disease Name: Diastrophic Dysplasia
  • MONDO ID: (if available)
  • Category: Mendelian

Research Objectives

Please provide a comprehensive research report on the pathophysiology of Diastrophic Dysplasia. Focus on the molecular and cellular mechanisms underlying disease progression.

Required Information

1. Core Pathophysiology

  • What are the primary pathophysiological mechanisms?
  • What molecular pathways are dysregulated?
  • What cellular processes are affected?

2. Key Molecular Players

  • Genes/Proteins: Which genes are causally involved or implicated?
  • Chemical Entities: What metabolites, drugs, or small molecules are relevant?
  • Cell Types: Which cell types are primarily affected?
  • Anatomical Locations: Which tissues/organs are involved?

3. Biological Processes (for GO annotation)

  • What biological processes (GO terms) are disrupted?
  • Consider: signaling pathways, metabolic processes, cellular responses, transport, etc.

4. Cellular Components

  • Where in the cell do key processes occur?
  • Consider: organelles, membrane compartments, extracellular space, etc.

5. Disease Progression

  • What is the sequence of events from initial trigger to clinical manifestation?
  • Are there distinct stages or phases?

6. Phenotypic Manifestations

  • What are the key clinical phenotypes?
  • How do they relate to the underlying mechanisms?

Citation Requirements

  • Cite primary literature (PMID preferred) for all mechanistic claims
  • Prioritize recent reviews and landmark papers
  • Include direct quotes where possible to support key statements

Output Format

Structure your response as a narrative that could be used to populate a disease knowledge base entry with: - Pathophysiology description - Gene/protein annotations with ontology terms (HGNC, GO) - Phenotype associations (HP terms) - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Evidence items with PMIDs

Disease Pathophysiology Research Report: Diastrophic Dysplasia (DTD)

Target disease summary

Diastrophic dysplasia (DTD) is a rare autosomal recessive chondrodysplasia affecting cartilage and bone development, classically assigned MIM/OMIM #222600 and caused by biallelic pathogenic variants in SLC26A2 (also known as DTDST; OMIM #606718). (paganini2023identificationofpotential pages 1-3, silveira2022slc26a2dtdstspectruma pages 1-2)

MONDO mapping (available from Open Targets evidence in this run): MONDO_0009107 (diastrophic dysplasia). (gramegnatota2023chondrodysplasiascausedby pages 42-46)

1) Key concepts and definitions (current understanding)

Core molecular definition

SLC26A2 encodes a transmembrane sulfate/chloride antiporter that is critical for inorganic sulfate uptake into chondrocytes; intracellular sulfate is required to generate activated sulfate donors (e.g., PAPS) that drive glycosaminoglycan (GAG)/proteoglycan sulfation. Reduced sulfate transport results in undersulfated cartilage proteoglycans, which disrupt cartilage extracellular matrix (ECM) structure and endochondral ossification, producing the skeletal phenotype. (paganini2023identificationofpotential pages 1-3, gramegnatota2023chondrodysplasiascausedbya pages 42-46)

A key disease principle is the residual-activity model: across SLC26A2-related conditions (including lethal and non-lethal phenotypes), clinical severity correlates with residual sulfate transport capacity and degree of proteoglycan undersulfation. (paganini2023identificationofpotential pages 1-3)

2) Primary pathophysiological mechanisms (molecular and cellular)

2.1 Initiating lesion: sulfate transport defect → reduced proteoglycan sulfation

DTD pathophysiology begins with impaired sulfate uptake via SLC26A2, lowering the sulfate available for proteoglycan/GAG sulfation in cartilage. This results in cartilage proteoglycan undersulfation detectable biochemically and histochemically in mouse models and consistent with patient observations. (forlino2005adiastrophicdysplasia pages 8-9, paganini2023identificationofpotential pages 1-3)

Quantitative example (mouse dtd A386V model): chondroitin sulfation at birth was reported as approximately ~0.7 sulfate/disaccharide in dtd vs ~0.9 in wild type, with strong regional variation across cartilage zones. (mertz2012matrixdisruptionsgrowth pages 1-1)

2.2 ECM-level consequences: altered hydration/mechanics and collagen organization

Undersulfated proteoglycans alter cartilage ECM composition, architecture, and mechanics (reduced water retention and collagen “unmasking”), providing a mechanistic bridge from a transport defect to tissue fragility and abnormal morphogenesis. (gramegnatota2023chondrodysplasiascausedbya pages 42-46)

In the dtd mouse, reduced chondroitin sulfation correlated with reduced collagen orientation, including in the protective collagen layer of articular cartilage; this was proposed to contribute to progressive cartilage degeneration despite partial normalization of sulfation with age. (mertz2012matrixdisruptionsgrowth pages 1-1, mertz2012matrixdisruptionsgrowth media e64dc09b)

2.3 Growth plate dysfunction: impaired proliferation and delayed ossification

Mouse models show developmental consequences consistent with impaired endochondral ossification: - progressive changes in proteoglycan sulfation with age (P1–P60) (forlino2005adiastrophicdysplasia pages 8-9) - delayed secondary ossification center formation (forlino2005adiastrophicdysplasia pages 1-2) - growth-plate disorganization at later time points (P60) (forlino2005adiastrophicdysplasia pages 8-9)

Mechanistically, reduced proliferation has been linked to altered Indian hedgehog (Ihh) signaling and cell-cycle control via reduced p130 phosphorylation affecting E2F transcription factors, causing a G1 block (reported in a synthesis of model data). (gramegnatota2023chondrodysplasiascausedbyc pages 127-129)

2.4 Severe/“lethal-end” mechanism: collagen secretion defect → ER stress/UPR → FGFR3 overactivation

Beyond undersulfation, severe Slc26a2 deficiency models demonstrate a second major mechanism: impaired secretion of major cartilage collagens.

In slc26a2−/− chondrocytes, ColII and ColIX show strong intracellular retention with reduced extracellular deposition; ultrastructural data include ER distension and intracellular matrix-containing vesicles. (zheng2019suppressinguprdependentoveractivation pages 6-8)

This intracellular retention triggers ER stress and the unfolded protein response (UPR), with preferential activation/nuclear localization of ATF6, and increased ATF6 and FGFR3 protein levels. (zheng2019suppressinguprdependentoveractivation pages 6-8)

The same work links ATF6 to FGFR3 transcriptional upregulation and demonstrates overactivation of FGFR3 signaling (increased p-ERK1/2 and p-STAT1; hypersensitivity to FGF2). (zheng2019suppressinguprdependentoveractivation pages 6-8)

Interpretation (expert mechanistic synthesis): DTD pathophysiology is not solely “undersulfation,” but can include a UPR-driven signaling pathology (ATF6→FGFR3) that is targetable pharmacologically in preclinical models; this provides a mechanistic rationale for pathway-directed therapy. (zheng2019suppressinguprdependentoveractivation pages 1-2, li2024targetingfgfr3signaling pages 11-13)

3) Key molecular players (genes/proteins, chemicals, cells, tissues)

3.1 Genes/proteins

3.2 Chemical entities (relevant metabolites/drugs)

3.3 Cell types primarily affected

3.4 Anatomical locations

  • Cartilage ECM, especially growth plate and articular cartilage regions with high matrix synthesis rates show critical susceptibility and regional undersulfation. (mertz2012matrixdisruptionsgrowth pages 1-1, mertz2012matrixdisruptionsgrowth media e64dc09b)

4) Biological processes disrupted (GO-style descriptions)

From the mechanistic evidence in this corpus, disrupted processes include: - Sulfate transmembrane transport (SLC26A2-dependent). (paganini2023identificationofpotential pages 1-3, forlino2005adiastrophicdysplasia pages 8-9) - Proteoglycan/GAG sulfation and cartilage matrix assembly. (paganini2023identificationofpotential pages 1-3, gramegnatota2023chondrodysplasiascausedbya pages 42-46) - Extracellular matrix organization (collagen orientation/architecture and proteoglycan-dependent hydration). (mertz2012matrixdisruptionsgrowth pages 1-1, gramegnatota2023chondrodysplasiascausedbya pages 42-46) - Endochondral ossification / growth plate development (delayed ossification, reduced proliferation/differentiation). (forlino2005adiastrophicdysplasia pages 1-2, gramegnatota2023chondrodysplasiascausedbyc pages 127-129) - ER stress / unfolded protein response (ATF6 arm) and downstream FGFR3 signaling (in severe deficiency). (zheng2019suppressinguprdependentoveractivation pages 6-8)

(Exact GO identifiers were not retrievable from the provided text excerpts; mapping would require ontology lookup beyond the retrieved text.)

5) Cellular components implicated

6) Disease progression model (sequence of events)

  1. Biallelic SLC26A2 variants reduce sulfate transport into chondrocytes. (paganini2023identificationofpotential pages 1-3, forlino2005adiastrophicdysplasia pages 8-9)
  2. Lower intracellular sulfate limits activated sulfate donor availability and drives undersulfated proteoglycans in cartilage. (gramegnatota2023chondrodysplasiascausedbya pages 42-46, forlino2005adiastrophicdysplasia pages 8-9)
  3. Cartilage ECM abnormalities emerge (reduced sulfated matrix staining; altered collagen orientation), affecting mechanical properties and signaling. (forlino2005adiastrophicdysplasia pages 8-9, mertz2012matrixdisruptionsgrowth pages 1-1)
  4. Growth plate dysfunction with reduced proliferation/delayed maturation (and altered Ihh/p130/E2F control as reported) leads to impaired longitudinal bone growth and delayed ossification centers. (forlino2005adiastrophicdysplasia pages 8-9, gramegnatota2023chondrodysplasiascausedbyc pages 127-129, forlino2005adiastrophicdysplasia pages 1-2)
  5. In more severe contexts, collagen secretion defects cause ER stress/UPR, inducing ATF6-driven FGFR3 overactivation, further impairing cartilage growth and survival balance. (zheng2019suppressinguprdependentoveractivation pages 6-8)
  6. Clinically, these processes manifest as congenital skeletal dysplasia with progressive orthopedic complications and joint degeneration. (bondarenko2023slc26a2relateddiastrophic pages 1-2, harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)

7) Phenotypic manifestations (mechanism-linked)

Key clinical phenotypes

Genotype–phenotype relationships (selected examples)

A major, widely cited principle is that phenotype severity correlates with residual transport activity, but the same genotype can produce variable phenotypes. (paganini2023identificationofpotential pages 1-3, silveira2022slc26a2dtdstspectruma pages 9-10)

Population and allele effects: - Finland shows a strong founder effect for c.-26+2T>C, commonly homozygous in DTD, and the incidence has decreased over decades with increased prenatal diagnostics. (harkonen2021slc26a2associateddiastrophicdysplasia pages 1-2, harkonen2021slc26a2associateddiastrophicdysplasia pages 5-7) - p.R279W is frequent outside Finland and is associated with mild phenotype in homozygosity and can mitigate severity in compound heterozygosity (“rescue”). (silveira2022slc26a2dtdstspectruma pages 7-8) - Adult DTD example variants include p.Val341del and p.Cys653Ser in compound heterozygosity. (bondarenko2023slc26a2relateddiastrophic pages 1-2)

8) Recent developments and latest research (2023–2024 prioritized)

8.1 Biomarker development (2023)

A 2023 Bone study evaluated two non-invasive biomarkers for DTD: - Urinary GAG sulfation profiling via chondroitin sulfate disaccharide HPLC after chondroitinase digestion, reporting undersulfation in DTD patients. (paganini2023identificationofpotential pages 1-3) - CXM (N-terminal collagen X fragment) in dried blood spots, a “real-time marker of endochondral ossification and growth velocity,” reported lower-than-normal in most patients, with interpretation limited by strong age/sex/growth-velocity dependence. (paganini2023identificationofpotential pages 1-3)

These assays are positioned as practical tools to support future natural-history studies and clinical trials in DTD. (paganini2023identificationofpotential pages 1-3)

8.2 Targeted therapy and drug repurposing (2024)

Preclinical work in 2024 further operationalizes the UPR→FGFR3 model and evaluates FGFR inhibition: - Genetic reduction of Fgfr3 reduced pathway activity (p-ERK1/2 and p-STAT1 down) and partially alleviated phenotypes. (li2024targetingfgfr3signaling pages 11-13) - Pharmacologic inhibition using NVP-BGJ398 increased body size in Slc26a2 cKO mice at 49 days with prolonged treatment. (li2024targetingfgfr3signaling pages 11-13)

Authors explicitly caution that dosing for oncologic indications is much higher than dosing considered for pediatric skeletal indications, emphasizing translational constraints. (li2024targetingfgfr3signaling pages 11-13)

8.3 Expanded tissue biology: tooth development and Wnt signaling (2024)

A 2024 Disease Models & Mechanisms paper extends SLC26A2 biology beyond cartilage into odontogenesis, reporting: - significant reduction of sulfated GAG in upper molar tooth germs (P<0.0001) (yoshida2024slc26a2mediatedsulfatemetabolism pages 8-11) - KEGG enrichment identifying Wnt signaling as the most significantly enriched among downregulated genes (yoshida2024slc26a2mediatedsulfatemetabolism pages 8-11)

This supports a broader framework in which sulfate transport can modulate developmental signaling programs in multiple tissues. (yoshida2024slc26a2mediatedsulfatemetabolism pages 8-11)

8.4 Human cellular mechanism in related SLC26A2 phenotypes (2024)

In 2024, human primary chondrocyte experiments in SLC26A2-related MED-4 showed mutant SLC26A2 mislocalization and altered differentiation markers (e.g., decreased COL10A1/RUNX2/MMP13, increased ACAN), supporting a direct influence of SLC26A2 variants on chondrocyte differentiation programs. (li2024biallelicvariantsin pages 1-2)

9) Current applications and real-world implementations

9.1 Diagnostic pathways

9.2 Prenatal screening/diagnosis

9.3 Clinical management

There is no established disease-modifying therapy; management is largely supportive, including physiotherapy and corrective orthopedic surgery. (harkonen2021slc26a2associateddiastrophicdysplasia pages 1-2)

In the Finnish cohort, common surgeries included knee operations (n=9), cleft palate repair (n=8), club foot surgeries (n=7), and Achilles tenotomy (n=6). (harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)

9.4 Biomarkers for monitoring and trial readiness

Urinary GAG sulfation and dried-blood-spot CXM are proposed as practical non-invasive biomarkers for DTD monitoring and future trials. (paganini2023identificationofpotential pages 1-3)

10) Relevant statistics and recent data

Incidence/epidemiology

Clinical severity (Finnish pediatric cohort)

Quantitative pathophysiology (mouse)

11) Evidence-focused knowledge-base table

The following artifact organizes entities, mechanisms, biomarkers, and phenotypes for direct knowledge-base ingestion.

Table (click to expand)
Entity type Identifier/ontology mapping Role in pathophysiology Key evidence URL/DOI Citation context ID(s)
Gene/Protein SLC26A2 (HGNC symbol); MONDO: MONDO_0009107; OMIM disease 222600; gene OMIM 606718 Plasma-membrane sulfate/chloride antiporter that supplies intracellular sulfate for proteoglycan sulfation; biallelic loss causes DTD spectrum. Paganini et al., 2023: SLC26A2 “encodes for a transmembrane sulfate transporter”; severity correlates with “residual sulfate transport.” Silveira et al., 2022 identifies DTD OMIM #222600 and SLC26A2/DTDST OMIM #606718. https://doi.org/10.1016/j.bone.2023.116838 ; https://doi.org/10.1159/000525020 (paganini2023identificationofpotential pages 1-3, silveira2022slc26a2dtdstspectruma pages 1-2)
Pathway GO ID not retrieved; sulfate transport / proteoglycan sulfation / PAPS-dependent sulfation Reduced sulfate uptake lowers intracellular sulfate availability for sulfation, causing undersulfated cartilage proteoglycans. Gramegna-Tota, 2023: impaired SLC26A2 function “producing reduced intracellular sulfate and undersulfation of proteoglycans (PGs).” Forlino et al., 2005: “Chondroitin sulfate proteoglycans were undersulfated.” https://doi.org/10.1093/hmg/ddi079 (gramegnatota2023chondrodysplasiascausedbya pages 42-46, forlino2005adiastrophicdysplasia pages 8-9)
Pathway GO ID not retrieved; endochondral ossification Undersulfated matrix disrupts growth-plate cartilage and endochondral bone formation. Paganini et al., 2023: PG sulfation is essential for “normal cartilaginous matrix structure and endochondral ossification.” https://doi.org/10.1016/j.bone.2023.116838 (paganini2023identificationofpotential pages 1-3)
Pathway GO ID not retrieved; FGFR3 signaling In severe Slc26a2 deficiency, ATF6-dependent UPR increases FGFR3 signaling, suppressing cartilage growth and differentiation. Zheng et al., 2019: ATF6 induces excessive FGFR3 expression; p-ERK1/2 and p-STAT1 are increased. Li et al., 2024: NVP-BGJ398 caused a “significant increase in body size” in Slc26a2 cKO mice. https://doi.org/10.1016/j.ebiom.2019.01.010 ; https://doi.org/10.1016/j.jot.2023.09.003 (zheng2019suppressinguprdependentoveractivation pages 6-8, li2024targetingfgfr3signaling pages 11-13)
Pathway GO ID not retrieved; UPR / ATF6 ER-stress pathway Collagen retention in chondrocytes triggers ER stress, with preferential ATF6 activation in severe disease models. Zheng et al., 2019: “increased expression of ATF4, BIP, CHOP, ATF6 and XBP1” with preferential ATF6 nuclear localization. https://doi.org/10.1016/j.ebiom.2019.01.010 (zheng2019suppressinguprdependentoveractivation pages 6-8, zheng2019suppressinguprdependentoveractivation pages 1-2)
Pathway GO ID not retrieved; Indian hedgehog (Ihh) signaling Altered Ihh signaling contributes to reduced chondrocyte proliferation and growth-plate dysfunction in hypomorphic DTD models. Gramegna-Tota, 2023: reduced proliferation is associated with “altered Indian hedgehog (Ihh) signaling.” URL not retrieved (gramegnatota2023chondrodysplasiascausedbyc pages 127-129)
Pathway GO ID not retrieved; cell-cycle regulation (p130/E2F) Reduced p130 phosphorylation causes G1 block and contributes to impaired proliferation of growth-plate chondrocytes. Gramegna-Tota, 2023: reduced p130 phosphorylation affects E2F transcription factors and causes a “G1 phase block.” URL not retrieved (gramegnatota2023chondrodysplasiascausedbyc pages 127-129)
Pathway GO ID not retrieved; Wnt signaling Recent non-cartilage work suggests Slc26a2-dependent sulfate metabolism can modulate Wnt-linked differentiation programs. Yoshida et al., 2024: KEGG analysis found Wnt signaling was the “most significantly enriched pathway among downregulated genes”; sulfated GAG reduction in upper molars was P<0.0001. https://doi.org/10.1242/dmm.052107 (yoshida2024slc26a2mediatedsulfatemetabolism pages 8-11)
Cell type CL: chondrocyte ID not retrieved Primary disease cell type; defective sulfate uptake alters proliferation, differentiation, matrix secretion, and survival responses. Forlino et al., 2005: sulfate uptake impaired in chondrocytes; Zheng et al., 2019: intracellular retention of ColII/ColIX in slc26a2−/− chondrocytes. https://doi.org/10.1093/hmg/ddi079 ; https://doi.org/10.1016/j.ebiom.2019.01.010 (forlino2005adiastrophicdysplasia pages 1-2, zheng2019suppressinguprdependentoveractivation pages 6-8)
Cell type CL ID not retrieved; hypertrophic chondrocyte Terminal differentiation is delayed/perturbed, contributing to abnormal ossification and growth-plate maturation. Forlino et al., 2005: few apoptotic hypertrophic chondrocytes at P21; Li et al., 2024 reports altered Col X and differentiation markers after FGFR3 targeting. https://doi.org/10.1093/hmg/ddi079 ; https://doi.org/10.1016/j.jot.2023.09.003 (forlino2005adiastrophicdysplasia pages 8-9, li2024targetingfgfr3signaling pages 11-13)
Cell type CL ID not retrieved; osteoblast Sulfate uptake is affected in osteoblasts, but major proteoglycan undersulfation is most evident in cartilage; bone remodeling changes are likely secondary to matrix defects. Forlino et al., 2005: uptake impaired in osteoblasts; Gualeni et al., 2013: high osteoclast resorption/reduced osteoblast activity despite normal cell numbers. https://doi.org/10.1093/hmg/ddi079 ; https://doi.org/10.1016/j.bone.2013.01.036 (forlino2005adiastrophicdysplasia pages 1-2, gualeni2013alterationofproteoglycan pages 9-9)
Cell type CL ID not retrieved; fibroblast Useful diagnostic/functional cell type for demonstrating reduced sulfate uptake, though cartilage is most pathologically affected. Paganini 2020 summary: “reduced sulfate uptake in fibroblasts”; Forlino et al., 2005 also notes impaired uptake in fibroblasts. https://doi.org/10.3390/ijms21082710 ; https://doi.org/10.1093/hmg/ddi079 (paganini2020skeletaldysplasiascaused pages 9-10, forlino2005adiastrophicdysplasia pages 1-2)
Tissue/Anatomy UBERON ID not retrieved; cartilage Principal affected tissue because cartilage ECM is rich in sulfated proteoglycans and highly dependent on sulfate flux. Gramegna-Tota, 2023: significant PG undersulfation was detected “only in cartilage.” URL not retrieved (gramegnatota2023chondrodysplasiascausedbyc pages 127-129)
Tissue/Anatomy UBERON ID not retrieved; growth plate cartilage Regional undersulfation disrupts proliferation and matrix architecture in zones crucial for bone elongation. Mertz et al., 2012: undersulfation was mild overall but strong in “narrow articular and growth plate regions crucial for bone development.” https://doi.org/10.1074/jbc.m110.116467 (mertz2012matrixdisruptionsgrowth pages 1-1, mertz2012matrixdisruptionsgrowth media e64dc09b)
Tissue/Anatomy UBERON ID not retrieved; articular cartilage Matrix abnormalities and collagen disorganization in the articular surface likely drive progressive degeneration with age. Mertz et al., 2012: collagen orientation was reduced in the protective surface layer; articular cartilage “degrades with age.” https://doi.org/10.1074/jbc.m110.116467 (mertz2012matrixdisruptionsgrowth pages 1-1, mertz2012matrixdisruptionsgrowth media e64dc09b)
Tissue/Anatomy UBERON ID not retrieved; bone / secondary ossification center Delayed ossification and altered bone remodeling emerge downstream of abnormal cartilage matrix and growth-plate biology. Forlino et al., 2005: “delayed secondary ossification center formation”; Gualeni et al., 2013: alteration of PG sulfation affects bone growth and remodeling. https://doi.org/10.1093/hmg/ddi079 ; https://doi.org/10.1016/j.bone.2013.01.036 (forlino2005adiastrophicdysplasia pages 1-2, gualeni2013alterationofproteoglycan pages 9-9)
Cellular component GO ID not retrieved; plasma membrane SLC26A2 acts at the cell membrane to import sulfate into target cells. Paganini et al., 2023 and Paganini 2020 describe SLC26A2 as a “transmembrane sulfate transporter” / “Sulfate/chloride antiporter present on cell membrane.” https://doi.org/10.1016/j.bone.2023.116838 ; https://doi.org/10.3390/ijms21082710 (paganini2023identificationofpotential pages 1-3, paganini2020skeletaldysplasiascaused pages 9-10)
Cellular component GO ID not retrieved; endoplasmic reticulum Severe deficiency causes intracellular collagen retention, ER distension, and ER-stress signaling. Zheng et al., 2019: “massive intracellular accumulation of matrix-containing vesicles, ER distension in chondrocytes.” https://doi.org/10.1016/j.ebiom.2019.01.010 (zheng2019suppressinguprdependentoveractivation pages 6-8)
Cellular component GO ID not retrieved; extracellular matrix Undersulfated PGs alter matrix composition, hydration, collagen organization, and tissue mechanics. Gramegna-Tota, 2023: undersulfated PGs alter ECM “composition, architecture, signalling and mechanics”; Mertz et al., 2012 links undersulfation to collagen disorientation. https://doi.org/10.1074/jbc.m110.116467 (gramegnatota2023chondrodysplasiascausedbya pages 42-46, mertz2012matrixdisruptionsgrowth pages 1-1)
Chemical entity CHEBI ID not retrieved; sulfate / inorganic sulfate Limiting substrate whose defective uptake is the initiating biochemical lesion. Gramegna-Tota, 2023 notes intracellular sulfate pool depends on extracellular uptake; Forlino et al., 2005: “sulfate uptake is impaired in dtd animals.” https://doi.org/10.1093/hmg/ddi079 (gramegnatota2023chondrodysplasiascausedbya pages 42-46, forlino2005adiastrophicdysplasia pages 8-9)
Chemical entity CHEBI ID not retrieved; PAPS Universal activated sulfate donor whose supply becomes limiting when intracellular sulfate is reduced. Gramegna-Tota, 2023: insufficient intracellular sulfate “limits formation of PAPS, the universal sulfate donor.” URL not retrieved (gramegnatota2023chondrodysplasiascausedbya pages 42-46)
Chemical entity CHEBI ID not retrieved; chondroitin sulfate / sulfated GAGs Major matrix component whose undersulfation tracks with structural and biomechanical defects in cartilage. Mertz et al., 2012: chondroitin sulfation about ~0.7 sulfate/disaccharide in dtd vs ~0.9 in wild type; region-specific deficits mapped across cartilage. https://doi.org/10.1074/jbc.m110.116467 (mertz2012matrixdisruptionsgrowth pages 1-1, mertz2012matrixdisruptionsgrowth media e64dc09b)
Chemical entity CHEBI ID not retrieved; N-acetylcysteine (NAC) Experimental sulfate surrogate/thiol donor proposed to improve intracellular sulfate availability and proteoglycan sulfation. Härkönen et al., 2021: “Dtd mice treated with NAC showed an increase in cartilage proteoglycan sulfation and improvement of the skeletal phenotype.” Li et al., 2024: NAC selected “as an alternative to intracellular sulfate.” https://doi.org/10.3390/genes12050714 ; https://doi.org/10.1016/j.jot.2023.09.003 (harkonen2021slc26a2associateddiastrophicdysplasia pages 1-2, li2024targetingfgfr3signaling pages 11-13)
Chemical entity CHEBI ID not retrieved; NVP-BGJ398 / infigratinib Experimental FGFR inhibitor repurposed to suppress pathogenic FGFR3 overactivation in Slc26a2-deficient models. Li et al., 2024: prolonged treatment led to a “significant increase in body size in Slc26a2 cKO mice at 49 days postnatally.” https://doi.org/10.1016/j.jot.2023.09.003 (li2024targetingfgfr3signaling pages 11-13)
Biomarker ID not retrieved; urinary GAG sulfation / chondroitin sulfate disaccharides Non-invasive readout of systemic proteoglycan undersulfation. Paganini et al., 2023: “Undersulfation of urinary GAGs” measured by HPLC after chondroitinase digestion; both biomarkers judged “promising assays.” https://doi.org/10.1016/j.bone.2023.116838 (paganini2023identificationofpotential pages 1-3)
Biomarker ID not retrieved; CXM (N-terminal collagen X fragment) Candidate blood-spot biomarker of endochondral ossification and growth velocity in DTD. Paganini et al., 2023: CXM is “a real-time marker of endochondral ossification and growth velocity”; most patients had “Lower than normal CXM levels.” https://doi.org/10.1016/j.bone.2023.116838 (paganini2023identificationofpotential pages 1-3)
Phenotype/Clinical HP ID not retrieved; short-limb short stature / disproportionate short stature Reflects chronically reduced endochondral growth from growth-plate dysfunction. Härkönen et al., 2021: median height SDS at last follow-up was −5.5 for girls and −4.1 for boys with DTD. https://doi.org/10.3390/genes12050714 (harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)
Phenotype/Clinical HP ID not retrieved; joint dysplasia / contractures Matrix and growth-plate abnormalities alter joint shape and mobility from early development onward. Bondarenko et al., 2023 describes “defective joint and skeletal development”; Härkönen et al., 2021 reports frequent knee/patellar problems and multiple knee surgeries. https://doi.org/10.2478/bjmg-2022-0018 ; https://doi.org/10.3390/genes12050714 (bondarenko2023slc26a2relateddiastrophic pages 1-2, harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)
Phenotype/Clinical HP ID not retrieved; spinal deformity (scoliosis/kyphosis) Progressive vertebral and connective-tissue involvement follows abnormal cartilage/bone development. Bondarenko et al., 2023 notes “progressive spinal deformity (scoliosis/kyphosis).” https://doi.org/10.2478/bjmg-2022-0018 (bondarenko2023slc26a2relateddiastrophic pages 1-2)
Phenotype/Clinical HP ID not retrieved; ear swelling / malformed pinnae Classic external ear phenotype in DTD, likely reflecting abnormal cartilage development outside the appendicular skeleton. Bondarenko et al., 2023 mentions external ear/pinna abnormalities; DTD is historically characterized by cystic swelling of the external ear. https://doi.org/10.2478/bjmg-2022-0018 (bondarenko2023slc26a2relateddiastrophic pages 1-2)
Phenotype/Clinical HP ID not retrieved; cleft palate Craniofacial/cartilage developmental consequence common in clinical cohorts. Härkönen et al., 2021: cleft palate in 64% of cohort; cleft palate repair performed in n=8. https://doi.org/10.3390/genes12050714 (harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)
Phenotype/Clinical HP ID not retrieved; respiratory insufficiency in neonates Severe thoracic/airway consequences can complicate neonatal course in DTD. Härkönen et al., 2021: respiratory insufficiency after birth in 36% (5/14), with three requiring intensive care. https://doi.org/10.3390/genes12050714 (harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)
Phenotype/Clinical HP ID not retrieved; prenatal short limbs / skeletal abnormality on ultrasound Real-world prenatal screening often detects DTD before birth. Härkönen et al., 2021: 77% (10/13) suspected prenatally; structural ultrasound showed short limbs in all 10 suspected pregnancies. https://doi.org/10.3390/genes12050714 (harkonen2021slc26a2associateddiastrophicdysplasia pages 4-5)
Phenotype/Clinical HP ID not retrieved; genotype–phenotype continuum Residual transporter activity modifies severity across ACG1B/AO2, DTD, and rMED. Paganini et al., 2023: severity ranges from lethal forms to rMED and “correlates with the level of residual sulfate transport.” Silveira et al., 2022: R279W is mild in homozygosity and can rescue more severe alleles. https://doi.org/10.1016/j.bone.2023.116838 ; https://doi.org/10.1159/000525020 (paganini2023identificationofpotential pages 1-3, silveira2022slc26a2dtdstspectruma pages 7-8, silveira2022slc26a2dtdstspectruma pages 9-10)

Table: This table organizes key entities, mechanisms, biomarkers, and clinical phenotypes relevant to diastrophic dysplasia for a disease knowledge base. It links each item to ontology/identifier information where available, concise mechanistic roles, and directly cited supporting evidence.

12) Notes on evidence limitations (PMID requirement)

The user requested PMIDs for mechanistic claims; however, the retrieved full-text excerpts in this run largely provide DOIs and URLs but not PMIDs. Mechanistic claims above are therefore cited to the retrieved document context IDs (as required by the toolchain) and can be cross-walked to PMIDs using the DOIs/metadata if needed. (paganini2023identificationofpotential pages 1-3, li2024targetingfgfr3signaling pages 11-13)

References

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