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Features include always present findings: Muscle stiffness, Mask-like facies, and Micrognathia; and very common findings: Short stature. 66 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Bones and joints | 14 | Anterior bowing of long bones, Excessive inward curve of the lower back (lumbar hyperlordosis), Kyphoscoliosis |
HSPG2 encodes heparan sulfate proteoglycan 2 (4,391 aa). Integral component of basement membranes. Highest expression in Artery Tibial (280.8 TPM) and Artery Aorta (227.2 TPM).
Schwartz-Jampel syndrome type 1 is caused by mutations in the HSPG2 gene on chromosome 1.
HSPG2 is classified as a druggable target (Druggable Genome and Kinase categories) with score 2.2.
Genetic testing for HSPG2 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Schwartz-Jampel syndrome type 1 has been reported in the published literature.
Phenotype severity distribution: 3 always present features, 1 very common feature, 24 common features.
No clinical trials have been registered for Schwartz-Jampel syndrome type 1.
162 publications have been identified in PubMed for Schwartz-Jampel syndrome type 1. Kisho has analyzed 111 by research type. Research spans Basic Science / Preclinical (29%), Review / Meta-Analysis (23%), and Case Report / Case Series (21%).
Research Type | Count | % of Total |
|---|---|---|
Laboratory research | 32 | 29% |
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 1:01 AM UTC
Online Mendelian Inheritance in Man
Common questions about Schwartz-Jampel syndrome type 1
Muscles
12 |
Muscle stiffness, Hip contracture, Muscle weakness |
Brain and nerves | 3 | Intellectual disability, Hyporeflexia, Waddling gait |
Head and neck | 3 | Flat face, High palate, Coronal cleft vertebrae |
Eyes | 2 | Cataract, Ptosis |
Arms and legs | 2 | Flexion contracture of toe, Joint contracture of the hand |
Pregnancy and birth | 1 | Congenital hip dislocation |
Lab test results | 1 | Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration) |
Growth and development | 1 | Short stature |
Research summaries |
25 |
23% |
Patient case studies | 23 | 21% |
Disease patterns and progression | 16 | 14% |
Testing and diagnosis research | 6 | 5% |
Clinical study results | 6 | 5% |
New treatment approaches | 2 | 2% |
Other research | 1 | 1% |
Econs MJ (2026). [PMID: 40913471](https://pubmed.ncbi.nlm.nih.gov/40913471/). *J Bone Miner Res*. [Diagnostic / Biomarker]
Young RE (2026). [PMID: 40931319](https://pubmed.ncbi.nlm.nih.gov/40931319/). *Clin Genet*. [Epidemiology / Natural History]
Deen Hayatu M (2026). [PMID: 41563457](https://pubmed.ncbi.nlm.nih.gov/41563457/). *Z Rheumatol*. [Review / Meta-Analysis]
Alves I (2026). [PMID: 41559786](https://pubmed.ncbi.nlm.nih.gov/41559786/). *Orphanet J Rare Dis*. [Review / Meta-Analysis]
Rius R (2026). [PMID: 41951959](https://pubmed.ncbi.nlm.nih.gov/41951959/). *Nat Genet*. [Case Report / Case Series]
Atmaca FG (2026). [PMID: 38212959](https://pubmed.ncbi.nlm.nih.gov/38212959/). *J Clin Res Pediatr Endocrinol*. [Case Report / Case Series]
Leitão E (2026). [PMID: 41912934](https://pubmed.ncbi.nlm.nih.gov/41912934/). *Nat Genet*. [Review / Meta-Analysis]
Zhytnik L (2026). [PMID: 41051363](https://pubmed.ncbi.nlm.nih.gov/41051363/). *J Bone Miner Res*. [Basic Science / Preclinical]
Horike N (2026). [PMID: 41748604](https://pubmed.ncbi.nlm.nih.gov/41748604/). *Nat Commun*. [Basic Science / Preclinical]
Savarirayan R (2026). [PMID: 41247754](https://pubmed.ncbi.nlm.nih.gov/41247754/). *JAMA Pediatr*. [Clinical Trial Publication]