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A Griscelli syndrome characterized by silvery gray sheen of the hair, hypopigmentation of the skin and neurological impairment without immunodeficiency that has material basis in mutations in the MYO5A gene on chromosome 15q21.2.
Features include always present findings: Melanin pigment aggregation in hair shafts, Silver-gray hair, White eyelashes, and Large clumps of pigment irregularly distributed along hair shaft and others; and very common findings: Seizure, Hypopigmentation of the skin, Accumulation of melanosomes in melanocytes, and Damage to the retina (retinopathy) and others. 25 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 6 | Seizure, Global developmental delay, Intellectual disability |
Eyes | 3 | Damage to the retina (retinopathy), Nystagmus, Diplopia |
Muscles | 2 | Low muscle tone (hypotonia), Generalized hypotonia |
Skin | 1 | Hypopigmentation of the skin |
Metabolism | 1 | High blood fat levels (hyperlipidemia) |
MYO5A encodes myosin VA (1,855 aa). Processive actin-based motor that can move in large steps approximating the 36-nm pseudo-repeat of the actin filament. Highest expression in Brain Cerebellar Hemisphere (68.3 TPM) and Brain Cerebellum (59.0 TPM).
Griscelli syndrome type 1 is caused by mutations in the MYO5A gene on chromosome 15.
The MYO5A protein participates in MITF-M-dependent MYO5A expression, MLPH/MYRIP bind GGC-RAB27A and MYO5A, and MITF-M-dependent RAB27A expression pathways.
MYO5A is classified as a druggable target with score 0.0.
Genetic testing for MYO5A is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Griscelli syndrome type 1 has been reported in the published literature.
Phenotype severity distribution: 5 always present features, 14 very common features, 5 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Griscelli syndrome type 1.
135 publications have been identified in PubMed for Griscelli syndrome type 1. Research spans Review / Meta-Analysis (35%), Basic Science / Preclinical (23%), and Epidemiology / Natural History (15%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 47 | 35% |
Laboratory research | 31 | 23% |
Disease patterns and progression | 20 | 15% |
Patient case studies | 17 | 13% |
Clinical study results | 10 | 7% |
New treatment approaches | 6 | 4% |
Testing and diagnosis research | 3 | 2% |
Other research | 1 | 1% |
Stump K (2026). [PMID: 41719026](https://pubmed.ncbi.nlm.nih.gov/41719026/). *Hand (N Y)*. [Epidemiology / Natural History]
Papingi D (2026). [PMID: 41851022](https://pubmed.ncbi.nlm.nih.gov/41851022/). *American journal of medical genetics. Part A*. [Case Report / Case Series]
Eslalakawi Y (2026). [PMID: 41804592](https://pubmed.ncbi.nlm.nih.gov/41804592/). *Cancer Control*. [Review / Meta-Analysis]
Rabbani SA (2026). [PMID: 42198407](https://pubmed.ncbi.nlm.nih.gov/42198407/). *Pharmaceuticals (Basel)*. [Review / Meta-Analysis]
Monika F (2026). [PMID: 42193013](https://pubmed.ncbi.nlm.nih.gov/42193013/). *Cancers (Basel)*. [Review / Meta-Analysis]
Aldahi WA (2026). [PMID: 41678007](https://pubmed.ncbi.nlm.nih.gov/41678007/). *Diabetes therapy : research, treatment and education of diabetes and related disorders*. [Review / Meta-Analysis]
Okuda Y (2026). [PMID: 40971131](https://pubmed.ncbi.nlm.nih.gov/40971131/). *Clinical and experimental nephrology*. [Epidemiology / Natural History]
Nguyen T (2026). [PMID: 42118699](https://pubmed.ncbi.nlm.nih.gov/42118699/). *Cardiorenal Med*. [Review / Meta-Analysis]
Curcio A (2026). [PMID: 41652617](https://pubmed.ncbi.nlm.nih.gov/41652617/). *J Transl Med*. [Review / Meta-Analysis]
Celik O (2026). [PMID: 40743996](https://pubmed.ncbi.nlm.nih.gov/40743996/). *Obesity facts*. [Review / Meta-Analysis]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 6:54 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Griscelli syndrome type 1