ORPHA:3078
Severe X-linked intellectual disability, Gustavson type
Also known as: Gustavson syndrome
Query health: suspect — Only one of 2 strategies returned hits (phrase).
Publications
15
24.9th percentile
Trials
0
Interventional, condition-specific
Researchers
111
Distinct authors in sample
Gene link
RBMX
Moderate
Readiness
2/6
Stages with a signal
Clinical definition (Orphanet)
A rare, genetic, X-linked syndromic disorder characterized by severe , microcephaly, post-natal growth retardation, severe visual impairment or blindness (due to optic atrophy), severe hearing defect, spasticity, epileptic , restricted large-joint movements and early death (in infancy or early childhood). Facial features (large dysplastic ears and short broad nose) are additionally observed. There have been no further descriptions in the literature since 1993.
How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.
Cross-references
Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.
- MONDO:0010661
- MeSH:C536759
- OMIM:309555
- UMLS:C0795965
Research stages
Trial readiness signals
Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”
2/6 stages with a signal
No matched interventional trial; the gene is known and literature exists — preclinical or natural-history work may still be the practical next step.
- Gene identifiedPresent
Moderate — RBMX
- LiteraturePresent
15 matched papers (8 in last 10 years) Source
- Phenotype characterisedNot checked
Not yet enriched from Monarch / HPO
- Animal modelNot checked
Not yet enriched from Monarch / Alliance
- Orphan designationNot checked
FDA/EMA orphan-drug designation not enriched yet
- Interventional trialNot found
No matched interventional trial under our ClinicalTrials.gov rules
Biology
Genes and phenotypes
Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.
Do we know what causes it?
Probably — there is moderate evidence for RBMX.
GenCC classification: Moderate.
Phenotypes (Monarch / HPO)
Not enriched in this build — Monarch phenotype joins were not run for this record.
Animal models (Monarch / Alliance)
Not enriched in this build.
Literature
Is anyone studying this?
15
15 papers have ever been indexed under this name. For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.
15 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).
8 in the last 10 years · high confidence · 24.9th percentile (publications denominator)
Phrase hits: 15 · MeSH hits: 0
Who's working on it?
111
Distinct author names in 15 sampled papers — named people below.
Who's working on it?
No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.
- 01Amberger JS2 papers · 1994Papers in Europe PMC
- 02McKusick VA2 papers · 1994
Center for Medical Genetics, Johns Hopkins Hospital, Baltimore, MD 21287-4922.
Papers in Europe PMC - 03Abdel-Salam GMH1 paper · 2022
Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.
Papers in Europe PMC - 04Allen EA1 paper · 2009Papers in Europe PMC
- 05Ameur A1 paper · 2024
Department of Immunology, Genetics and Pathology, Biomedical Centre, Uppsala University, Uppsala, Sweden.
Papers in Europe PMC - 06Anitha A1 paper · 2025
Department of Neurogenetics, Institute for Communicative and Cognitive Neurosciences, Shoranur, Kerala, India.
Papers in Europe PMC - 07Annerén G1 paper · 2024
Department of Immunology, Genetics and Pathology, Biomedical Centre, Uppsala University, Uppsala, Sweden.
Papers in Europe PMC - 08Arnos KS1 paper · 2011Papers in Europe PMC
- 09Berry MN1 paper · 2000Papers in Europe PMC
- 10Bitner-Glindzicz M1 paper · 2011Papers in Europe PMC
Clinical research
Is a treatment being tested?
0
interventional trials for this specific condition
No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present).
Data as of 27 July 2026
No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.
high confidence · 36.5th percentile (trials denominator)
Recruiting interventional trials
From the matched ClinicalTrials.gov set
No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.
See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.
Where to find support
We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:
India — NPRD
Last verified 2026-07-26This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.
Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.
How we counted this
Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.
"Severe X-linked intellectual disability, Gustavson type" OR "Gustavson syndrome"
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"Severe X-linked intellectual disability, Gustavson type" OR "Gustavson syndrome" OR "RBMX"
Recall-expansion terms: RBMX
Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.
Query health: suspect — strategies attempted: phrase, recall-expansion; with hits: phrase
Run this search on ClinicalTrials.gov
Confidence reasoning
- Preferred label is multi-word and distinctive
- No synonyms dropped by stoplist
- No label/synonym collisions with other diseases in this corpus
Ingested 2026-07-26T22:09:43.372Z