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X-linked intellectual disability, Nascimento type is a rare X-linked intellectual disability syndrome characterized by intellectual disability (with severe speech impairment), a myxedematous appearance, dysmorphic facial features (including large head, synophrys, prominent supraorbital ridges, almond-shaped and deep-set eyes, large ears, wide mouth with everted lower lip and downturned lip corners), low posterior hairline, short, broad neck, marked general hirsutism and abnormal hair whorls, skin changes (e.g. dry skin or hypopigmented spots), widely spaced nipples, obesity, micropenis, onychodystrophy and seizures.
Features include always present findings: Short foot, Dry skin, Broad hallux, and Hypointensity of cerebral white matter on MRI and others; and very common findings: Wide intermamillary distance, Hirsutism, Wide mouth, and Micropenis. 39 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 9 | Poor speech, Seizure, Aggressive behavior |
Arms and legs | 2 | Short foot, 2-3 toe syndactyly |
Head and neck | 2 | Broad face, Macrocephaly |
Skin | 2 | Dry skin, Nail dystrophy |
Kidneys and urinary system | 1 | Horseshoe kidney |
UBE2A function has not been fully characterized.
Syndromic X-linked intellectual disability Nascimento type is caused by mutations in the UBE2A gene on chromosome X.
Genetic testing for UBE2A is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for syndromic X-linked intellectual disability Nascimento type has been reported in the published literature.
Phenotype severity distribution: 14 always present features, 4 very common features, 16 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for syndromic X-linked intellectual disability Nascimento type.
102 publications have been identified in PubMed for syndromic X-linked intellectual disability Nascimento type. Research spans Basic Science / Preclinical (33%), Review / Meta-Analysis (28%), and Case Report / Case Series (22%).
Research Type | Count | % of Total |
|---|---|---|
Laboratory research | 32 | 33% |
Research summaries | 27 | 28% |
Patient case studies | 21 | 22% |
Disease patterns and progression | 11 | 11% |
New treatment approaches | 3 | 3% |
Testing and diagnosis research | 2 | 2% |
Clinical study results | 1 | 1% |
Sidorina A (2026). [PMID: 41429203](https://pubmed.ncbi.nlm.nih.gov/41429203/). *J Lipid Res*. [Diagnostic / Biomarker]
Zhao Y (2026). [PMID: 41705901](https://pubmed.ncbi.nlm.nih.gov/41705901/). *Prenat Diagn*. [Review / Meta-Analysis]
Boelaert K (2026). [PMID: 41508830](https://pubmed.ncbi.nlm.nih.gov/41508830/). *J Clin Endocrinol Metab*. [Review / Meta-Analysis]
Weissgold S (2026). [PMID: 42028919](https://pubmed.ncbi.nlm.nih.gov/42028919/). *J Intellect Disabil Res*. [Review / Meta-Analysis]
Alexander JL (2026). [PMID: 41346295](https://pubmed.ncbi.nlm.nih.gov/41346295/). *Blood Adv*. [Basic Science / Preclinical]
Furtado Gomes I (2025). [PMID: 40156274](https://pubmed.ncbi.nlm.nih.gov/40156274/). *Clin Dysmorphol*. [Case Report / Case Series]
Arsenault LE (2025). [PMID: 40600106](https://pubmed.ncbi.nlm.nih.gov/40600106/). *Cureus*. [Case Report / Case Series]
Ali U (2025). [PMID: 41331337](https://pubmed.ncbi.nlm.nih.gov/41331337/). *Sci Rep*. [Basic Science / Preclinical]
Ito S (2025). [PMID: 40702043](https://pubmed.ncbi.nlm.nih.gov/40702043/). *Sci Rep*. [Gene Therapy / Novel Therapeutics]
Azar I (2025). [PMID: 40330142](https://pubmed.ncbi.nlm.nih.gov/40330142/). *JCO Oncol Adv*. [Basic Science / Preclinical]
Data assembled from 7 of 12 sources · Last updated Sep 18, 2026, 12:00 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center