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Microtriplication 11q24.1 is an extremely rare partial autosomal tetrasomy, resulting from a partial triplication of the long arm of chromosome 11, characterized by intellectual disability (with severe verbal impairment), short stature with small extremities, keratoconus and distinctive facial features (round, course face, upward slanting palpebral fissures, mild synophris, large nose with thick ala nasi and triangular tip, large mouth with broad lips, short and smooth philtrum, large protruded chin, ears with adherent lobules). Additionally, patients are overweight and present hypercholesterolemia.
Features include very common findings: Coarse facial features, Hypertelorism, Smooth philtrum, and Short philtrum and others; and common findings: Cleft palate, Microcephaly, Hearing loss (hearing impairment), and Short neck and others.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Head and neck | 4 | Coarse facial features, Abnormal facial shape, Cleft palate |
Phenotype severity distribution: 31 very common features, 7 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
Data assembled from 3 of 12 sources · Last updated Sep 18, 2026, 7:12 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Brain and nerves |
3 |
Delayed speech and language development, Intellectual disability, Speech apraxia |
Bones and joints | 3 | Joint dislocation, Limitation of joint mobility, Sideways curvature of the spine (scoliosis) |
Arms and legs | 3 | Short foot, Clinodactyly of the 5th finger, Small hand |
Muscles | 2 | Limitation of joint mobility, Generalized hypotonia |
Eyes | 1 | Keratoconus |
Metabolism | 1 | High blood fat levels (hyperlipidemia) |
Growth and development | 1 | Short stature |
Ears | 1 | Hearing loss (hearing impairment) |