Traits

Traits linked to MRAS

muscle RAS oncogene homolog

The Human Phenotype Ontology links 83 traits to MRAS, by body system: features seen in people with one of the gene's rare conditions.

MRAS

Abnormality of head or neck

Trait	How often it is seen
Bulbous nose	Always
Depressed nasal bridge	Always
Downward slanting of the opening between the eyelids	Always
Full lips	Always
Relatively large head	Always
Cystic hygroma	Very often (80–99%)
Full lower lip	Very often (80–99%)
High forehead	Very often (80–99%)
High palate	Very often (80–99%)
Little lower jaw	Very often (80–99%)
Midface retrusion	Very often (80–99%)
Thickened skin folds of neck	Very often (80–99%)
Triangular face	Very often (80–99%)
Webbed neck	Very often (80–99%)
Long face	Often (30–79%)
Low hairline at back of neck	Often (30–79%)
Pointed chin	Often (30–79%)

Abnormality of the cardiovascular system

Trait	How often it is seen
Abnormal cardiovascular system morphology	Very often (80–99%)
Abnormal EKG	Very often (80–99%)
Narrowing of lung artery	Very often (80–99%)
Abnormal heart rate	Often (30–79%)
Abnormal pulmonary valve morphology	Often (30–79%)
Abnormality of the lymphatic system	Often (30–79%)
Abnormality of the spleen	Often (30–79%)
An opening in the wall separating the top two chambers of the heart	Often (30–79%)
Enlarged and thickened heart muscle	Often (30–79%)
Narrowing of pulmonic valve	Often (30–79%)
Narrowing of aorta	Sometimes (5–29%)
Patent ductus arteriosus	Rarely (1–4%)

Abnormality of the musculoskeletal system

Trait	How often it is seen
Double-Jointed	Very often (80–99%)
Funnel chest	Very often (80–99%)
Muscle weakness	Very often (80–99%)
Pigeon chest	Very often (80–99%)
Wide rib cage	Very often (80–99%)
Delayed bone maturation	Often (30–79%)
Low muscle tone	Often (30–79%)
Scoliosis	Often (30–79%)
Osteopenia	Sometimes (5–29%)

Abnormality of the nervous system

Trait	How often it is seen
Delayed ability to walk	Always
Delayed speech and language development	Always
Global developmental delay	Always
Abnormal speech pattern	Very often (80–99%)
Difficulty articulating speech	Very often (80–99%)
Neurodevelopmental delay	Often (30–79%)
Intellectual disability	Sometimes (5–29%)
Specific learning disability	Sometimes (5–29%)

Abnormality of the ear

Trait	How often it is seen
Bilateral sensorineural hearing impairment	Always
Ears rotated toward back of head	Always
Low-set ears	Always
Thickened helices	Very often (80–99%)
Aplasia of the semicircular canal	Sometimes (5–29%)
Sensorineural hearing impairment	Sometimes (5–29%)

Abnormality of the eye

Trait	How often it is seen
Wide-set eyes	Always
Bulging eye	Very often (80–99%)
Drooping upper eyelid	Very often (80–99%)
Blue eyes	Often (30–79%)
Cross-eyed	Often (30–79%)
Involuntary, rapid, rhythmic eye movements	Sometimes (5–29%)

Abnormality of blood and blood-forming tissues

Trait	How often it is seen
Abnormal platelet function	Often (30–79%)
Abnormality of coagulation	Often (30–79%)
Bleeding tendency	Often (30–79%)
Bruising susceptibility	Sometimes (5–29%)
Juvenile myelomonocytic leukemia	Sometimes (5–29%)

Abnormality of limbs

Trait	How often it is seen
Excessive wrinkled skin of palms and soles	Often (30–79%)
Curvature of little finger	Sometimes (5–29%)
Fused forearm bones	Sometimes (5–29%)
Short fingers or toes	Sometimes (5–29%)

Abnormality of the integument

Trait	How often it is seen
Abnormal fingerprints	Often (30–79%)
Abnormal hair quantity	Often (30–79%)
Coarse hair	Often (30–79%)
Beauty mark	Sometimes (5–29%)

Abnormality of the digestive system

Trait	How often it is seen
Feeding difficulties in infancy	Always
Absent/small abdominal wall muscles	Very often (80–99%)
Enlarged liver	Often (30–79%)

Abnormality of the genitourinary system

Trait	How often it is seen
Abnormality of the reproductive system	Often (30–79%)
Undescended testes	Often (30–79%)
Dilatation of the renal pelvis	Sometimes (5–29%)

Abnormality of the endocrine system

Trait	How often it is seen
Hypogonadotropic hypogonadism	Very often (80–99%)
Delayed start of first period	Sometimes (5–29%)

Growth abnormality

Trait	How often it is seen
Short stature	Very often (80–99%)
Growth delay as children	Sometimes (5–29%)

Abnormality of the breast

Trait	How often it is seen
Wide-spaced nipples	Very often (80–99%)

Laboratory abnormality

Trait	How often it is seen
Swelling caused by excess lymph fluid under skin	Sometimes (5–29%)

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Where this comes from

The Human Phenotype Ontology, release 2026-09-01: the traits linked to MRAS and how often each is seen. Find out more at hpo.jax.org.

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