Traits

Traits linked to MYMX

myomixer, myoblast fusion factor

The Human Phenotype Ontology links 57 traits to MYMX, by body system: features seen in people with one of the gene's rare conditions.

Abnormality of head or neck

Trait	How often it is seen
Decreased facial expressions	Always
Deep bite	Always
Dental crowding	Always
Downturned corners of mouth	Always
High, narrow palate	Always
Hooded upper eyelid	Always
Little lower jaw	Always
Long philtrum	Always
Thin red part of the upper lip	Always
Underdeveloped tissue around nostril	Always
Weakness of facial musculature	Always
Aplasia/Hypoplasia of the tongue	Very often (80–99%)
Bell's palsy	Very often (80–99%)
Decreased volume of lip	Very often (80–99%)
Downward slanting of the opening between the eyelids	Very often (80–99%)
Eye folds	Very often (80–99%)
Nasal tip, upturned	Very often (80–99%)
Pierre-Robin sequence	Very often (80–99%)
Short nose	Very often (80–99%)
Abnormality of septum of nose	Often (30–79%)
Abnormally small head	Often (30–79%)
Cleft palate	Often (30–79%)
High palate	Often (30–79%)
Retraction of the tongue	Often (30–79%)
Velopharyngeal incompetence	Often (30–79%)

Abnormality of the musculoskeletal system

Trait	How often it is seen
Abnormally shaped muscle	Always
Muscle weakness	Always
Low muscle tone	Very often (80–99%)
Muscle degeneration	Very often (80–99%)
Axial muscle weakness	Often (30–79%)
Scoliosis	Often (30–79%)
Abnormal deposits of calcium in the brain	Sometimes (5–29%)
Muscle tissue disease	Sometimes (5–29%)

Abnormality of limbs

Trait	How often it is seen
High-arched foot	Always
Pes valgus	Always
Short fingers or toes	Very often (80–99%)
Club feet	Often (30–79%)
Aplasia of the pectoralis major muscle	Sometimes (5–29%)
Finger bends toward pinky	Sometimes (5–29%)

Abnormality of the nervous system

Trait	How often it is seen
Cranial nerve paralysis	Often (30–79%)
Intellectual disability	Often (30–79%)
Absent/small cerebellum	Sometimes (5–29%)
Ventriculomegaly	Sometimes (5–29%)

Abnormality of the ear

Trait	How often it is seen
Prominent ear	Always
Ears rotated toward back of head	Often (30–79%)
Low-set ears	Often (30–79%)

Growth abnormality

Trait	How often it is seen
Faltering weight	Often (30–79%)
Growth delay	Often (30–79%)
Short stature	Often (30–79%)

Abnormality of the eye

Trait	How often it is seen
Drooping upper eyelid	Very often (80–99%)
Impaired ocular abduction	Very often (80–99%)

Abnormality of the genitourinary system

Trait	How often it is seen
Glanular hypospadias	Sometimes (5–29%)
Hydronephrosis	Sometimes (5–29%)

Abnormality of the respiratory system

Trait	How often it is seen
Abnormality of the larynx	Sometimes (5–29%)
Laryngeal stenosis	Sometimes (5–29%)

Abnormality of the cardiovascular system

Trait	How often it is seen
Hypertensive crisis	Sometimes (5–29%)

Abnormality of the voice

Trait	How often it is seen
Nasal speech	Often (30–79%)

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 MYMX and how often each is seen. Find out more at hpo.jax.org.

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