Traits

Traits linked to PIGP

phosphatidylinositol glycan anchor biosynthesis class P

The Human Phenotype Ontology links 76 traits to PIGP, by body system: features seen in people with one of the gene's rare conditions.

Abnormality of the nervous system

Trait	How often it is seen
Epilepsy	Always
Epileptic encephalopathy	Very often (80–99%)
Focal motor seizure	Very often (80–99%)
Generalized myoclonic seizure	Very often (80–99%)
Global developmental delay	Very often (80–99%)
Intellectual disability	Very often (80–99%)
Difficulty sleeping	Often (30–79%)
EEG abnormality	Often (30–79%)
EEG with burst suppression	Often (30–79%)
Focal tonic seizure	Often (30–79%)
Hypsarrhythmia	Often (30–79%)
Increased reflexes	Often (30–79%)
Lethargy	Often (30–79%)
Autism spectrum disorder	Sometimes (5–29%)
Brief seizures with staring spells	Sometimes (5–29%)
Choreoathetosis	Sometimes (5–29%)
Degeneration of cerebellum	Sometimes (5–29%)
Delayed myelination	Sometimes (5–29%)
Diffuse cerebral atrophy	Sometimes (5–29%)
Diffuse white matter abnormalities	Sometimes (5–29%)
Disorder of involuntary muscle movements	Sometimes (5–29%)
EEG with spike-wave complexes	Sometimes (5–29%)
Episodic ataxia	Sometimes (5–29%)
Febrile seizure (within the age range of 3 months to 6 years)	Sometimes (5–29%)
Fewer and broader ridges in brain	Sometimes (5–29%)
Generalized clonic seizure	Sometimes (5–29%)
Generalized tonic seizure	Sometimes (5–29%)
Grand mal seizures	Sometimes (5–29%)
Infantile spasms	Sometimes (5–29%)
Jerking	Sometimes (5–29%)
Loss of developmental milestones	Sometimes (5–29%)
More active than typical	Sometimes (5–29%)
Seizure affecting one half of brain	Sometimes (5–29%)
Self-injurious behavior	Sometimes (5–29%)
Sudden loss of muscle tone	Sometimes (5–29%)
Tremor	Sometimes (5–29%)
Underdevelopment of part of brain called corpus callosum	Sometimes (5–29%)
Uni- and bilateral multifocal epileptiform discharges	Sometimes (5–29%)
Dystonia	Rarely (1–4%)
Absent speech development	Not recorded
Clonus	Not recorded
Inability to walk	Not recorded
IQ less than 20	Not recorded
Multifocal epileptiform discharges	Not recorded
Poor eye contact	Not recorded

Abnormality of head or neck

Trait	How often it is seen
Abnormally small head	Rarely (1–4%)
Cleft palate	Rarely (1–4%)
Depressed nasal bridge	Rarely (1–4%)
Nasal tip, upturned	Rarely (1–4%)
Sloping forehead	Rarely (1–4%)
Decreased head circumference	Not recorded

Abnormality of the musculoskeletal system

Trait	How often it is seen
Double-Jointed	Always
Decreased muscle tone in infant	Often (30–79%)
Poor head control	Often (30–79%)
Involuntary muscle stiffness, contraction, or spasm	Sometimes (5–29%)
Flexed joint that cannot be straightened	Not recorded
Low muscle tone in trunk	Not recorded

Abnormality of limbs

Trait	How often it is seen
Broad finger	Rarely (1–4%)
Short finger	Rarely (1–4%)
Wide toe bones	Rarely (1–4%)
Increased muscle tone of arm or leg	Not recorded

Abnormality of the digestive system

Trait	How often it is seen
Feeding difficulties	Often (30–79%)
Poor suck	Often (30–79%)
Poor swallowing	Often (30–79%)
Umbilical hernia	Rarely (1–4%)

Abnormality of the genitourinary system

Trait	How often it is seen
Renal dysplasia	Rarely (1–4%)
Short penis	Rarely (1–4%)
Ureterocele	Rarely (1–4%)

Abnormality of the eye

Trait	How often it is seen
Cross-eyed	Rarely (1–4%)
Cerebral visual impairment	Not recorded

Growth abnormality

Trait	How often it is seen
Faltering weight	Rarely (1–4%)
Growth delay	Not recorded

Abnormality of the cardiovascular system

Trait	How often it is seen
Hole in heart wall separating two lower heart chambers	Rarely (1–4%)

Abnormality of the endocrine system

Trait	How often it is seen
Early onset of puberty	Rarely (1–4%)

Abnormality of the immune system

Trait	How often it is seen
Recurrent respiratory infections	Often (30–79%)

Abnormality of the integument

Trait	How often it is seen
Absent thumbnail	Rarely (1–4%)

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

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