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RASA1

Synonyms
CM-AVM, CMAVM, CMAVM1, GAP, PKWS, RASA, RASGAP, p120, p120GAP, p120RASGAP
External resources
Summary
The protein encoded by this gene is located in the cytoplasm and is part of the GAP1 family of GTPase-activating proteins. The gene product stimulates the GTPase activity of normal RAS p21 but not its oncogenic counterpart. Acting as a suppressor of RAS function, the protein enhances the weak intrinsic GTPase activity of RAS proteins resulting in the inactive GDP-bound form of RAS, thereby allowing control of cellular proliferation and differentiation. Mutations leading to changes in the binding sites of either protein are associated with basal cell carcinomas. Mutations also have been associated with hereditary capillary malformations (CM) with or without arteriovenous malformations (AVM) and Parkes Weber syndrome. Alternative splicing results in two isoforms where the shorter isoform, lacking the N-terminal hydrophobic region but retaining the same activity, appears to be abundantly expressed in placental but not adult tissues.

Variant counts

The variants found in rare patients tested by 3billion are classified and counted according to ACMG guidelines. The variants with over 5% variant frequency in population genome databases ( gnomAD, dbSNP, etc) are excluded.

Pathogenic
4
Likely pathogenic
0
VUS
1,756
Likely benign
29,107
Benign
2,623

Patient phenotypes

Proportions of phenotypes among 4 patients carrying pathogenic or likely pathogenic variants on RASA1 gene are displayed below.

Phenotype class
Patients in 3billion (%)
Abnormality of head or neck
50%
Abnormality of the cardiovascular system
50%
Abnormality of the musculoskeletal system
50%
Abnormality of the nervous system
50%
Abnormality of prenatal development or birth
25%
Abnormality of the eye
25%
Abnormality of the integument
25%
Constitutional symptom
25%
Abnormal cellular phenotype
0%
Abnormality of blood and blood-forming tissues
0%
Abnormality of limbs
0%
Abnormality of metabolism homeostasis
0%
Abnormality of the breast
0%
Abnormality of the digestive system
0%
Abnormality of the ear
0%
Abnormality of the endocrine system
0%
Abnormality of the genitourinary system
0%
Abnormality of the immune system
0%
Abnormality of the respiratory system
0%
Abnormality of the thoracic cavity
0%
Abnormality of the voice
0%
Growth abnormality
0%
Neoplasm
0%

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