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SPAST

Synonyms
ADPSP, FSP2, SPG4
External resources
Summary
This gene encodes a member of the AAA (ATPases associated with a variety of cellular activities) protein family. Members of this protein family share an ATPase domain and have roles in diverse cellular processes including membrane trafficking, intracellular motility, organelle biogenesis, protein folding, and proteolysis. The use of alternative translational initiation sites in this gene results in a single transcript variant that can produce isoforms that differ in the length of their N-terminus and which thereby differ in the efficiency of their export from the nucleus to the cytoplasm. In addition, alternative splicing results in multiple transcript variants that encode isoforms that differ in other protein regions as well. One isoform of this gene has been shown to be a microtubule-severing enzyme that regulates microtubule abundance, mobility, and plus-end distribution. Mutations in this gene cause the most frequent form of autosomal dominant spastic paraplegia 4.

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
18
Likely pathogenic
3
VUS
12,328
Likely benign
4,596
Benign
314

Patient phenotypes

Proportions of phenotypes among 17 patients carrying pathogenic or likely pathogenic variants on SPAST gene are displayed below.

Phenotype class
Patients in 3billion (%)
Abnormality of the nervous system
70.6%
Abnormality of the musculoskeletal system
47.1%
Abnormality of head or neck
17.6%
Abnormality of the eye
11.8%
Abnormality of the genitourinary system
11.8%
Abnormality of prenatal development or birth
5.9%
Abnormality of the cardiovascular system
5.9%
Abnormality of the digestive system
5.9%
Abnormality of the ear
5.9%
Constitutional symptom
5.9%
Growth abnormality
5.9%
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 endocrine system
0%
Abnormality of the immune system
0%
Abnormality of the integument
0%
Abnormality of the respiratory system
0%
Abnormality of the thoracic cavity
0%
Abnormality of the voice
0%
Neoplasm
0%

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