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SPTLC1

Synonyms
HSAN1, HSN1, LBC1, LCB1, SPT1, SPTI
External resources
Summary
This gene encodes a member of the class-II pyridoxal-phosphate-dependent aminotransferase family. The encoded protein is the long chain base subunit 1 of serine palmitoyltransferase. Serine palmitoyltransferase converts L-serine and palmitoyl-CoA to 3-oxosphinganine with pyridoxal 5'-phosphate and is the key enzyme in sphingolipid biosynthesis. Mutations in this gene were identified in patients with hereditary sensory neuropathy type 1. Alternatively spliced variants encoding different isoforms have been identified. Pseudogenes of this gene have been defined on chromosomes 1, 6, 10, and 13.

Variant counts

Variant classification counts according to ACMG guideline on all identified variants among our tested samples are listed. The variants with over 5% variant frequency in population genome databases ( gnomAD, dbSNP, etc) are excluded.

Pathogenic
5
Likely pathogenic
0
VUS
721
Likely benign
1,752
Benign
6,809

Patient phenotypes

Proportions of phenotypes among 5 patients carring pathogenic or likely pathogenic variants on SPTLC1 gene are displayed below.

Phenotype class
Patients in 3billion (%)
Abnormality of the eye
40%
Abnormality of the musculoskeletal system
40%
Abnormality of the nervous system
40%
Abnormality of head or neck
20%
Abnormality of the immune system
20%
Abnormality of the integument
20%
Constitutional symptom
20%
Growth abnormality
20%
Abnormal cellular phenotype
0%
Abnormality of blood and blood-forming tissues
0%
Abnormality of limbs
0%
Abnormality of metabolism homeostasis
0%
Abnormality of prenatal development or birth
0%
Abnormality of the breast
0%
Abnormality of the cardiovascular system
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 respiratory system
0%
Abnormality of the thoracic cavity
0%
Abnormality of the voice
0%
Neoplasm
0%

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