chr20-13074371-G-T

Variant names:

• chr20-13074371-G-T
• NM_018327.4:c.481G>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_018327.4(SPTLC3):​c.481G>T​(p.Asp161Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SPTLC3 NM_018327.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.93

Genes affected

SPTLC3 (HGNC:16253): (serine palmitoyltransferase long chain base subunit 3) This gene encodes a subunit of the serine palmitoyltransferase complex which catalyzes the rate-limiting step in sphingolipid biosynthesis. This subunit metabolizes lauroyl- and myristoyl-CoA and generates C14 and C16-sphingoid bases. [provided by RefSeq, Mar 2017]

ENSG00000271426 (HGNC:56949):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.802

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPTLC3	NM_018327.4	c.481G>T	p.Asp161Tyr	missense_variant	Exon 4 of 12	ENST00000399002.7	NP_060797.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPTLC3	ENST00000399002.7	c.481G>T	p.Asp161Tyr	missense_variant	Exon 4 of 12	1	NM_018327.4	ENSP00000381968.2
SPTLC3	ENST00000450297.1	c.400G>T	p.Asp134Tyr	missense_variant	Exon 4 of 5	3		ENSP00000409125.1
ENSG00000271426	ENST00000603234.1	n.-59C>A		upstream_gene_variant		6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Feb 03, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.481G>T (p.D161Y) alteration is located in exon 4 (coding exon 4) of the SPTLC3 gene. This alteration results from a G to T substitution at nucleotide position 481, causing the aspartic acid (D) at amino acid position 161 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.34	T;T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Uncertain	0.29	D
MetaRNN	Pathogenic	0.80	D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Uncertain	2.6	M;.
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-1.8	N;N
REVEL	Pathogenic	0.73
Sift	Uncertain	0.0090	D;D
Sift4G	Uncertain	0.012	D;D
Polyphen		1.0	D;.
Vest4		0.56
MutPred		0.62		Loss of sheet (P = 0.0457);.;
MVP		0.76
MPC		0.88
ClinPred		0.96	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.52
gMVP		0.74

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-13055019; COSMIC: COSV100982874; COSMIC: COSV100982874;