Variant 12-22201981-G-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_003034.4(ST8SIA1):c.642C>A(p.Asn214Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,378 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

ST8SIA1
NM_003034.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.80

Variant links:

Genes affected

ST8SIA1 (HGNC:10869): (ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 1) Gangliosides are membrane-bound glycosphingolipids containing sialic acid. Ganglioside GD3 is known to be important for cell adhesion and growth of cultured malignant cells. The protein encoded by this gene is a type II membrane protein that catalyzes the transfer of sialic acid from CMP-sialic acid to GM3 to produce gangliosides GD3 and GT3. The encoded protein may be found in the Golgi apparatus and is a member of glycosyltransferase family 29. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jan 2015]

ST8SIA1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a glycosylation_site N-linked (GlcNAc...) asparagine (size 0) in uniprot entity SIA8A_HUMAN

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.24608108).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ST8SIA1	NM_003034.4 linkuse as main transcript	c.642C>A	p.Asn214Lys	missense_variant	5/5	ENST00000396037.9	NP_003025.1
ST8SIA1	NM_001304450.2 linkuse as main transcript	c.213C>A	p.Asn71Lys	missense_variant	4/4		NP_001291379.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ST8SIA1	ENST00000396037.9 linkuse as main transcript	c.642C>A	p.Asn214Lys	missense_variant	5/5	1	NM_003034.4	ENSP00000379353	P1	Q92185-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000806

AC:

AN:

248080

Hom.:

AF XY:

0.00

AC XY:

AN XY:

134296

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000581

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461378

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

726986

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000672

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 27, 2023

The c.642C>A (p.N214K) alteration is located in exon 5 (coding exon 5) of the ST8SIA1 gene. This alteration results from a C to A substitution at nucleotide position 642, causing the asparagine (N) at amino acid position 214 to be replaced by a lysine (K). 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

0.15

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.59

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.12

T;.

Eigen

Benign

-0.10

Eigen_PC

Benign

0.058

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.74

T;T

M_CAP

Benign

0.0095

MetaRNN

Benign

0.25

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.55

N;.

MutationTaster

Benign

0.96

D;D

PrimateAI

Uncertain

0.69

PROVEAN

Benign

-1.4

N;N

REVEL

Benign

0.053

Sift

Benign

0.064

T;T

Sift4G

Benign

0.20

T;.

Polyphen

0.026

B;.

Vest4

0.46

MutPred

0.59

Gain of methylation at N214 (P = 0.0099);.;

MVP

0.47

MPC

0.52

ClinPred

0.32

GERP RS

3.9

Varity_R

0.12

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over