Genetic Variant ST6GALNAC3:p.Met193Thr (chr1-76412372-T-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_152996.4(ST6GALNAC3):c.578T>C(p.Met193Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000024 in 1,458,296 control chromosomes in the GnomAD database, with no homozygous occurrence. 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)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

ST6GALNAC3
NM_152996.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.65

Variant links:

Genes affected

ST6GALNAC3 (HGNC:19343): (ST6 N-acetylgalactosaminide alpha-2,6-sialyltransferase 3) ST6GALNAC3 belongs to a family of sialyltransferases that transfer sialic acids from CMP-sialic acid to terminal positions of carbohydrate groups in glycoproteins and glycolipids (Lee et al., 1999 [PubMed 10207017]).[supplied by OMIM, Mar 2008]

ST6GALNAC3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ST6GALNAC3	NM_152996.4 link	c.578T>C	p.Met193Thr	missense_variant	Exon 3 of 5	ENST00000328299.4	NP_694541.2	Q8NDV1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ST6GALNAC3	ENST00000328299.4 link	c.578T>C	p.Met193Thr	missense_variant	Exon 3 of 5	1	NM_152996.4	ENSP00000329214.3		Q8NDV1-1
ST6GALNAC3	ENST00000464140.1 link	n.452T>C		non_coding_transcript_exon_variant	Exon 2 of 3	1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000281

AC:

AN:

249430

Hom.:

AF XY:

0.0000371

AC XY:

AN XY:

134848

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000533

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.0000240

AC:

AN:

1458296

Hom.:

Cov.:

AF XY:

0.0000221

AC XY:

AN XY:

725174

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.0000315

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 07, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.578T>C (p.M193T) alteration is located in exon 3 (coding exon 3) of the ST6GALNAC3 gene. This alteration results from a T to C substitution at nucleotide position 578, causing the methionine (M) at amino acid position 193 to be replaced by a threonine (T). 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

Pathogenic

0.97

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.16

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.14

T;T

Eigen

Pathogenic

0.71

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.83

T;T

M_CAP

Benign

0.030

MetaRNN

Pathogenic

0.89

D;D

MetaSVM

Benign

-0.72

MutationAssessor

Pathogenic

3.1

M;.

PrimateAI

Uncertain

0.75

PROVEAN

Pathogenic

-5.2

D;.

REVEL

Uncertain

0.61

Sift

Uncertain

0.0010

D;.

Sift4G

Uncertain

0.0020

D;D

Polyphen

0.93

P;.

Vest4

0.95

MutPred

0.75

Gain of sheet (P = 0.0827);.;

MVP

0.34

MPC

0.39

ClinPred

0.90

GERP RS

6.0

Varity_R

0.81

gMVP

0.92

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