1-43736342-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_006279.5(ST3GAL3):c.80C>T(p.Ala27Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,870 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A27A) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

ST3GAL3
NM_006279.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.74

Variant links:

Genes affected

ST3GAL3 (HGNC:10866): (ST3 beta-galactoside alpha-2,3-sialyltransferase 3) The protein encoded by this gene is a type II membrane protein that catalyzes the transfer of sialic acid from CMP-sialic acid to galactose-containing substrates. The encoded protein is normally found in the Golgi apparatus but can be proteolytically processed to a soluble form. This protein is a member of glycosyltransferase family 29. Mutations in this gene have been associated with a form of autosomal recessive nonsymdromic cognitive disability as well as infantile epileptic encephalopathy. Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

ST3GAL3 links:

ENSG00000284989 (HGNC:):

ENSG00000284989 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.4189244).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ST3GAL3	NM_006279.5 link	c.80C>T	p.Ala27Val	missense_variant	Exon 2 of 12	ENST00000347631.8	NP_006270.1	Q11203-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ST3GAL3	ENST00000347631.8 link	c.80C>T	p.Ala27Val	missense_variant	Exon 2 of 12	5	NM_006279.5	ENSP00000317192.6	Q11203-1
ENSG00000284989	ENST00000645057.1 link	n.*1402C>T		non_coding_transcript_exon_variant	Exon 16 of 26			ENSP00000494063.1	A0A2R8Y4U1
ENSG00000284989	ENST00000645057.1 link	n.*1402C>T		3_prime_UTR_variant	Exon 16 of 26			ENSP00000494063.1	A0A2R8Y4U1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251480

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135916

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461870

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727238

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:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Early infantile epileptic encephalopathy with suppression bursts

Uncertain:1

Feb 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 27 of the ST3GAL3 protein (p.Ala27Val). This variant is present in population databases (rs751825349, gnomAD 0.0009%). This missense change has been observed in individual(s) with autism (PMID: 35982160). ClinVar contains an entry for this variant (Variation ID: 941994). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Uncertain

0.056

BayesDel_noAF

Benign

-0.16

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.094

T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;.;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.

Eigen

Benign

0.11

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.84

.;T;T;D;T;D;T;D;D;D;D;T;D;D;D;.;D;D;D;D;D;D;D;D;D;T;D;D;D;D;.;D;.;.;D;D

M_CAP

Benign

0.078

MetaRNN

Benign

0.28

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.21

MutationAssessor

Benign

1.8

L;L;L;L;L;L;L;.;.;.;L;.;L;L;L;L;.;L;.;.;.;L;.;.;L;L;L;L;L;L;L;L;L;L;.;.

PrimateAI

Uncertain

0.70

PROVEAN

Benign

-0.94

N;N;N;D;D;N;N;.;.;.;N;.;N;.;N;.;.;N;.;N;.;.;N;.;D;D;N;N;N;N;D;N;D;N;.;.

REVEL

Benign

0.11

Sift

Uncertain

0.0030

D;D;T;D;D;T;T;.;.;.;D;.;D;.;D;.;.;D;.;D;.;.;D;.;D;D;D;T;D;T;D;D;D;T;.;.

Sift4G

Uncertain

0.0090

D;D;T;D;D;D;T;.;.;.;T;.;T;.;D;.;.;D;.;D;.;.;D;.;D;D;T;D;D;D;D;T;D;D;.;.

Polyphen

0.015

B;B;B;.;P;B;B;.;.;.;.;.;B;B;D;B;.;D;.;.;.;B;.;.;P;P;B;D;.;B;P;B;.;B;.;.

Vest4

0.57

MutPred

0.40

Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);Gain of methylation at K29 (P = 0.0829);.;.;

MVP

0.39

MPC

1.4

ClinPred

0.98

GERP RS

5.0

Varity_R

0.23

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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