1-235450222-C-T

Position:

chr1-235450222-C-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_152490.5(B3GALNT2):c.1487G>A(p.Arg496Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000458 in 1,614,102 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R496G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000041 ( 3 hom. )

Consequence

B3GALNT2
NM_152490.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.406

Variant links:

Genes affected

B3GALNT2 (HGNC:28596): (beta-1,3-N-acetylgalactosaminyltransferase 2) This gene encodes a member of the glycosyltransferase 31 family. The encoded protein synthesizes GalNAc:beta-1,3GlcNAc, a novel carbohydrate structure, on N- and O-glycans. Alternatively spliced transcript variants that encode different isoforms have been described. [provided by RefSeq, Mar 2013]

B3GALNT2 links:

TBCE (HGNC:11582): (tubulin folding cofactor E) Cofactor E is one of four proteins (cofactors A, D, E, and C) involved in the pathway leading to correctly folded beta-tubulin from folding intermediates. Cofactors A and D are believed to play a role in capturing and stabilizing beta-tubulin intermediates in a quasi-native confirmation. Cofactor E binds to the cofactor D/beta-tubulin complex; interaction with cofactor C then causes the release of beta-tubulin polypeptides that are committed to the native state. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

TBCE links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.014823884).

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B3GALNT2	NM_152490.5 linkuse as main transcript	c.1487G>A	p.Arg496Gln	missense_variant	12/12	ENST00000366600.8	NP_689703.1	Q8NCR0-1
TBCE	NM_003193.5 linkuse as main transcript	c.*1460C>T		3_prime_UTR_variant	17/17	ENST00000642610.2	NP_003184.1	Q15813-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
B3GALNT2	ENST00000366600.8 linkuse as main transcript	c.1487G>A	p.Arg496Gln	missense_variant	12/12	1	NM_152490.5	ENSP00000355559.3		Q8NCR0-1
TBCE	ENST00000642610.2 linkuse as main transcript	c.*1460C>T		3_prime_UTR_variant	17/17		NM_003193.5	ENSP00000494796.1		Q15813-1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000265

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251404

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135884

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000410

AC:

AN:

1461862

Hom.:

Cov.:

AF XY:

0.0000399

AC XY:

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.00102

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.000315

GnomAD4 genome

AF:

0.0000920

AC:

AN:

152240

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74436

show subpopulations

Gnomad4 AFR

AF:

0.000313

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000567

ExAC

AF:

0.0000247

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 11

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 06, 2023

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 496 of the B3GALNT2 protein (p.Arg496Gln). This variant is present in population databases (rs111541487, gnomAD 0.008%). This variant has not been reported in the literature in individuals affected with B3GALNT2-related conditions. ClinVar contains an entry for this variant (Variation ID: 473881). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt B3GALNT2 protein function with a negative predictive value of 80%. 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

0.064

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.65

CADD

Benign

4.4

DANN

Benign

0.81

DEOGEN2

Benign

0.016

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.085

M_CAP

Benign

0.0074

MetaRNN

Benign

0.015

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-1.9

PrimateAI

Benign

0.17

PROVEAN

Benign

0.020

REVEL

Benign

0.035

Sift

Benign

1.0

Sift4G

Benign

0.69

Polyphen

0.0

Vest4

0.031

MutPred

0.32

Loss of MoRF binding (P = 0.004);

MVP

0.23

MPC

0.28

ClinPred

0.036

GERP RS

-1.3

Varity_R

0.017

gMVP

0.45

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