Variant chr1-43981209-C-A details in Genebe, Genetics Data Aggregator

Variant summary

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

The NM_003780.5(B4GALT2):c.49C>A(p.Leu17Ile) variant causes a missense change. The variant allele was found at a frequency of 0.0000062 in 1,451,226 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 (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

B4GALT2
NM_003780.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.60

Variant links:

Genes affected

B4GALT2 (HGNC:925): (beta-1,4-galactosyltransferase 2) This gene is one of seven beta-1,4-galactosyltransferase (beta4GalT) genes. They encode type II membrane-bound glycoproteins that appear to have exclusive specificity for the donor substrate UDP-galactose; all transfer galactose in a beta1,4 linkage to similar acceptor sugars: GlcNAc, Glc, and Xyl. Each beta4GalT has a distinct function in the biosynthesis of different glycoconjugates and saccharide structures. As type II membrane proteins, they have an N-terminal hydrophobic signal sequence that directs the protein to the Golgi apparatus and which then remains uncleaved to function as a transmembrane anchor. By sequence similarity, the beta4GalTs form four groups: beta4GalT1 and beta4GalT2, beta4GalT3 and beta4GalT4, beta4GalT5 and beta4GalT6, and beta4GalT7. The enzyme encoded by this gene synthesizes N-acetyllactosamine in glycolipids and glycoproteins. Its substrate specificity is affected by alpha-lactalbumin but it is not expressed in lactating mammary tissue. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jul 2011]

B4GALT2 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=0.32343394).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
B4GALT2	NM_003780.5 linkuse as main transcript	c.49C>A	p.Leu17Ile	missense_variant	2/7	ENST00000372324.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
B4GALT2	ENST00000372324.6 linkuse as main transcript	c.49C>A	p.Leu17Ile	missense_variant	2/7	1	NM_003780.5	P1	O60909-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000620

AC:

AN:

1451226

Hom.:

Cov.:

AF XY:

0.00000692

AC XY:

AN XY:

722402

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:

0.00000809

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

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

Sep 26, 2023

The c.136C>A (p.L46I) alteration is located in exon 2 (coding exon 2) of the B4GALT2 gene. This alteration results from a C to A substitution at nucleotide position 136, causing the leucine (L) at amino acid position 46 to be replaced by an isoleucine (I). 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

0.29

BayesDel_addAF

Benign

-0.068

BayesDel_noAF

Benign

-0.34

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Benign

0.058

T;T;.

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.92

D;.;D

M_CAP

Benign

0.019

MetaRNN

Benign

0.32

T;T;T

MetaSVM

Benign

-0.76

MutationAssessor

Benign

0.69

N;N;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Pathogenic

0.87

PROVEAN

Benign

0.19

N;N;N

REVEL

Benign

0.12

Sift

Benign

0.15

T;T;T

Sift4G

Benign

0.13

T;T;T

Polyphen

0.36

B;B;.

Vest4

0.52

MutPred

0.36

Gain of catalytic residue at L22 (P = 0.1149);Gain of catalytic residue at L22 (P = 0.1149);.;

MVP

0.51

MPC

0.73

ClinPred

0.63

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.12

gMVP

0.54

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over