9-33166911-G-A

Position:

chr9-33166911-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The NM_001497.4(B4GALT1):c.259C>T(p.Pro87Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000314 in 1,576,632 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0016 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

B4GALT1
NM_001497.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:3

Conservation

PhyloP100: 0.894

Variant links:

Genes affected

B4GALT1 (HGNC:924): (beta-1,4-galactosyltransferase 1) 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. This gene is unique among the beta4GalT genes because it encodes an enzyme that participates both in glycoconjugate and lactose biosynthesis. For the first activity, the enzyme adds galactose to N-acetylglucosamine residues that are either monosaccharides or the nonreducing ends of glycoprotein carbohydrate chains. The second activity is restricted to lactating mammary tissues where the enzyme forms a heterodimer with alpha-lactalbumin to catalyze UDP-galactose + D-glucose <=> UDP + lactose. The two enzymatic forms result from alternate transcription initiation sites and post-translational processing. Two transcripts, which differ only at the 5' end, with approximate lengths of 4.1 kb and 3.9 kb encode the same protein. The longer transcript encodes the type II membrane-bound, trans-Golgi resident protein involved in glycoconjugate biosynthesis. The shorter transcript encodes a protein which is cleaved to form the soluble lactose synthase. [provided by RefSeq, Jul 2008]

B4GALT1 links:

B4GALT1-AS1 (HGNC:):

B4GALT1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.005222708).

BP6

Variant 9-33166911-G-A is Benign according to our data. Variant chr9-33166911-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 719722.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B4GALT1	NM_001497.4 linkuse as main transcript	c.259C>T	p.Pro87Ser	missense_variant	1/6	ENST00000379731.5	NP_001488.2	P15291-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
B4GALT1	ENST00000379731.5 linkuse as main transcript	c.259C>T	p.Pro87Ser	missense_variant	1/6	1	NM_001497.4	ENSP00000369055.4	P15291-1
B4GALT1	ENST00000535206.5 linkuse as main transcript	c.259C>T	p.Pro87Ser	missense_variant	1/3	1		ENSP00000440341.1	Q86XA6
B4GALT1-AS1	ENST00000654325.1 linkuse as main transcript	n.-37G>A		upstream_gene_variant

Frequencies

GnomAD3 genomes

AF:

0.00158

AC:

240

AN:

152234

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00564

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000284

AC:

AN:

186338

Hom.:

AF XY:

0.000233

AC XY:

AN XY:

103072

show subpopulations

Gnomad AFR exome

AF:

0.00437

Gnomad AMR exome

AF:

0.000140

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000368

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000122

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000178

AC:

254

AN:

1424282

Hom.:

Cov.:

AF XY:

0.000177

AC XY:

125

AN XY:

706454

show subpopulations

Gnomad4 AFR exome

AF:

0.00636

Gnomad4 AMR exome

AF:

0.000225

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000120

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000727

Gnomad4 OTH exome

AF:

0.000422

GnomAD4 genome

AF:

0.00158

AC:

241

AN:

152350

Hom.:

Cov.:

AF XY:

0.00152

AC XY:

113

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.00565

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000303

Hom.:

Bravo

AF:

0.00188

ESP6500AA

AF:

0.00376

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000473

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 06, 2023	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jun 07, 2023

Variant summary: B4GALT1 c.259C>T (p.Pro87Ser) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00028 in 186338 control chromosomes, with increased frequency in populations of African descent (0.0044 in 10762 control chromosomes). To our knowledge, no occurrence of c.259C>T in individuals affected with B4GALT1-CDG and no experimental evidence demonstrating its impact on protein function have been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Both laboratories classified the variant as likely benign. Based on the evidence outlined above, the variant was classified as uncertain significance. -

B4GALT1-congenital disorder of glycosylation

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Dec 08, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.065

BayesDel_addAF

Benign

-0.53

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.011

T;T

Eigen

Benign

-0.33

Eigen_PC

Benign

-0.31

FATHMM_MKL

Benign

0.092

LIST_S2

Benign

0.69

T;T

M_CAP

Benign

0.036

MetaRNN

Benign

0.0052

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

2.0

.;M

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-0.41

N;N

REVEL

Benign

0.034

Sift

Benign

0.057

T;T

Sift4G

Benign

0.49

T;T

Polyphen

0.22

.;B

Vest4

0.24

MVP

0.67

MPC

0.49

ClinPred

0.022

GERP RS

2.9

Varity_R

0.045

gMVP

0.42

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