Variant 18-31626295-T-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004775.5(B4GALT6):c.989A>G(p.Gln330Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000699 in 1,430,562 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

B4GALT6
NM_004775.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.02

Variant links:

Genes affected

B4GALT6 (HGNC:929): (beta-1,4-galactosyltransferase 6) This gene is one of seven beta-1,4-galactosyltransferase (beta4GalT) genes in human. 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. This gene produces multiple protein isoforms - some of which are predicted to lack the N-terminal hydrophobic signal sequence and transmembrane domain. By sequence similarity, the beta4GalTs form four groups: beta4GalT1 and beta4GalT2, beta4GalT3 and beta4GalT4, beta4GalT5 and beta4GalT6, and beta4GalT7. The canonical enzyme encoded by this gene is a lactosylceramide synthase important for glycolipid biosynthesis. [provided by RefSeq, Jan 2020]

B4GALT6 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B4GALT6	NM_004775.5 linkuse as main transcript	c.989A>G	p.Gln330Arg	missense_variant	8/9	ENST00000306851.10	NP_004766.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
B4GALT6	ENST00000306851.10 linkuse as main transcript	c.989A>G	p.Gln330Arg	missense_variant	8/9	1	NM_004775.5	ENSP00000306459	P1	Q9UBX8-1
B4GALT6	ENST00000237019.11 linkuse as main transcript	c.872A>G	p.Gln291Arg	missense_variant	7/8	1		ENSP00000237019
B4GALT6	ENST00000383131.3 linkuse as main transcript	c.872A>G	p.Gln291Arg	missense_variant	7/8	1		ENSP00000372613		Q9UBX8-2
B4GALT6	ENST00000578114.1 linkuse as main transcript	n.900A>G		non_coding_transcript_exon_variant	4/5	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.99e-7

AC:

AN:

1430562

Hom.:

Cov.:

AF XY:

0.00000141

AC XY:

AN XY:

711534

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:

9.15e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

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

Jan 23, 2024

The c.989A>G (p.Q330R) alteration is located in exon 8 (coding exon 8) of the B4GALT6 gene. This alteration results from a A to G substitution at nucleotide position 989, causing the glutamine (Q) at amino acid position 330 to be replaced by an arginine (R). 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

0.92

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.020

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.29

T;T;.

Eigen

Pathogenic

0.73

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.89

D;D;D

M_CAP

Benign

0.034

MetaRNN

Uncertain

0.62

D;D;D

MetaSVM

Benign

-0.67

MutationAssessor

Pathogenic

3.2

M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-1.8

N;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.0030

D;D;D

Sift4G

Benign

0.18

T;T;T

Polyphen

0.89

P;P;.

Vest4

0.74

MutPred

0.47

Gain of MoRF binding (P = 0.0106);.;.;

MVP

0.33

MPC

0.66

ClinPred

0.97

GERP RS

5.8

Varity_R

0.36

gMVP

0.95

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