18-31684417-G-A

Position:

chr18-31684417-G-A

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_004775.5(B4GALT6):c.10C>T(p.Leu4Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,613,482 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 30)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

B4GALT6
NM_004775.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.33

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.11043981).

BS2

High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B4GALT6	NM_004775.5 linkuse as main transcript	c.10C>T	p.Leu4Phe	missense_variant	1/9	ENST00000306851.10	NP_004766.2	Q9UBX8-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
B4GALT6	ENST00000306851.10 linkuse as main transcript	c.10C>T	p.Leu4Phe	missense_variant	1/9	1	NM_004775.5	ENSP00000306459.5	Q9UBX8-1
B4GALT6	ENST00000237019.11 linkuse as main transcript	c.10C>T	p.Leu4Phe	missense_variant	1/8	1		ENSP00000237019.7	G3XA83
B4GALT6	ENST00000383131.3 linkuse as main transcript	c.10C>T	p.Leu4Phe	missense_variant	1/8	1		ENSP00000372613.3	Q9UBX8-2
B4GALT6	ENST00000579372.1 linkuse as main transcript	c.-18+1313C>T		intron_variant		5		ENSP00000463961.1	J3QQY9

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152052

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

250722

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135632

show subpopulations

Gnomad AFR exome

AF:

0.000248

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:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461430

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727024

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

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:

0.00000180

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152052

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74270

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000986

Hom.:

Bravo

AF:

0.0000529

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

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

Aug 19, 2023

The c.10C>T (p.L4F) alteration is located in exon 1 (coding exon 1) of the B4GALT6 gene. This alteration results from a C to T substitution at nucleotide position 10, causing the leucine (L) at amino acid position 4 to be replaced by a phenylalanine (F). 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

0.048

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.33

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.17

T;T;.

Eigen

Benign

0.0034

Eigen_PC

Benign

0.17

FATHMM_MKL

Benign

0.60

LIST_S2

Benign

0.83

T;T;T

M_CAP

Benign

0.025

MetaRNN

Benign

0.11

T;T;T

MetaSVM

Benign

-0.73

MutationAssessor

Benign

-0.20

N;.;N

PrimateAI

Uncertain

0.53

PROVEAN

Benign

-0.73

N;N;N

REVEL

Benign

0.084

Sift

Benign

0.031

D;D;D

Sift4G

Benign

0.64

T;T;T

Polyphen

0.0

B;D;.

Vest4

0.18

MVP

0.28

MPC

0.62

ClinPred

0.12

GERP RS

5.1

Varity_R

0.30

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

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