3-119229900-G-A

Position:

• chr3-119229900-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003778.4(B4GALT4):​c.200C>T​(p.Ala67Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,856 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: B4GALT4 NM_003778.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.25

Genes affected

B4GALT4 (HGNC:927): (beta-1,4-galactosyltransferase 4) 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 appears to mainly play a role in glycolipid biosynthesis. Two alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jul 2008]

B4GALT4-AS1 (HGNC:40090): (B4GALT4 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.078587174).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B4GALT4	NM_003778.4	c.200C>T	p.Ala67Val	missense_variant	3/8	ENST00000393765.7	NP_003769.1
B4GALT4-AS1	NR_046574.1	n.197-245G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
B4GALT4	ENST00000393765.7	c.200C>T	p.Ala67Val	missense_variant	3/8	1	NM_003778.4	ENSP00000377360	P1
B4GALT4-AS1	ENST00000470790.1	n.197-245G>A		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461856 Hom.: 0 Cov.: 32 AF XY: 0.00000550 AC XY: 4 AN XY: 727232

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: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 21, 2023

The c.200C>T (p.A67V) alteration is located in exon 4 (coding exon 1) of the B4GALT4 gene. This alteration results from a C to T substitution at nucleotide position 200, causing the alanine (A) at amino acid position 67 to be replaced by a valine (V). 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	0.071
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	7.0
DANN	Benign	0.95
DEOGEN2	Benign	0.011	T;T;T;T;T;T;.
Eigen	Benign	-0.77
Eigen_PC	Benign	-0.82
FATHMM_MKL	Benign	0.052	N
LIST_S2	Benign	0.66	.;T;T;.;T;T;T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.079	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.4	M;.;.;M;M;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-1.1	N;N;D;N;N;N;N
REVEL	Benign	0.040
Sift	Benign	0.25	T;T;D;T;T;T;T
Sift4G	Benign	0.31	T;T;D;T;T;.;.
Polyphen		0.0030	B;.;.;B;B;.;.
Vest4		0.036
MutPred		0.24		Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);.;Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);
MVP		0.53
MPC		0.48
ClinPred		0.069	T
GERP RS		2.3
Varity_R		0.017
gMVP		0.50

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.

Other links and lift over

hg19: chr3-118948747;