Genetic Variant B3GNT4:p.Tyr173Cys (chr12-122206769-A-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_030765.4(B3GNT4):c.518A>G(p.Tyr173Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000317 in 1,606,792 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000030 ( 0 hom. )

Consequence

B3GNT4
NM_030765.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.83

Variant links:

Genes affected

B3GNT4 (HGNC:15683): (UDP-GlcNAc:betaGal beta-1,3-N-acetylglucosaminyltransferase 4) This gene encodes a member of the beta-1,3-N-acetylglucosaminyltransferase protein family. The encoded enzyme is involved in the biosynthesis of poly-N-acetyllactosamine chains and prefers lacto-N-neotetraose as a substrate. It is a type II transmembrane protein. [provided by RefSeq, Jul 2008]

B3GNT4 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 rank	MANE	Protein	UniProt
B3GNT4	NM_030765.4 link	c.518A>G	p.Tyr173Cys	missense_variant	Exon 3 of 3	ENST00000324189.5	NP_110392.1	Q9C0J1-1A0A024RBT1
B3GNT4	NM_001330492.2 link	c.443A>G	p.Tyr148Cys	missense_variant	Exon 2 of 2		NP_001317421.1	Q9C0J1-2
B3GNT4	XM_047429535.1 link	c.443A>G	p.Tyr148Cys	missense_variant	Exon 2 of 2		XP_047285491.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
B3GNT4	ENST00000324189.5 link	c.518A>G	p.Tyr173Cys	missense_variant	Exon 3 of 3	1	NM_030765.4	ENSP00000319636.4		Q9C0J1-1

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152138

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:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000326

AC:

AN:

245416

Hom.:

AF XY:

0.0000377

AC XY:

AN XY:

132732

show subpopulations

Gnomad AFR exome

AF:

0.000124

Gnomad AMR exome

AF:

0.0000293

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000101

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000903

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.0000296

AC:

AN:

1454654

Hom.:

Cov.:

AF XY:

0.0000346

AC XY:

AN XY:

722940

show subpopulations

Gnomad4 AFR exome

AF:

0.0000300

Gnomad4 AMR exome

AF:

0.0000451

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000152

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000208

Gnomad4 OTH exome

AF:

0.0000666

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74324

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:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000508

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 26, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.518A>G (p.Y173C) alteration is located in exon 3 (coding exon 2) of the B3GNT4 gene. This alteration results from a A to G substitution at nucleotide position 518, causing the tyrosine (Y) at amino acid position 173 to be replaced by a cysteine (C). 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

0.20

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.18

CADD

Uncertain

DANN

Uncertain

1.0

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Uncertain

0.95

LIST_S2

Benign

0.19

M_CAP

Benign

0.028

MetaRNN

Uncertain

0.50

ClinPred

0.86

GERP RS

4.7

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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