chr9-33111250-CAAAA-C

Position:

• chr9-33111250-CAAAA-C

Variant summary

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

The NM_001497.4(B4GALT1):​c.*2200_*2203del variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.40 (319 hom., cov: 0)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: B4GALT1 NM_001497.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.53

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B4GALT1	NM_001497.4	c.*2200_*2203del		3_prime_UTR_variant	6/6	ENST00000379731.5	NP_001488.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
B4GALT1	ENST00000379731.5	c.*2200_*2203del		3_prime_UTR_variant	6/6	1	NM_001497.4	ENSP00000369055	P1
B4GALT1	ENST00000535206.5	c.649-6473_649-6470del		intron_variant		1		ENSP00000440341

Frequencies

GnomAD3 genomes AF: 0.00 AC: 18437 AN: 46040 Hom.: 322 Cov.: 0 FAILED QC

Gnomad AFR AF: 0.246

Gnomad AMI AF: 0.467

Gnomad AMR AF: 0.458

Gnomad ASJ AF: 0.441

Gnomad EAS AF: 0.364

Gnomad SAS AF: 0.426

Gnomad FIN AF: 0.397

Gnomad MID AF: 0.379

Gnomad NFE AF: 0.432

Gnomad OTH AF: 0.420

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 270 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 174

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR;InbreedingCoeff AF: 0.400 AC: 18429 AN: 46068 Hom.: 319 Cov.: 0 AF XY: 0.394 AC XY: 7874 AN XY: 20004

Gnomad4 AFR AF: 0.245

Gnomad4 AMR AF: 0.457

Gnomad4 ASJ AF: 0.441

Gnomad4 EAS AF: 0.363

Gnomad4 SAS AF: 0.425

Gnomad4 FIN AF: 0.397

Gnomad4 NFE AF: 0.432

Gnomad4 OTH AF: 0.416

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Congenital disorder of glycosylation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Computational scores

Source: dbNSFP v4.3

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

Other links and lift over

dbSNP: rs751351046; hg19: chr9-33111248;