9-33113301-G-A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS2

The NM_001497.4(B4GALT1):c.*153C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00885 in 1,174,346 control chromosomes in the GnomAD database, including 53 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0077 (6 hom., cov: 33)
  • Exomes 𝑓: 0.0090 (47 hom.)
• Consequence: B4GALT1 NM_001497.4 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.0790

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 Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 9-33113301-G-A is Benign according to our data. Variant chr9-33113301-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 1321615.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High Homozygotes in GnomAd at 6 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
B4GALT1	NM_001497.4	c.*153C>T		3_prime_UTR_variant	6/6	ENST00000379731.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
B4GALT1	ENST00000379731.5	c.*153C>T		3_prime_UTR_variant	6/6	1	NM_001497.4	P1
B4GALT1	ENST00000535206.5	c.649-8520C>T		intron_variant		1

Frequencies

GnomAD3 genomes AF: 0.00768 AC: 1169 AN: 152152 Hom.: 6 Cov.: 33

Gnomad AFR AF: 0.00391

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00734

Gnomad ASJ AF: 0.00663

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00393

Gnomad FIN AF: 0.0188

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00944

Gnomad OTH AF: 0.00526

GnomAD4 exome AF: 0.00902 AC: 9217 AN: 1022076 Hom.: 47 Cov.: 13 AF XY: 0.00910 AC XY: 4761 AN XY: 523046

Gnomad4 AFR exome AF: 0.00381

Gnomad4 AMR exome AF: 0.00558

Gnomad4 ASJ exome AF: 0.00692

Gnomad4 EAS exome AF: 0.0000546

Gnomad4 SAS exome AF: 0.00463

Gnomad4 FIN exome AF: 0.0141

Gnomad4 NFE exome AF: 0.00998

Gnomad4 OTH exome AF: 0.00925

GnomAD4 genome AF: 0.00769 AC: 1171 AN: 152270 Hom.: 6 Cov.: 33 AF XY: 0.00798 AC XY: 594 AN XY: 74456

Gnomad4 AFR AF: 0.00392

Gnomad4 AMR AF: 0.00733

Gnomad4 ASJ AF: 0.00663

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00393

Gnomad4 FIN AF: 0.0188

Gnomad4 NFE AF: 0.00944

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.00855 Hom.: 0

Bravo AF: 0.00680

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

May 14, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
Cadd	Benign	11
Dann	Benign	0.83
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs149800125; hg19: chr9-33113299;