chr3-161101213-G-A

Position:

• chr3-161101213-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP6

The NM_003781.4(B3GALNT1):​c.-109C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000479 in 1,289,898 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (no stars).

• Frequency:
  • Genomes: 𝑓 0.0024 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00022 (0 hom.)
• Consequence: B3GALNT1 NM_003781.4 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Likely benign no assertion criteria provided B:1
• Conservation: PhyloP100: -3.04

Genes affected

B3GALNT1 (HGNC:918): (beta-1,3-N-acetylgalactosaminyltransferase 1 (Globoside blood group)) This gene is a member of the beta-1,3-galactosyltransferase (beta3GalT) gene family. This family encodes type II membrane-bound glycoproteins with diverse enzymatic functions using different donor substrates (UDP-galactose and UDP-N-acetylglucosamine) and different acceptor sugars (N-acetylglucosamine, galactose, N-acetylgalactosamine). The beta3GalT genes are distantly related to the Drosophila Brainiac gene and have the protein coding sequence contained in a single exon. The beta3GalT proteins also contain conserved sequences not found in the beta4GalT or alpha3GalT proteins. The carbohydrate chains synthesized by these enzymes are designated as type 1, whereas beta4GalT enzymes synthesize type 2 carbohydrate chains. The ratio of type 1:type 2 chains changes during embryogenesis. By sequence similarity, the beta3GalT genes fall into at least two groups: beta3GalT4 and 4 other beta3GalT genes (beta3GalT1-3, beta3GalT5). The encoded protein of this gene does not use N-acetylglucosamine as an acceptor sugar at all. [provided by RefSeq, Mar 2017]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0039470196).
• BP6: Variant 3-161101213-G-A is Benign according to our data. Variant chr3-161101213-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 3038902.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
B3GALNT1	NM_003781.4	c.-109C>T		5_prime_UTR_premature_start_codon_gain_variant	4/5	ENST00000320474.10	NP_003772.1
B3GALNT1	NM_003781.4	c.-109C>T		5_prime_UTR_variant	4/5	ENST00000320474.10	NP_003772.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
B3GALNT1	ENST00000320474.10	c.-109C>T		5_prime_UTR_premature_start_codon_gain_variant	4/5	1	NM_003781.4	ENSP00000323479.4
B3GALNT1	ENST00000320474.10	c.-109C>T		5_prime_UTR_variant	4/5	1	NM_003781.4	ENSP00000323479.4

Frequencies

GnomAD3 genomes AF: 0.00241 AC: 366 AN: 152164 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00835

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000851

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: 0.0000441

Gnomad OTH AF: 0.00192

GnomAD3 exomes AF: 0.000416 AC: 57 AN: 136888 Hom.: 0 AF XY: 0.000269 AC XY: 20 AN XY: 74344

Gnomad AFR exome AF: 0.00736

Gnomad AMR exome AF: 0.000327

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000445

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000240

GnomAD4 exome AF: 0.000216 AC: 246 AN: 1137616 Hom.: 0 Cov.: 31 AF XY: 0.000186 AC XY: 104 AN XY: 558094

Gnomad4 AFR exome AF: 0.00799

Gnomad4 AMR exome AF: 0.000354

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000779

Gnomad4 SAS exome AF: 0.0000656

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000119

Gnomad4 OTH exome AF: 0.000530

GnomAD4 genome AF: 0.00244 AC: 372 AN: 152282 Hom.: 0 Cov.: 32 AF XY: 0.00235 AC XY: 175 AN XY: 74458

Gnomad4 AFR AF: 0.00845

Gnomad4 AMR AF: 0.000850

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.000296 Hom.: 0

Bravo AF: 0.00259

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ExAC AF: 0.000243 AC: 5

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

Submissions by phenotype

B3GALNT1-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 22, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.57	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	0.058
DANN	Benign	0.73
Eigen	Benign	-2.2
Eigen_PC	Benign	-2.5
FATHMM_MKL	Benign	0.0067	N
MetaRNN	Benign	0.0039	T
MetaSVM	Benign	-0.94	T
PROVEAN	Benign	-0.42	N
REVEL	Benign	0.026
Sift	Pathogenic	0.0	D
MVP		0.22
ClinPred		0.0090	T
GERP RS		-5.9

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

Other links and lift over

dbSNP: rs34798602; hg19: chr3-160819001;