Genetic Variant GBGT1:p.Arg194Thr (chr9-133154040-C-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_021996.6(GBGT1):c.581G>C(p.Arg194Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,613,668 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

GBGT1
NM_021996.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.622

Variant links:

Genes affected

GBGT1 (HGNC:20460): (globoside alpha-1,3-N-acetylgalactosaminyltransferase 1 (FORS blood group)) This gene encodes a glycosyltransferase that plays a role in the synthesis of Forssman glycolipid (FG), a member of the globoseries glycolipid family. Glycolipids such as FG form attachment sites for the binding of pathogens to cells; expression of this protein may determine host tropism to microorganisms. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

GBGT1 links:

ENSG00000285245 (HGNC:):

ENSG00000285245 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.04511732).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GBGT1	NM_021996.6 link	c.581G>C	p.Arg194Thr	missense_variant	Exon 7 of 7	ENST00000372040.9	NP_068836.2	Q8N5D6-1J7Q0Z1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GBGT1	ENST00000372040.9 link	c.581G>C	p.Arg194Thr	missense_variant	Exon 7 of 7	1	NM_021996.6	ENSP00000361110.3		Q8N5D6-1
ENSG00000285245	ENST00000647146.1 link	c.396+1138G>C		intron_variant	Intron 6 of 22			ENSP00000493691.1		A0A2R8Y471

Frequencies

GnomAD3 genomes

AF:

0.000131

AC:

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000359

AC:

AN:

250994

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135836

show subpopulations

Gnomad AFR exome

AF:

0.000555

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1461448

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

727018

show subpopulations

Gnomad4 AFR exome

AF:

0.000568

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:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000131

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74360

show subpopulations

Gnomad4 AFR

AF:

0.000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.000227

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 26, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.581G>C (p.R194T) alteration is located in exon 7 (coding exon 6) of the GBGT1 gene. This alteration results from a G to C substitution at nucleotide position 581, causing the arginine (R) at amino acid position 194 to be replaced by a threonine (T). 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

0.074

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.63

CADD

Benign

7.2

DANN

Benign

0.89

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.13

LIST_S2

Benign

0.40

M_CAP

Benign

0.0053

MetaRNN

Benign

0.045

MetaSVM

Benign

-0.96

PROVEAN

Benign

1.7

REVEL

Benign

0.053

Sift

Pathogenic

0.0

Vest4

0.21

MutPred

0.48

Gain of helix (P = 0.0117);

MVP

0.18

ClinPred

0.025

GERP RS

0.92

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

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