Genetic Variant GCNT3:p.Arg194Trp (chr15-59618818-C-T) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_004751.3(GCNT3):c.580C>T(p.Arg194Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,614,038 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R194L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000023 ( 1 hom. )

Consequence

GCNT3
NM_004751.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.0540

Variant links:

Genes affected

GCNT3 (HGNC:4205): (glucosaminyl (N-acetyl) transferase 3, mucin type) This gene encodes a member of the N-acetylglucosaminyltransferase family. The encoded protein is a beta-6-N-acetylglucosamine-transferase that catalyzes the formation of core 2 and core 4 O-glycans on mucin-type glycoproteins.[provided by RefSeq, Apr 2009]

GCNT3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.26533332).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCNT3	NM_004751.3 link	c.580C>T	p.Arg194Trp	missense_variant	Exon 3 of 3	ENST00000396065.3	NP_004742.1	O95395A0A024R5T9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GCNT3	ENST00000396065.3 link	c.580C>T	p.Arg194Trp	missense_variant	Exon 3 of 3	1	NM_004751.3	ENSP00000379377.1	O95395
GCNT3	ENST00000560585.5 link	c.580C>T	p.Arg194Trp	missense_variant	Exon 3 of 3	1		ENSP00000452741.1	O95395
GCNT3	ENST00000560210.1 link	n.351+1937C>T		intron_variant	Intron 1 of 1	3
GCNT3	ENST00000559200.1 link	c.*121C>T		downstream_gene_variant		2		ENSP00000453774.1	H0YMW7

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251384

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135844

show subpopulations

Gnomad AFR exome

AF:

0.00

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:

0.0000264

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000233

AC:

AN:

1461878

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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:

0.0000374

Gnomad4 NFE exome

AF:

0.0000216

Gnomad4 OTH exome

AF:

0.0000993

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000416

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 13, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.580C>T (p.R194W) alteration is located in exon 3 (coding exon 1) of the GCNT3 gene. This alteration results from a C to T substitution at nucleotide position 580, causing the arginine (R) at amino acid position 194 to be replaced by a tryptophan (W). 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

0.17

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.59

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.20

T;T

Eigen

Benign

-0.32

Eigen_PC

Benign

-0.46

FATHMM_MKL

Benign

0.098

LIST_S2

Uncertain

0.93

.;D

M_CAP

Benign

0.0088

MetaRNN

Benign

0.27

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.1

M;M

PrimateAI

Benign

0.31

PROVEAN

Uncertain

-3.3

D;D

REVEL

Benign

0.027

Sift

Uncertain

0.0060

D;D

Sift4G

Uncertain

0.012

D;D

Polyphen

1.0

D;D

Vest4

0.38

MVP

0.25

ClinPred

0.88

GERP RS

0.47

Varity_R

0.21

gMVP

0.49

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