3-43081313-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_032806.6(POMGNT2):c.119G>A(p.Arg40Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000125 in 1,612,052 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00034 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00010 ( 1 hom. )

Consequence

POMGNT2
NM_032806.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 1.63

Variant links:

Genes affected

POMGNT2 (HGNC:25902): (protein O-linked mannose N-acetylglucosaminyltransferase 2 (beta 1,4-)) This gene encodes a protein with glycosyltransferase activity although its function is not currently known. [provided by RefSeq, Sep 2012]

POMGNT2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.009429544).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000341 (52/152296) while in subpopulation AFR AF= 0.00106 (44/41566). AF 95% confidence interval is 0.00081. There are 0 homozygotes in gnomad4. There are 26 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POMGNT2	NM_032806.6 link	c.119G>A	p.Arg40Gln	missense_variant	Exon 2 of 2	ENST00000344697.3	NP_116195.2	Q8NAT1A0A024R2P4
POMGNT2	XM_005265515.4 link	c.119G>A	p.Arg40Gln	missense_variant	Exon 3 of 3		XP_005265572.1	Q8NAT1A0A024R2P4
POMGNT2	XM_011534163.3 link	c.119G>A	p.Arg40Gln	missense_variant	Exon 3 of 3		XP_011532465.1	Q8NAT1A0A024R2P4
POMGNT2	XM_017007353.2 link	c.119G>A	p.Arg40Gln	missense_variant	Exon 4 of 4		XP_016862842.1	Q8NAT1A0A024R2P4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POMGNT2	ENST00000344697.3 link	c.119G>A	p.Arg40Gln	missense_variant	Exon 2 of 2	1	NM_032806.6	ENSP00000344125.2		Q8NAT1

Frequencies

GnomAD3 genomes

AF:

0.000342

AC:

AN:

152178

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00106

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.000169

AC:

AN:

248806

Hom.:

AF XY:

0.000156

AC XY:

AN XY:

134840

show subpopulations

Gnomad AFR exome

AF:

0.00118

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000980

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000266

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000102

AC:

149

AN:

1459756

Hom.:

Cov.:

AF XY:

0.0000936

AC XY:

AN XY:

726308

show subpopulations

Gnomad4 AFR exome

AF:

0.00131

Gnomad4 AMR exome

AF:

0.0000895

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00161

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000198

Gnomad4 OTH exome

AF:

0.000232

GnomAD4 genome

AF:

0.000341

AC:

AN:

152296

Hom.:

Cov.:

AF XY:

0.000349

AC XY:

AN XY:

74458

show subpopulations

Gnomad4 AFR

AF:

0.00106

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000386

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000947

Alfa

AF:

0.0000929

Hom.:

Bravo

AF:

0.000552

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00159

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000173

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Nov 02, 2021

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 22, 2019

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 8

Uncertain:1

Aug 10, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 40 of the POMGNT2 protein (p.Arg40Gln). This variant is present in population databases (rs146229269, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with POMGNT2-related conditions. ClinVar contains an entry for this variant (Variation ID: 473273). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not specified

Benign:1

Dec 09, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: POMGNT2 c.119G>A (p.Arg40Gln) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00012 in 1612052 control chromosomes, predominantly at a frequency of 0.0015 within the East Asian subpopulation in the gnomAD database, including 1 homozygotes. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 1.34 fold of the estimated maximal expected allele frequency for a pathogenic variant in POMGNT2 causing Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 8 phenotype (0.0011). To our knowledge, no occurrence of c.119G>A in individuals affected with Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 8 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 473273). Based on the evidence outlined above, the variant was classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.079

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.49

CADD

Benign

5.9

DANN

Benign

0.85

DEOGEN2

Benign

0.013

T;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.74

LIST_S2

Benign

0.67

.;T

M_CAP

Benign

0.017

MetaRNN

Benign

0.0094

T;T

MetaSVM

Benign

-0.90

MutationAssessor

Benign

0.97

L;L

PrimateAI

Benign

0.22

PROVEAN

Benign

-0.18

N;N

REVEL

Benign

0.22

Sift

Benign

0.34

T;T

Sift4G

Benign

0.16

T;T

Polyphen

0.0

B;B

Vest4

0.060

MVP

0.29

MPC

0.30

ClinPred

0.013

GERP RS

-1.1

Varity_R

0.013

gMVP

0.39

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