chr14-77320453-C-T

Position:

chr14-77320453-C-T

Variant summary

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

The NM_013382.7(POMT2):c.229G>A(p.Asp77Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000105 in 1,546,402 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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 0.00045 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000067 ( 0 hom. )

Consequence

POMT2
NM_013382.7 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:1

Conservation

PhyloP100: 0.663

Variant links:

Genes affected

POMT2 (HGNC:19743): (protein O-mannosyltransferase 2) The protein encoded by this gene is an O-mannosyltransferase that requires interaction with the product of the POMT1 gene for enzymatic function. The encoded protein is found in the membrane of the endoplasmic reticulum. Defects in this gene are a cause of Walker-Warburg syndrome (WWS).[provided by RefSeq, Oct 2008]

POMT2 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=0.024628252).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000453 (69/152332) while in subpopulation AFR AF= 0.00156 (65/41576). AF 95% confidence interval is 0.00126. There are 0 homozygotes in gnomad4. There are 37 alleles in male gnomad4 subpopulation. Median coverage is 32. 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/exons	MANE	Protein	UniProt
POMT2	NM_013382.7 linkuse as main transcript	c.229G>A	p.Asp77Asn	missense_variant	1/21	ENST00000261534.9	NP_037514.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POMT2	ENST00000261534.9 linkuse as main transcript	c.229G>A	p.Asp77Asn	missense_variant	1/21	1	NM_013382.7	ENSP00000261534	P1	Q9UKY4-1

Frequencies

GnomAD3 genomes

AF:

0.000453

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00157

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.000130

AC:

AN:

146360

Hom.:

AF XY:

0.000102

AC XY:

AN XY:

78346

show subpopulations

Gnomad AFR exome

AF:

0.000973

Gnomad AMR exome

AF:

0.000404

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:

0.0000181

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000667

AC:

AN:

1394070

Hom.:

Cov.:

AF XY:

0.0000552

AC XY:

AN XY:

687916

show subpopulations

Gnomad4 AFR exome

AF:

0.00180

Gnomad4 AMR exome

AF:

0.000504

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:

0.00000649

Gnomad4 OTH exome

AF:

0.000173

GnomAD4 genome

AF:

0.000453

AC:

AN:

152332

Hom.:

Cov.:

AF XY:

0.000497

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.00156

Gnomad4 AMR

AF:

0.000131

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

Alfa

AF:

0.000130

Hom.:

Bravo

AF:

0.000680

ESP6500AA

AF:

0.00145

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000642

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 29, 2021	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; This variant is associated with the following publications: (PMID: 30564623) -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 20, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	May 02, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Nov 03, 2017	- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 02, 2024

The c.229G>A (p.D77N) alteration is located in exon 1 (coding exon 1) of the POMT2 gene. This alteration results from a G to A substitution at nucleotide position 229, causing the aspartic acid (D) at amino acid position 77 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A2;C3150416:Muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B2;C3150418:Autosomal recessive limb-girdle muscular dystrophy type 2N;C4284790:Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 17, 2022

- -

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 08, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.41

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.18

Eigen

Benign

-0.42

Eigen_PC

Benign

-0.28

FATHMM_MKL

Benign

0.43

LIST_S2

Uncertain

0.90

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.025

MetaSVM

Benign

-0.89

MutationAssessor

Benign

1.0

MutationTaster

Benign

1.0

PrimateAI

Benign

0.37

PROVEAN

Benign

0.020

REVEL

Benign

0.25

Sift

Benign

0.49

Sift4G

Benign

0.48

Polyphen

0.0040

Vest4

0.35

MVP

0.85

MPC

0.082

ClinPred

0.023

GERP RS

4.3

Varity_R

0.079

gMVP

0.51

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