chr14-77278484-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_013382.7(POMT2):c.2057G>A(p.Arg686Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000212 in 1,493,290 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R686W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00022 ( 2 hom. )

Consequence

POMT2
NM_013382.7 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 1.16

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A2
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
myopathy caused by variation in POMT2
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B2
Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
autosomal recessive limb-girdle muscular dystrophy type 2N
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy with cerebellar involvement
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy with intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscle-eye-brain disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscular dystrophy-dystroglycanopathy, type A
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

POMT2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.008947343).

BP6

Variant 14-77278484-C-T is Benign according to our data. Variant chr14-77278484-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 282243.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000131 (20/152332) while in subpopulation SAS AF = 0.00248 (12/4832). AF 95% confidence interval is 0.00143. There are 0 homozygotes in GnomAd4. There are 13 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_013382.7. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POMT2	NM_013382.7	MANE Select	c.2057G>A	p.Arg686Gln	missense	Exon 20 of 21	NP_037514.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
POMT2	ENST00000261534.9	TSL:1 MANE Select	c.2057G>A	p.Arg686Gln	missense	Exon 20 of 21	ENSP00000261534.4
POMT2	ENST00000682795.1		c.2204G>A	p.Arg735Gln	missense	Exon 21 of 22	ENSP00000507574.1
POMT2	ENST00000682467.1		c.1916G>A	p.Arg639Gln	missense	Exon 19 of 20	ENSP00000508062.1

Frequencies

GnomAD3 genomes

AF:

0.000131

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00248

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000486

AC:

AN:

156468

AF XY:

0.000774

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000400

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000482

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000221

AC:

297

AN:

1340958

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

214

AN XY:

664268

show subpopulations

African (AFR)

AF:

0.0000330

AC:

AN:

30318

American (AMR)

AF:

0.0000278

AC:

AN:

35990

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24878

East Asian (EAS)

AF:

0.00

AC:

AN:

35644

South Asian (SAS)

AF:

0.00272

AC:

213

AN:

78210

European-Finnish (FIN)

AF:

0.00

AC:

AN:

46434

Middle Eastern (MID)

AF:

0.000537

AC:

AN:

5582

European-Non Finnish (NFE)

AF:

0.0000623

AC:

AN:

1027666

Other (OTH)

AF:

0.000267

AC:

AN:

56236

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.474

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000131

AC:

AN:

152332

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74494

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41570

American (AMR)

AF:

0.0000653

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00248

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68018

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.530

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000957

Hom.:

Bravo

AF:

0.0000491

ExAC

AF:

0.000324

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

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 (1)

not specified (1)

POMT2-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

-0.38

BayesDel_noAF

Benign

-0.32

CADD

Benign

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.30

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.10

FATHMM_MKL

Benign

0.66

LIST_S2

Benign

0.83

M_CAP

Benign

0.036

MetaRNN

Benign

0.0089

MetaSVM

Benign

-0.82

MutationAssessor

Benign

1.3

PhyloP100

1.2

PrimateAI

Benign

0.34

PROVEAN

Benign

0.48

REVEL

Benign

0.16

Sift

Benign

0.37

Sift4G

Benign

0.55

Polyphen

0.024

Vest4

0.14

MVP

0.69

MPC

0.095

ClinPred

0.043

GERP RS

4.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.066

gMVP

0.38

Mutation Taster

=84/16

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over