Genetic Variant NM_004006.3:c.1310C>T (chrX-32644153-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004006.3(DMD):c.1310C>T(p.Ala437Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000365 in 1,094,968 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 22)

Exomes 𝑓: 0.0000037 ( 0 hom. 1 hem. )

Consequence

DMD
NM_004006.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.81

Variant links:

Genes affected

DMD (HGNC:2928): (dystrophin) This gene spans a genomic range of greater than 2 Mb and encodes a large protein containing an N-terminal actin-binding domain and multiple spectrin repeats. The encoded protein forms a component of the dystrophin-glycoprotein complex (DGC), which bridges the inner cytoskeleton and the extracellular matrix. Deletions, duplications, and point mutations at this gene locus may cause Duchenne muscular dystrophy (DMD), Becker muscular dystrophy (BMD), or cardiomyopathy. Alternative promoter usage and alternative splicing result in numerous distinct transcript variants and protein isoforms for this gene. [provided by RefSeq, Dec 2016]

DMD links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DMD	NM_004006.3 link	c.1310C>T	p.Ala437Val	missense_variant	Exon 11 of 79	ENST00000357033.9	NP_003997.2	P11532

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DMD	ENST00000357033.9 link	c.1310C>T	p.Ala437Val	missense_variant	Exon 11 of 79	1	NM_004006.3	ENSP00000354923.3		A0A075B6G3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000365

AC:

AN:

1094968

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

360584

show subpopulations

Gnomad4 AFR exome

AF:

0.00

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:

0.00000476

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Duchenne muscular dystrophy

Uncertain:1

May 23, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 437 of the DMD protein (p.Ala437Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DMD-related conditions. ClinVar contains an entry for this variant (Variation ID: 1427855). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt DMD protein function. This variant disrupts the p.Ala437 amino acid residue in DMD. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 16770791, 19937601, 32559196; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.093

BayesDel_noAF

Benign

-0.37

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.30

.;T;.;.;T

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.94

D;.;D;D;D

M_CAP

Benign

0.033

MetaRNN

Uncertain

0.52

D;D;D;D;D

MetaSVM

Benign

-0.80

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-1.7

.;N;.;N;N

REVEL

Benign

0.16

Sift

Benign

0.14

.;T;.;T;T

Sift4G

Benign

0.063

T;T;T;T;D

Polyphen

0.81, 0.95

.;P;.;.;P

Vest4

0.62

MutPred

0.46

.;.;Loss of ubiquitination at K441 (P = 0.0877);Loss of ubiquitination at K441 (P = 0.0877);.;

MVP

0.62

MPC

0.10

ClinPred

0.92

GERP RS

5.8

gMVP

0.33

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over