rs1060502616

Positions:

• chrX-32484997-C-T

Variant summary

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

The NM_004006.3(DMD):​c.2725G>A​(p.Ala909Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000456 in 1,097,557 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. 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. A909V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000046 (0 hom. 0 hem.)
• Consequence: DMD NM_004006.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 5.75

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]

ACMG classification

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/exons	MANE	UniProt
DMD	NM_004006.3	c.2725G>A	p.Ala909Thr	missense_variant	21/79	ENST00000357033.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DMD	ENST00000357033.9	c.2725G>A	p.Ala909Thr	missense_variant	21/79	1	NM_004006.3	P4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000456 AC: 5 AN: 1097557 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 362953

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: 0.00000475

Gnomad4 OTH exome AF: 0.0000217

GnomAD4 genome Cov.: 23

Bravo AF: 0.00000378

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Duchenne muscular dystrophy;C0878544:Cardiomyopathy;C0917713:Becker muscular dystrophy;na:Dystrophin deficiency Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Jun 30, 2020

- -

Duchenne muscular dystrophy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 25, 2023

This variant has not been reported in the literature in individuals affected with DMD-related conditions. 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. 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. ClinVar contains an entry for this variant (Variation ID: 409883). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 909 of the DMD protein (p.Ala909Thr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.25	.;T;.;.
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	D;.;D;D
M_CAP	Uncertain	0.096	D
MetaRNN	Uncertain	0.56	D;D;D;D
MetaSVM	Benign	-0.90	T
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-1.1	.;N;.;N
REVEL	Benign	0.12
Sift	Benign	0.093	.;T;.;T
Sift4G	Benign	0.30	T;T;T;T
Polyphen		1.0	.;D;.;.
Vest4		0.61
MutPred		0.35		.;.;Loss of catalytic residue at A909 (P = 0.1314);Loss of catalytic residue at A909 (P = 0.1314);
MVP		0.69
MPC		0.11
ClinPred		0.86	D
GERP RS		5.1
gMVP		0.12

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

Other links and lift over

dbSNP: rs1060502616; hg19: chrX-32503114;