rs1057520764

Positions:

• chrX-32342264-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_004006.3(DMD):​c.5758C>T​(p.Gln1920Ter) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 23)
• Consequence: DMD NM_004006.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 5.97

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-32342264-G-A is Pathogenic according to our data. Variant chrX-32342264-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 379872.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-32342264-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DMD	NM_004006.3	c.5758C>T	p.Gln1920Ter	stop_gained	41/79	ENST00000357033.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DMD	ENST00000357033.9	c.5758C>T	p.Gln1920Ter	stop_gained	41/79	1	NM_004006.3	P4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jul 30, 2020	The DMD c.5758C>T; p.Gln1920Ter variant (rs1057520764) is reported in the literature in several individuals affected with Duchenne muscular dystrophy (Flanigan 2009, Okuba 2017). This variant is absent from general population databases (Exome Variant Server, Genome Aggregation Database), indicating it is not a common polymorphism. This variant induces an early termination codon and is predicted to result in a truncated protein or mRNA subject to nonsense-mediated decay. Based on available information, this variant is considered to be pathogenic. References: Flanigan KM et al. Mutational spectrum of DMD mutations in dystrophinopathy patients: application of modern diagnostic techniques to a large cohort. Hum Mutat. 2009;30(12):1657-1666. Okubo M et al. Comprehensive analysis for genetic diagnosis of Dystrophinopathies in Japan. Orphanet J Rare Dis. 2017;12(1):149. -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 18, 2017	The Q1920X pathogenic variant in the DMD gene has been reported previously in association withdystrophinopathy, specifically with Duchenne muscular dystrophy (Flanigan et al., 2009). It was notobserved in approximately 6,500 individuals of European and African American ancestry in theNHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations.The Q1920X variant is predicted to cause loss of normal protein function either through proteintrunctation or nonsense mediated mRNA decay. Therefore, we interpret the Q1920X variant as pathogenic. -

Cardiovascular phenotype Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 17, 2017

The p.Q1920* pathogenic mutation (also known as c.5758C>T), located in coding exon 41 of the DMD gene, results from a C to T substitution at nucleotide position 5758. This changes the amino acid from a glutamine to a stop codon within coding exon 41. This alteration has been detected in two affected males and a carrier female from a Duchenne Muscular Dystrophy cohort (Flanigan KM et al. Hum Mutat. 2009;30:1657-66). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Duchenne muscular dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 23, 2022

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 379872). This premature translational stop signal has been observed in individuals with Duchenne muscular dystrophy (PMID: 19937601, 31919629). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln1920*) in the DMD gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in DMD are known to be pathogenic (PMID: 16770791, 25007885). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	42
DANN	Uncertain	1.0
FATHMM_MKL	Uncertain	0.92	D
MutationTaster	Benign	1.0	A;A
Vest4		0.89
GERP RS		5.8

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1057520764; hg19: chrX-32360381;