X-32650983-G-A

Position:

• chrX-32650983-G-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PP5_Very_Strong

The NM_004006.3(DMD):​c.961-5831C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: DMD NM_004006.3 intron
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 0.00300

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 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-32650983-G-A is Pathogenic according to our data. Variant chrX-32650983-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 94849.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-32650983-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DMD	NM_004006.3	c.961-5831C>T		intron_variant		ENST00000357033.9	NP_003997.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DMD	ENST00000357033.9	c.961-5831C>T		intron_variant		1	NM_004006.3	ENSP00000354923.3

Frequencies

GnomAD3 genomes Cov.: 23

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

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	Eurofins Ntd Llc (ga)	Nov 15, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 12, 2019	This variant was shown to cause loss of normal protein function through nonsense-mediated mRNA decay, as no truncated protein was observed by Western blot (Beroud et al., 2004); This variant is associated with the following publications: (PMID: 19823873, 17041906, 14659407) -

Becker muscular dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Mendelics

May 04, 2022

- -

Duchenne muscular dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 09, 2021

This variant has been observed in individual(s) with DMD-related conditions (PMID: 14659407, 19823873, 17041906). This variant is also known as IVS9+46889C>T and IVS9+46806C>T. ClinVar contains an entry for this variant (Variation ID: 94849). For these reasons, this variant has been classified as Pathogenic. Studies have shown that this variant is associated with insertion of a cryptic exon, which introduces a premature termination codon (PMID: 17041906). The resulting mRNA is expected to undergo nonsense-mediated decay. This sequence change falls in intron 9 of the DMD gene. It does not directly change the encoded amino acid sequence of the DMD protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Uncertain	23
DANN	Benign	0.80

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.84		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.84		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs398124099; hg19: chrX-32669100;