chrX-31177931-C-T

Position:

chrX-31177931-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PVS1_ModerateBP6BS1BS2

The NM_004006.3(DMD):c.10262+1G>A variant causes a splice donor change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000139 in 1,204,431 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 53 hemizygotes in GnomAD. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00062 ( 0 hom., 23 hem., cov: 23)

Exomes 𝑓: 0.000091 ( 0 hom. 30 hem. )

Consequence

DMD
NM_004006.3 splice_donor

Scores

Splicing: ADA: 1.000

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:6

Conservation

PhyloP100: 7.31

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.0034364262 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.

BP6

Variant X-31177931-C-T is Benign according to our data. Variant chrX-31177931-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 94433.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=4, Uncertain_significance=3}. Variant chrX-31177931-C-T is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000619 (69/111532) while in subpopulation AFR AF= 0.00195 (60/30774). AF 95% confidence interval is 0.00155. There are 0 homozygotes in gnomad4. There are 23 alleles in male gnomad4 subpopulation. Median coverage is 23. This position pass quality control queck.

BS2

High Hemizygotes in GnomAd4 at 23 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DMD	NM_004006.3 linkuse as main transcript	c.10262+1G>A		splice_donor_variant		ENST00000357033.9	NP_003997.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DMD	ENST00000357033.9 linkuse as main transcript	c.10262+1G>A		splice_donor_variant		1	NM_004006.3	ENSP00000354923	P4

Frequencies

GnomAD3 genomes

AF:

0.000628

AC:

AN:

111481

Hom.:

Cov.:

AF XY:

0.000682

AC XY:

AN XY:

33733

show subpopulations

Gnomad AFR

AF:

0.00199

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000477

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000566

Gnomad OTH

AF:

0.000669

GnomAD3 exomes

AF:

0.000240

AC:

AN:

179061

Hom.:

AF XY:

0.000140

AC XY:

AN XY:

64291

show subpopulations

Gnomad AFR exome

AF:

0.00172

Gnomad AMR exome

AF:

0.000479

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000728

Gnomad SAS exome

AF:

0.000111

Gnomad FIN exome

AF:

0.0000632

Gnomad NFE exome

AF:

0.0000501

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000906

AC:

AN:

1092899

Hom.:

Cov.:

AF XY:

0.0000836

AC XY:

AN XY:

358863

show subpopulations

Gnomad4 AFR exome

AF:

0.00179

Gnomad4 AMR exome

AF:

0.000314

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000561

Gnomad4 FIN exome

AF:

0.0000248

Gnomad4 NFE exome

AF:

0.0000262

Gnomad4 OTH exome

AF:

0.000305

GnomAD4 genome

AF:

0.000619

AC:

AN:

111532

Hom.:

Cov.:

AF XY:

0.000681

AC XY:

AN XY:

33794

show subpopulations

Gnomad4 AFR

AF:

0.00195

Gnomad4 AMR

AF:

0.000476

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000566

Gnomad4 OTH

AF:

0.000661

Alfa

AF:

0.0000620

Hom.:

Bravo

AF:

0.000975

ESP6500AA

AF:

0.00157

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000214

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 15, 2018	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 05, 2021	This variant is associated with the following publications: (PMID: 30415094, 23871722, 23352160, 26743743, 26990548, 32013268, 30275481) -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jun 27, 2019	- -

Dilated cardiomyopathy 3B

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Centre for Mendelian Genomics, University Medical Centre Ljubljana	Jan 01, 2016	This variant was classified as: Uncertain significance. The following ACMG criteria were applied in classifying this variant: PP3. This variant was detected in hemizygous state. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Nov 16, 2018	The DMD c.10262+1G>A variant occurs in a canonical splice site (donor) and is therefore predicted to disrupt or distort the normal gene product. The variant is reported in one study and found in one deceased individual affected with sudden unexpected death (Schieper et al. 2018). Control data are unavailable for this variant, which is reported at a frequency of 0.001630 in the African population of the Genome Aggregation Database and includes nine hemizygotes in this population and 15 hemizygotes in the Total population. Based on the potential impact of splice donor variants and the limited evidence, this variant is classified as a variant of unknown significance but suspicious for pathogenicity for X-linked dilated cardiomyopathy. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Duchenne muscular dystrophy

Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 26, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -

not specified

Benign:1

Benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 09, 2022

Variant summary: DMD c.10262+1G>A is located in a canonical splice-site and is predicted to affect mRNA splicing resulting in a significantly altered protein due to either exon skipping, shortening, or inclusion of intronic material. Several computational tools predict a significant impact on normal splicing: Three predict the variant abolishes a 5 splicing donor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00024 in 179061 control chromosomes (including 9 hemizygotes), predominantly at a frequency of 0.0017 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 154-fold of the estimated maximal expected allele frequency for a pathogenic variant in DMD causing Dystrophinopathies phenotype (1.1e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.10262+1G>A has been reported in the literature in male individuals affected with dystrophinopathies, autism spectrum disorder and atrial fibrillation and also, in women with sudden death and peripartum cardiomyopathy (Lim_2013, Kim_2016, Ware_2016, Scheiper_2018, Vad_2020). These reports do not provide unequivocal conclusions about association of the variant with Dystrophinopathies. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five ClinVar submitters (evaluation after 2014) cite the variant as benign/likely benign and three ClinVar submitters (evaluation after 2014) cite it as uncertain significance. Based on the evidence outlined above, the variant was classified as benign. -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 09, 2019

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Pathogenic

0.39

CADD

Pathogenic

DANN

Uncertain

1.0

FATHMM_MKL

Pathogenic

0.99

MutationTaster

Benign

1.0

D;D;D;D;D;D;D;D;D;D;D

GERP RS

4.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.94

SpliceAI score (max)

0.94

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.94

Position offset: 1

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over