X-31120136-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_004006.3(DMD):c.*1783A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0252 in 111,003 control chromosomes in the GnomAD database, including 68 homozygotes. There are 859 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.025 (68 hom., 859 hem., cov: 22)
  • Exomes 𝑓: 0.0033 (0 hom. 0 hem.)
• Consequence: DMD NM_004006.3 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.385

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 Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.59).
• BP6: Variant X-31120136-T-C is Benign according to our data. Variant chrX-31120136-T-C is described in ClinVar as [Benign]. Clinvar id is 368205.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-31120136-T-C is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.116 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DMD	NM_004006.3	c.*1783A>G		3_prime_UTR_variant	79/79	ENST00000357033.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DMD	ENST00000357033.9	c.*1783A>G		3_prime_UTR_variant	79/79	1	NM_004006.3	P4

Frequencies

GnomAD3 genomes AF: 0.0251 AC: 2782 AN: 110650 Hom.: 63 Cov.: 22 AF XY: 0.0255 AC XY: 853 AN XY: 33492

Gnomad AFR AF: 0.0609

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00669

Gnomad ASJ AF: 0.000384

Gnomad EAS AF: 0.115

Gnomad SAS AF: 0.128

Gnomad FIN AF: 0.00732

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000646

Gnomad OTH AF: 0.0154

GnomAD4 exome AF: 0.00333 AC: 1 AN: 300 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 128

Gnomad4 FIN exome AF: 0.00338

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0252 AC: 2793 AN: 110703 Hom.: 68 Cov.: 22 AF XY: 0.0256 AC XY: 859 AN XY: 33555

Gnomad4 AFR AF: 0.0608

Gnomad4 AMR AF: 0.00668

Gnomad4 ASJ AF: 0.000384

Gnomad4 EAS AF: 0.114

Gnomad4 SAS AF: 0.128

Gnomad4 FIN AF: 0.00732

Gnomad4 NFE AF: 0.000627

Gnomad4 OTH AF: 0.0251

Alfa AF: 0.0137 Hom.: 128

Bravo AF: 0.0268

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dilated cardiomyopathy 3B Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
Cadd	Benign	1.4
Dann	Benign	0.68

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: rs7886658; hg19: chrX-31138253;