NM_004006.3:c.657T>C

Variant names:

• chrX-32699286-A-G
• rs771312947
• NM_004006.3:c.657T>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_004006.3(DMD):​c.657T>C​(p.Asp219Asp) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000918 in 1,089,771 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.2e-7 (0 hom. 0 hem.)
• Consequence: DMD NM_004006.3 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter U:1 B:1
• Conservation: PhyloP100: -0.0900
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Becker muscular dystrophy

  Inheritance: XL Classification: DEFINITIVE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
• dilated cardiomyopathy 3B

  Inheritance: XL Classification: DEFINITIVE Submitted by: Ambry Genetics
• Duchenne and Becker muscular dystrophy

  Inheritance: XL Classification: DEFINITIVE Submitted by: Myriad Women’s Health
• Duchenne muscular dystrophy

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• progressive muscular dystrophy

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• non-syndromic X-linked intellectual disability

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• symptomatic form of muscular dystrophy of Duchenne and Becker in female carriers

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).
• BP6: Variant X-32699286-A-G is Benign according to our data. Variant chrX-32699286-A-G is described in ClinVar as Likely_benign. ClinVar VariationId is 1984915.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.09 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004006.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DMD	NM_004006.3	MANE Select	c.657T>C	p.Asp219Asp	synonymous	Exon 8 of 79	NP_003997.2	P11532-1
	DMD	NM_004009.3		c.645T>C	p.Asp215Asp	synonymous	Exon 8 of 79	NP_004000.1	P11532
	DMD	NM_000109.4		c.633T>C	p.Asp211Asp	synonymous	Exon 8 of 79	NP_000100.3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DMD	ENST00000357033.9	TSL:1 MANE Select	c.657T>C	p.Asp219Asp	synonymous	Exon 8 of 79	ENSP00000354923.3	P11532-1
	DMD	ENST00000288447.9	TSL:1	c.633T>C	p.Asp211Asp	synonymous	Exon 8 of 18	ENSP00000288447.4	Q4G0X0
	DMD	ENST00000447523.1	TSL:1	c.246+124009T>C		intron	N/A	ENSP00000395904.1	Q14174

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.18e-7 AC: 1 AN: 1089771 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 355673

African (AFR) AF: 0.00 AC: 0 AN: 26195

American (AMR) AF: 0.00 AC: 0 AN: 35173

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19307

East Asian (EAS) AF: 0.00 AC: 0 AN: 30136

South Asian (SAS) AF: 0.00 AC: 0 AN: 53930

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40489

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4114

European-Non Finnish (NFE) AF: 0.00000120 AC: 1 AN: 834610

Other (OTH) AF: 0.00 AC: 0 AN: 45817

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Becker muscular dystrophy, Cardiomyopathy, Duchenne muscular dystrophy, Dystrophin deficiency (1)
-	-	1	Duchenne muscular dystrophy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
CADD	Benign	6.1
DANN	Benign	0.54
PhyloP100		-0.090

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

Other links and lift over

dbSNP: rs771312947; hg19: chrX-32717403;