chrX-32697942-G-C

Variant names:

• chrX-32697942-G-C
• rs977310228
• NM_004006.3:c.888C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_004006.3(DMD):​c.888C>G​(p.Phe296Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000914 in 1,094,353 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. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. F296F) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: DMD NM_004006.3 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 4.98
• 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: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet
• 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: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.40060833).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DMD	NM_004006.3	c.888C>G	p.Phe296Leu	missense_variant	Exon 9 of 79	ENST00000357033.9	NP_003997.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DMD	ENST00000357033.9	c.888C>G	p.Phe296Leu	missense_variant	Exon 9 of 79	1	NM_004006.3	ENSP00000354923.3

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.14e-7 AC: 1 AN: 1094353 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 360167

African (AFR) AF: 0.00 AC: 0 AN: 26329

American (AMR) AF: 0.00 AC: 0 AN: 34837

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19312

East Asian (EAS) AF: 0.00 AC: 0 AN: 30084

South Asian (SAS) AF: 0.00 AC: 0 AN: 53419

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40328

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4130

European-Non Finnish (NFE) AF: 0.00000119 AC: 1 AN: 839939

Other (OTH) AF: 0.00 AC: 0 AN: 45975

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

Becker muscular dystrophy, Cardiomyopathy, Duchenne muscular dystrophy, Dystrophin deficiency Uncertain:1

Feb 18, 2025

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.25	.;T;.;.;T
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.87	D;.;D;D;D
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.40	T;T;T;T;T
MetaSVM	Benign	-0.65	T
PhyloP100		5.0
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-0.83	.;N;.;N;N
REVEL	Benign	0.041
Sift	Benign	0.12	.;T;.;T;T
Sift4G	Benign	0.32	T;T;T;T;T
Polyphen		0.0010, 0.28	.;B;.;.;B
Vest4		0.57
MutPred		0.34		.;.;Loss of methylation at K297 (P = 0.0301);Loss of methylation at K297 (P = 0.0301);.;
MVP		0.77
MPC		0.065
ClinPred		0.72	D
GERP RS		4.8
gMVP		0.33
Mutation Taster		=62/38	polymorphism

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: rs977310228; hg19: chrX-32716059;