X-32697907-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_StrongBP6BS2_Supporting

The NM_004006.3(DMD):c.923C>A(p.Thr308Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000141 in 1,207,836 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 4 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 15/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T308I) has been classified as Benign.

Frequency

Genomes: 𝑓 0.000081 ( 0 hom., 1 hem., cov: 22)

Exomes 𝑓: 0.0000073 ( 0 hom. 3 hem. )

Consequence

DMD
NM_004006.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 2.82

Publications

2 publications found

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 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

DMD links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.054557025).

BP6

Variant X-32697907-G-T is Benign according to our data. Variant chrX-32697907-G-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 497518.

BS2

High AC in GnomAd4 at 9 XL,AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DMD	NM_004006.3 link	c.923C>A	p.Thr308Asn	missense_variant	Exon 9 of 79	ENST00000357033.9	NP_003997.2	P11532

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DMD	ENST00000357033.9 link	c.923C>A	p.Thr308Asn	missense_variant	Exon 9 of 79	1	NM_004006.3	ENSP00000354923.3		A0A075B6G3

Frequencies

GnomAD3 genomes

AF:

0.0000723

AC:

AN:

110613

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000230

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000189

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000276

AC:

AN:

181050

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000307

Gnomad AMR exome

AF:

0.0000367

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000729

AC:

AN:

1097167

Hom.:

Cov.:

AF XY:

0.00000827

AC XY:

AN XY:

362755

show subpopulations

African (AFR)

AF:

0.0000379

AC:

AN:

26370

American (AMR)

AF:

0.0000285

AC:

AN:

35102

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19353

East Asian (EAS)

AF:

0.00

AC:

AN:

30163

South Asian (SAS)

AF:

0.00

AC:

AN:

53957

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40481

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4134

European-Non Finnish (NFE)

AF:

0.00000713

AC:

AN:

841552

Other (OTH)

AF:

0.00

AC:

AN:

46055

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000813

AC:

AN:

110669

Hom.:

Cov.:

AF XY:

0.0000304

AC XY:

AN XY:

32937

show subpopulations

African (AFR)

AF:

0.000263

AC:

AN:

30442

American (AMR)

AF:

0.00

AC:

AN:

10318

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2624

East Asian (EAS)

AF:

0.00

AC:

AN:

3477

South Asian (SAS)

AF:

0.00

AC:

AN:

2604

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5948

Middle Eastern (MID)

AF:

0.00

AC:

AN:

216

European-Non Finnish (NFE)

AF:

0.0000189

AC:

AN:

52848

Other (OTH)

AF:

0.00

AC:

AN:

1510

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000529

ESP6500AA

AF:

0.000522

AC:

ESP6500EA

AF:

0.000149

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Oct 04, 2016

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 27, 2019

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Duchenne muscular dystrophy;C0878544:Cardiomyopathy;C0917713:Becker muscular dystrophy;na:Dystrophin deficiency

Uncertain:1

Apr 25, 2020

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Duchenne muscular dystrophy

Uncertain:1

Nov 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces threonine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 308 of the DMD protein (p.Thr308Asn). This variant is present in population databases (rs145064612, gnomAD 0.02%). This missense change has been observed in individual(s) with DMD-related conditions (internal data). ClinVar contains an entry for this variant (Variation ID: 497518). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt DMD protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Benign:1

Jan 29, 2024

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

AlphaMissense

Benign

0.089

BayesDel_addAF

Benign

-0.52

BayesDel_noAF

Benign

-0.68

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.23

.;T;.;.;T

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.78

T;.;T;T;T

M_CAP

Benign

0.017

MetaRNN

Benign

0.055

T;T;T;T;T

MetaSVM

Benign

-0.77

PhyloP100

2.8

PrimateAI

Benign

0.32

PROVEAN

Benign

-0.090

.;N;.;N;N

REVEL

Benign

0.14

Sift

Benign

0.52

.;T;.;T;T

Sift4G

Benign

0.32

T;T;T;T;T

Polyphen

0.0050, 0.013

.;B;.;.;B

Vest4

0.33

MVP

0.63

MPC

0.017

ClinPred

0.044

GERP RS

5.1

gMVP

0.35

Mutation Taster

=97/3

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over