18-34875261-G-A

Position:

chr18-34875261-G-A

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_001386795.1(DTNA):c.1766G>A(p.Arg589His) variant causes a missense change. The variant allele was found at a frequency of 0.000176 in 1,613,906 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

DTNA
NM_001386795.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 4.12

Variant links:

Genes affected

DTNA (HGNC:3057): (dystrobrevin alpha) The protein encoded by this gene belongs to the dystrobrevin subfamily of the dystrophin family. This protein is a component of the dystrophin-associated protein complex (DPC), which consists of dystrophin and several integral and peripheral membrane proteins, including dystroglycans, sarcoglycans, syntrophins and alpha- and beta-dystrobrevin. The DPC localizes to the sarcolemma and its disruption is associated with various forms of muscular dystrophy. Mutations in this gene are associated with left ventricular noncompaction with congenital heart defects. Multiple alternatively spliced transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

DTNA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.05970013).

BS2

High AC in GnomAd4 at 17 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DTNA	NM_001386795.1 linkuse as main transcript	c.1766G>A	p.Arg589His	missense_variant	18/23	ENST00000444659.6	NP_001373724.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DTNA	ENST00000444659.6 linkuse as main transcript	c.1766G>A	p.Arg589His	missense_variant	18/23	5	NM_001386795.1	ENSP00000405819	P3	Q9Y4J8-17

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152086

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000197

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000415

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000179

AC:

AN:

250934

Hom.:

AF XY:

0.000206

AC XY:

AN XY:

135704

show subpopulations

Gnomad AFR exome

AF:

0.0000618

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000163

Gnomad SAS exome

AF:

0.000686

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000123

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000183

AC:

267

AN:

1461702

Hom.:

Cov.:

AF XY:

0.000206

AC XY:

150

AN XY:

727130

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000201

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000202

Gnomad4 SAS exome

AF:

0.000777

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000159

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.000112

AC:

AN:

152204

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74434

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000415

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000662

Hom.:

Bravo

AF:

0.0000642

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000157

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 08, 2023	Variant summary: DTNA c.1685G>A (p.Arg562His) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00018 in 250934 control chromosomes, predominantly at a frequency of 0.00069 within the South Asian subpopulation in the gnomAD database. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 27.6 fold of the estimated maximal expected allele frequency for a pathogenic variant in DTNA causing Cardiomyopathy phenotype (2.5e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. To our knowledge, no occurrence of c.1685G>A in individuals affected with Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. One laboratory classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as likely benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Dec 12, 2013	Variant classified as Uncertain Significance - Favor Benign. The Arg505His varia nt in DTNA has not been previously reported in individuals with cardiomyopathy, but has been identified in 1/8600 European American chromosomes by the NHLBI Exo me Sequencing Project and in 0.2% (3/1324) of chromosomes tested by the ClinSeq project. (http://evs.gs.washington.edu/EVS/; dbSNP rs200246467). Arginine (Arg) at position 505 is not conserved in evolutionarily distant species and the frog and 4 fish species carry a histidine (His) at this position, raising the possibi lity that this change may be tolerated. Additional computational analyses (bioch emical amino acid properties, AlignGVGD, PolyPhen2, and SIFT) do not provide str ong support for or against an impact to the protein. While this frequency and la ck of conservation suggests that this variant is more likely benign, it is too l ow to confidently rule out a disease causing role. Additional information is nee ded to fully assess its clinical significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Jun 24, 2013

- -

Left ventricular noncompaction 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 21, 2023

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 562 of the DTNA protein (p.Arg562His). This variant is present in population databases (rs200246467, gnomAD 0.06%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with DTNA-related conditions. ClinVar contains an entry for this variant (Variation ID: 179015). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.43

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.17

.;.;.;.;.;T;T;T;.;.;.

Eigen

Uncertain

0.21

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.96

D;D;D;D;.;D;.;D;D;D;D

M_CAP

Benign

0.0087

MetaRNN

Benign

0.060

T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.42

.;.;.;.;.;N;N;.;.;.;.

MutationTaster

Benign

1.0

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

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-0.80

N;.;.;.;.;N;N;.;N;.;N

REVEL

Benign

0.059

Sift

Benign

0.30

T;.;.;.;.;T;T;.;T;.;T

Sift4G

Benign

0.29

T;T;T;T;T;T;T;T;T;T;T

Polyphen

0.017

B;.;.;.;B;D;D;.;.;D;.

Vest4

0.27

MVP

0.58

MPC

0.39

ClinPred

0.053

GERP RS

5.5

Varity_R

0.15

gMVP

0.26

Splicing

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