18-34818323-C-T

Position:

chr18-34818323-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_001386795.1(DTNA):c.869C>T(p.Thr290Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000353 in 1,613,606 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000037 ( 0 hom. )

Consequence

DTNA
NM_001386795.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 6.13

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 Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.21380466).

BS2

High AC in GnomAdExome4 at 54 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DTNA	NM_001386795.1 linkuse as main transcript	c.869C>T	p.Thr290Met	missense_variant	8/23	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.869C>T	p.Thr290Met	missense_variant	8/23	5	NM_001386795.1	ENSP00000405819	P3	Q9Y4J8-17

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152124

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000478

AC:

AN:

250888

Hom.:

AF XY:

0.0000738

AC XY:

AN XY:

135586

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000545

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000369

AC:

AN:

1461482

Hom.:

Cov.:

AF XY:

0.0000330

AC XY:

AN XY:

727038

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000441

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152124

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74292

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000264

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Left ventricular noncompaction 1

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 28, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 22, 2022	This variant has not been reported in the literature in individuals affected with DTNA-related conditions. 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C15"). ClinVar contains an entry for this variant (Variation ID: 426774). This variant is present in population databases (rs747834756, gnomAD 0.06%), and has an allele count higher than expected for a pathogenic variant. This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 290 of the DTNA protein (p.Thr290Met). -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 16, 2024

The c.869C>T (p.T290M) alteration is located in exon 8 (coding exon 7) of the DTNA gene. This alteration results from a C to T substitution at nucleotide position 869, causing the threonine (T) at amino acid position 290 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 05, 2017

A variant of uncertain significance has been identified in the DTNA gene. Although the T290M variant has not been published as pathogenic or been reported as benign to our knowledge, it has been observed in 5/8264 (0.06%) alleles from individuals of East Asian ancestry in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The T290M variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. Additionally, this substitution occurs at a position where amino acids with similar properties to threonine (T) are tolerated across species, although methionine (M) is tolerated at this position in one non-mammalian species. Nevertheless, in silico analysis predicts this variant is probably damaging to the protein structure/function. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.47

BayesDel_addAF

Uncertain

0.086

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.49

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

Eigen

Uncertain

0.41

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.94

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

M_CAP

Benign

0.044

MetaRNN

Benign

0.21

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

MetaSVM

Uncertain

0.46

MutationAssessor

Benign

1.7

L;L;L;L;L;L;L;L;L;L;L;L;.

MutationTaster

Benign

1.0

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

PrimateAI

Pathogenic

0.88

PROVEAN

Uncertain

-2.7

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

REVEL

Uncertain

0.45

Sift

Benign

0.035

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

Sift4G

Uncertain

0.037

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

Polyphen

0.88

P;P;.;.;.;.;B;P;P;.;P;P;.

Vest4

0.53

MutPred

0.19

Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);Gain of MoRF binding (P = 0.0801);.;

MVP

0.83

MPC

0.51

ClinPred

0.37

GERP RS

6.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.20

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.13

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

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