rs149838438

Positions:

chr3-49531817-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_004393.6(DAG1):c.1306A>G(p.Thr436Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000132 in 1,613,522 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T436T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000086 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

DAG1
NM_004393.6 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 5.29

Variant links:

Genes affected

DAG1 (HGNC:2666): (dystroglycan 1) This gene encodes dystroglycan, a central component of dystrophin-glycoprotein complex that links the extracellular matrix and the cytoskeleton in the skeletal muscle. The encoded preproprotein undergoes O- and N-glycosylation, and proteolytic processing to generate alpha and beta subunits. Certain mutations in this gene are known to cause distinct forms of muscular dystrophy. Alternative splicing results in multiple transcript variants, all encoding the same protein. [provided by RefSeq, Nov 2015]

DAG1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.1115343).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DAG1	NM_004393.6 linkuse as main transcript	c.1306A>G	p.Thr436Ala	missense_variant	3/3	ENST00000308775.7	NP_004384.5	Q14118A0A024R2W4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DAG1	ENST00000308775.7 linkuse as main transcript	c.1306A>G	p.Thr436Ala	missense_variant	3/3	1	NM_004393.6	ENSP00000312435.2		Q14118

Frequencies

GnomAD3 genomes

AF:

0.0000858

AC:

AN:

151514

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000243

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:

0.000177

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000557

AC:

AN:

251462

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000123

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000137

AC:

200

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000132

AC XY:

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000157

Gnomad4 OTH exome

AF:

0.000414

GnomAD4 genome

AF:

0.0000857

AC:

AN:

151632

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74102

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000177

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000247

Hom.:

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 18, 2018	A variant of uncertain significance has been identified in the DAG1 gene. The T436A variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The T436A variant is observed in 15/126670 (0.01%) alleles from individuals of European background (Lek et al., 2016). The T436A 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. However, in-silico analyses, including protein predictors and evolutionary conservation, support that this variant does not alter protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 31, 2018	- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 24, 2023

The c.1306A>G (p.T436A) alteration is located in exon 3 (coding exon 2) of the DAG1 gene. This alteration results from a A to G substitution at nucleotide position 1306, causing the threonine (T) at amino acid position 436 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A9;C4511963:Autosomal recessive limb-girdle muscular dystrophy type 2P

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2023

This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 436 of the DAG1 protein (p.Thr436Ala). This variant is present in population databases (rs149838438, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with DAG1-related conditions. ClinVar contains an entry for this variant (Variation ID: 284765). 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 tolerated. 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

0.082

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.46

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.35

T;T;T;T;T;T

Eigen

Benign

0.0098

Eigen_PC

Benign

0.21

FATHMM_MKL

Uncertain

0.85

LIST_S2

Benign

0.83

T;.;.;.;.;.

M_CAP

Benign

0.0076

MetaRNN

Benign

0.11

T;T;T;T;T;T

MetaSVM

Benign

-0.94

MutationAssessor

Benign

1.4

L;L;L;L;L;L

PrimateAI

Benign

0.47

PROVEAN

Benign

-0.84

N;N;N;N;N;N

REVEL

Benign

0.051

Sift

Benign

0.11

T;T;T;T;T;T

Sift4G

Benign

0.20

T;T;T;T;T;T

Polyphen

0.18

B;B;B;B;B;B

Vest4

0.17

MVP

0.50

MPC

0.28

ClinPred

0.088

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.061

gMVP

0.44

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

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