chr18-34755980-A-G

Variant names:

• chr18-34755980-A-G
• rs984784834
• NM_001386795.1:c.4A>G

Variant summary

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

The NM_001386795.1(DTNA):​c.4A>G​(p.Ile2Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,818 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I2F) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DTNA NM_001386795.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.34
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• left ventricular noncompaction 1

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• Meniere disease

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• congenital heart disease

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• dilated cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

DTNA-AS1 (HGNC:58208):

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=0.3871091).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001386795.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DTNA	NM_001386795.1	MANE Select	c.4A>G	p.Ile2Val	missense	Exon 2 of 23	NP_001373724.1	A0A7P0TBH9
	DTNA	NM_001386788.1		c.4A>G	p.Ile2Val	missense	Exon 2 of 23	NP_001373717.1	Q9Y4J8-17
	DTNA	NM_001390.5		c.4A>G	p.Ile2Val	missense	Exon 1 of 22	NP_001381.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DTNA	ENST00000444659.6	TSL:5 MANE Select	c.4A>G	p.Ile2Val	missense	Exon 2 of 23	ENSP00000405819.2	Q9Y4J8-17
	DTNA	ENST00000598334.5	TSL:1	c.4A>G	p.Ile2Val	missense	Exon 3 of 20	ENSP00000470152.1	Q9Y4J8-15
	DTNA	ENST00000399121.9	TSL:1	c.4A>G	p.Ile2Val	missense	Exon 3 of 22	ENSP00000382072.5	Q9Y4J8-14

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460818 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726746

African (AFR) AF: 0.00 AC: 0 AN: 33442

American (AMR) AF: 0.00 AC: 0 AN: 44700

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39594

South Asian (SAS) AF: 0.00 AC: 0 AN: 86214

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53270

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111380

Other (OTH) AF: 0.00 AC: 0 AN: 60340

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Left ventricular noncompaction 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Benign	-0.0027	T
BayesDel_noAF	Benign	-0.24
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.012	T
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.39	T
MetaSVM	Benign	-0.95	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		8.3
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-0.43	N
REVEL	Benign	0.28
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.027	D
Polyphen		0.99	D
Vest4		0.57
MutPred		0.079		Gain of MoRF binding (P = 0.1374)
MVP		0.46
MPC		0.41
ClinPred		0.86	D
GERP RS		5.8
PromoterAI		0.0066	Neutral
Varity_R		0.18
gMVP		0.58
Mutation Taster		=212/88	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs984784834; hg19: chr18-32335944;