chr18-34755993-G-C

Position:

• chr18-34755993-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001386795.1(DTNA):​c.17G>C​(p.Gly6Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000248 in 1,613,134 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G6R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: DTNA NM_001386795.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.95

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DTNA	NM_001386795.1	c.17G>C	p.Gly6Ala	missense_variant	2/23	ENST00000444659.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DTNA	ENST00000444659.6	c.17G>C	p.Gly6Ala	missense_variant	2/23	5	NM_001386795.1	P3
	ENST00000596954.1	n.314-358C>G		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152114 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

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: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461020 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 726856

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152114 Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1 AN XY: 74306

Gnomad4 AFR AF: 0.00

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: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 22, 2014

The Gly6Ala variant in DTNA has not been previously reported in any other famili es with cardiomyopathy or in large population studies. Computational prediction tools and conservation analysis do not provide strong support for or against an impact to the protein. Additional information is needed to fully assess the clin ical significance of the Gly6Ala variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	26
DANN	Uncertain	1.0
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D;D;.;D;D;D;D;.;D;D;D;.
M_CAP	Benign	0.017	T
MetaRNN	Uncertain	0.49	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.3	M;M;M;.;.;.;M;.;M;M;M;M;M;M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-2.2	N;.;N;.;.;.;.;.;D;N;.;.;.;N;.;N;N
REVEL	Benign	0.23
Sift	Benign	0.054	T;.;T;.;.;.;.;.;T;T;.;.;.;T;.;T;T
Sift4G	Benign	0.089	T;T;T;D;D;D;T;.;T;T;T;T;T;T;T;T;T
Polyphen		0.99	D;.;P;.;.;.;.;.;.;.;.;D;D;D;.;D;D
Vest4		0.82
MutPred		0.29		Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);Loss of glycosylation at S5 (P = 0.0524);
MVP		0.54
MPC		0.56
ClinPred		0.91	D
GERP RS		5.8
Varity_R		0.31
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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

Other links and lift over

dbSNP: rs397517446; hg19: chr18-32335957;