18-34755697-A-G

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_001386795.1(DTNA):c.-1-279A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00475 in 388,908 control chromosomes in the GnomAD database, including 23 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.010 (15 hom., cov: 33)
  • Exomes 𝑓: 0.0014 (8 hom.)
• Consequence: DTNA NM_001386795.1 intron
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.244

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 Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BP6: Variant 18-34755697-A-G is Benign according to our data. Variant chr18-34755697-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 669424.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.01 (1527/152306) while in subpopulation AFR AF= 0.035 (1454/41560). AF 95% confidence interval is 0.0335. There are 15 homozygotes in gnomad4. There are 740 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd at 1520 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DTNA	NM_001386795.1	c.-1-279A>G		intron_variant		ENST00000444659.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DTNA	ENST00000444659.6	c.-1-279A>G		intron_variant		5	NM_001386795.1	P3
	ENST00000596954.1	n.314-62T>C		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes AF: 0.00999 AC: 1520 AN: 152188 Hom.: 15 Cov.: 33

Gnomad AFR AF: 0.0349

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00321

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00764

GnomAD4 exome AF: 0.00136 AC: 322 AN: 236602 Hom.: 8 AF XY: 0.00114 AC XY: 145 AN XY: 127396

Gnomad4 AFR exome AF: 0.0368

Gnomad4 AMR exome AF: 0.00196

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000338

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000357

Gnomad4 OTH exome AF: 0.00147

GnomAD4 genome AF: 0.0100 AC: 1527 AN: 152306 Hom.: 15 Cov.: 33 AF XY: 0.00993 AC XY: 740 AN XY: 74490

Gnomad4 AFR AF: 0.0350

Gnomad4 AMR AF: 0.00320

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00756

Alfa AF: 0.00632 Hom.: 6

Bravo AF: 0.0117

Asia WGS AF: 0.00202 AC: 7 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 14, 2018

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
Cadd	Benign	3.1
Dann	Benign	0.72

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

Other links and lift over

dbSNP: rs6650657; hg19: chr18-32335661;