13-77975520-A-T

Position:

• chr13-77975520-A-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Strong BS2

The ENST00000435281.2(ENSG00000233379):​n.20T>A variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00824 in 152,132 control chromosomes in the GnomAD database, including 59 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0082 (59 hom., cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ENST00000435281.2 non_coding_transcript_exon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.949

Genes affected

(HGNC:):

OBI1-AS1 (HGNC:42700): (OBI1 antisense RNA 1)

EDNRB (HGNC:3180): (endothelin receptor type B) The protein encoded by this gene is a G protein-coupled receptor which activates a phosphatidylinositol-calcium second messenger system. Its ligand, endothelin, consists of a family of three potent vasoactive peptides: ET1, ET2, and ET3. Studies suggest that the multigenic disorder, Hirschsprung disease type 2, is due to mutations in the endothelin receptor type B gene. Alternative splicing and the use of alternative promoters results in multiple transcript variants. [provided by RefSeq, Oct 2016]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0).
• BS2: High Homozygotes in GnomAd4 at 59 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
EDNRB	NM_000115.5	c.-225T>A		5_prime_UTR_variant	1/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
	ENST00000435281.2	n.20T>A		non_coding_transcript_exon_variant	1/3	5
OBI1-AS1	ENST00000607862.5	n.230+55602A>T		intron_variant, non_coding_transcript_variant		1
EDNRB	ENST00000646948.1	c.-225T>A		5_prime_UTR_variant	1/8			P1

Frequencies

GnomAD3 genomes AF: 0.00825 AC: 1254 AN: 152016 Hom.: 59 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00289

Gnomad EAS AF: 0.00830

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.100

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00191

Gnomad OTH AF: 0.00432

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 166 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 126

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 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00824 AC: 1253 AN: 152132 Hom.: 59 Cov.: 33 AF XY: 0.0125 AC XY: 928 AN XY: 74354

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00289

Gnomad4 EAS AF: 0.00813

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.100

Gnomad4 NFE AF: 0.00191

Gnomad4 OTH AF: 0.00427

Alfa AF: 0.00609 Hom.: 2

Bravo AF: 0.000763

Asia WGS AF: 0.00289 AC: 10 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hirschsprung disease, susceptibility to, 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	1.3
DANN	Benign	0.15

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs142748526; hg19: chr13-78549655;