13-77895737-A-G

Position:

• chr13-77895737-A-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_Moderate BS1_Supporting BS2

The NM_001122659.3(EDNRB):​c.*2463T>C variant causes a 3 prime UTR change. The variant allele was found at a frequency of 0.0032 in 152,158 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0032 (6 hom., cov: 32)
  • Failed GnomAD Quality Control
• Consequence: EDNRB NM_001122659.3 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.18

Genes affected

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]

EDNRB-AS1 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.41).
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0032 (487/152158) while in subpopulation AMR AF= 0.00413 (63/15266). AF 95% confidence interval is 0.00331. There are 6 homozygotes in gnomad4. There are 225 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAd4 at 6 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
EDNRB	NM_001122659.3	c.*2463T>C		3_prime_UTR_variant	7/7	ENST00000646607.2
EDNRB-AS1	NR_103853.1	n.1695-11955A>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
EDNRB	ENST00000646607.2	c.*2463T>C		3_prime_UTR_variant	7/7		NM_001122659.3	P1
EDNRB	ENST00000377211.8	c.*2463T>C		3_prime_UTR_variant	8/8	1
EDNRB	ENST00000646605.1	c.*2463T>C		3_prime_UTR_variant	8/8			P1
EDNRB	ENST00000646948.1	c.*2463T>C		3_prime_UTR_variant	8/8			P1

Frequencies

GnomAD3 genomes AF: 0.00322 AC: 490 AN: 152040 Hom.: 6 Cov.: 32

Gnomad AFR AF: 0.00227

Gnomad AMI AF: 0.0121

Gnomad AMR AF: 0.00413

Gnomad ASJ AF: 0.0239

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.0127

Gnomad NFE AF: 0.00327

Gnomad OTH AF: 0.00479

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

GnomAD4 genome AF: 0.00320 AC: 487 AN: 152158 Hom.: 6 Cov.: 32 AF XY: 0.00302 AC XY: 225 AN XY: 74382

Gnomad4 AFR AF: 0.00224

Gnomad4 AMR AF: 0.00413

Gnomad4 ASJ AF: 0.0239

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.00327

Gnomad4 OTH AF: 0.00474

Alfa AF: 0.00292 Hom.: 1

Bravo AF: 0.00363

Asia WGS AF: 0.00290 AC: 11 AN: 3462

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 12, 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	-0.41
CADD	Benign	9.4
DANN	Benign	0.78

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: rs139792924; hg19: chr13-78469872;