20-59300693-C-A

Variant names:

• chr20-59300693-C-A
• rs886056872
• NM_207034.3:c.-120C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_207034.3(EDN3):​c.-120C>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000238 in 841,042 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000024 (0 hom.)
• Consequence: EDN3 NM_207034.3 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.557
• Publications: 0 publications found

Genes affected

EDN3 (HGNC:3178): (endothelin 3) The protein encoded by this gene is a member of the endothelin family. Endothelins are endothelium-derived vasoactive peptides involved in a variety of biological functions. The active form of this protein is a 21 amino acid peptide processed from the precursor protein. The active peptide is a ligand for endothelin receptor type B (EDNRB). The interaction of this endothelin with EDNRB is essential for development of neural crest-derived cell lineages, such as melanocytes and enteric neurons. Mutations in this gene and EDNRB have been associated with Hirschsprung disease (HSCR) and Waardenburg syndrome (WS), which are congenital disorders involving neural crest-derived cells. Altered expression of this gene is implicated in tumorigenesis. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Oct 2014]

EDN3 Gene-Disease associations (from GenCC):

• Waardenburg syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• Waardenburg syndrome type 4B

  Inheritance: AR, AD, SD Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, PanelApp Australia, G2P
• Waardenburg-Shah syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Hirschsprung disease, susceptibility to, 4

  Inheritance: AD, Unknown Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EDN3	NM_207034.3	c.-120C>A		5_prime_UTR_variant	Exon 1 of 5	ENST00000337938.7	NP_996917.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EDN3	ENST00000337938.7	c.-120C>A		5_prime_UTR_variant	Exon 1 of 5	1	NM_207034.3	ENSP00000337128.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000238 AC: 2 AN: 841042 Hom.: 0 Cov.: 11 AF XY: 0.00000232 AC XY: 1 AN XY: 430482

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 19700

American (AMR) AF: 0.0000370 AC: 1 AN: 27016

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19202

East Asian (EAS) AF: 0.00 AC: 0 AN: 32784

South Asian (SAS) AF: 0.00 AC: 0 AN: 62478

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 35038

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2846

European-Non Finnish (NFE) AF: 0.00000166 AC: 1 AN: 602976

Other (OTH) AF: 0.00 AC: 0 AN: 39002

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.006664), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	7.5
DANN	Benign	0.76
PhyloP100		0.56
PromoterAI		0.021	Neutral

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

Other links and lift over

dbSNP: rs886056872; hg19: chr20-57875748;