chr4-5804735-AG-A

Variant names:

• chr4-5804735-AG-A
• rs794726666
• NM_153717.3:c.2457delG

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_153717.3(EVC):​c.2457delG​(p.Met820TrpfsTer108) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. R819R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: EVC NM_153717.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.82
• Publications: 1 publications found

Genes affected

EVC (HGNC:3497): (EvC ciliary complex subunit 1) This gene encodes a protein containing a leucine zipper and a transmembrane domain. This gene has been implicated in both Ellis-van Creveld syndrome (EvC) and Weyers acrodental dysostosis. [provided by RefSeq, Jul 2008]

CRMP1 (HGNC:2365): (collapsin response mediator protein 1) This gene encodes a member of a family of cytosolic phosphoproteins expressed exclusively in the nervous system. The encoded protein is thought to be a part of the semaphorin signal transduction pathway implicated in semaphorin-induced growth cone collapse during neural development. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-5804735-AG-A is Pathogenic according to our data. Variant chr4-5804735-AG-A is described in ClinVar as Pathogenic. ClinVar VariationId is 5344.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EVC	NM_153717.3	c.2457delG	p.Met820TrpfsTer108	frameshift_variant	Exon 17 of 21	ENST00000264956.11	NP_714928.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EVC	ENST00000264956.11	c.2457delG	p.Met820TrpfsTer108	frameshift_variant	Exon 17 of 21	1	NM_153717.3	ENSP00000264956.6
CRMP1	ENST00000506216.5	n.1647+20758delC		intron_variant	Intron 12 of 12	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Ellis-van Creveld syndrome;C0457013:Curry-Hall syndrome Pathogenic:1

Jul 31, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Met820Trpfs*108) in the EVC gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in EVC are known to be pathogenic (PMID: 23220543). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Ellis-van Creveld syndrome (PMID: 10700184). This variant is also known as 2456delG. ClinVar contains an entry for this variant (Variation ID: 5344). For these reasons, this variant has been classified as Pathogenic. -

Ellis-van Creveld syndrome Pathogenic:1

Mar 01, 2000

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.8
Mutation Taster		=17/183	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs794726666; hg19: chr4-5806462;