4-5640643-G-C

Variant names:

• chr4-5640643-G-C
• rs186349183
• NM_147127.5:c.1341C>G

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_147127.5(EVC2):​c.1341C>G​(p.Tyr447*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Y447Y) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: EVC2 NM_147127.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 0.448
• Publications: 0 publications found

Genes affected

EVC2 (HGNC:19747): (EvC ciliary complex subunit 2) This gene encodes a protein that functions in bone formation and skeletal development. Mutations in this gene, as well as in a neighboring gene that lies in a head-to-head configuration, cause Ellis-van Creveld syndrome, an autosomal recessive skeletal dysplasia that is also known as chondroectodermal dysplasia. Mutations in this gene also cause acrofacial dysostosis Weyers type, also referred to as Curry-Hall syndrome, a disease that combines limb and facial abnormalities. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2009]

EVC2 Gene-Disease associations (from GenCC):

• acrofacial dysostosis, Weyers type

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet
• Ellis-van Creveld syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, Laboratory for Molecular Medicine

ACMG classification

Our verdict: Pathogenic. The variant received 18 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 4-5640643-G-C is Pathogenic according to our data. Variant chr4-5640643-G-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 2071080.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_147127.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EVC2	NM_147127.5	MANE Select	c.1341C>G	p.Tyr447*	stop_gained	Exon 10 of 22	NP_667338.3
	EVC2	NM_001166136.2		c.1101C>G	p.Tyr367*	stop_gained	Exon 10 of 22	NP_001159608.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EVC2	ENST00000344408.10	TSL:1 MANE Select	c.1341C>G	p.Tyr447*	stop_gained	Exon 10 of 22	ENSP00000342144.5
	EVC2	ENST00000310917.6	TSL:1	c.1101C>G	p.Tyr367*	stop_gained	Exon 10 of 22	ENSP00000311683.2
	EVC2	ENST00000475313.5	TSL:1	n.1101C>G		non_coding_transcript_exon	Exon 10 of 23	ENSP00000431981.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ellis-van Creveld syndrome;C0457013:Curry-Hall syndrome Pathogenic:2

Jan 18, 2022

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.Tyr447*) in the EVC2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in EVC2 are known to be pathogenic (PMID: 17024374, 19810119, 19876929). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with EVC2-related conditions. For these reasons, this variant has been classified as Pathogenic.

May 20, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Pathogenic	35
DANN	Benign	0.97
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.59
FATHMM_MKL	Benign	0.67	D
PhyloP100		0.45
Vest4		0.79
GERP RS		-6.7
Mutation Taster		=4/196	disease causing (fs/PTC)

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: rs186349183; hg19: chr4-5642370;