chr4-5562641-T-C

Position:

• chr4-5562641-T-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_147127.5(EVC2):​c.*207A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000621 in 1,435,260 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0025 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00040 (3 hom.)
• Consequence: EVC2 NM_147127.5 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.596

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BP6: Variant 4-5562641-T-C is Benign according to our data. Variant chr4-5562641-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 899532.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0025 (381/152170) while in subpopulation AFR AF= 0.00761 (316/41532). AF 95% confidence interval is 0.00692. There are 0 homozygotes in gnomad4. There are 187 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
EVC2	NM_147127.5	c.*207A>G		3_prime_UTR_variant	22/22	ENST00000344408.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
EVC2	ENST00000344408.10	c.*207A>G		3_prime_UTR_variant	22/22	1	NM_147127.5	P2
EVC2	ENST00000310917.6	c.*207A>G		3_prime_UTR_variant	22/22	1		A2
EVC2	ENST00000475313.5	c.3419+2617A>G		intron_variant, NMD_transcript_variant		1

Frequencies

GnomAD3 genomes AF: 0.00250 AC: 380 AN: 152052 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00761

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00308

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000176

Gnomad OTH AF: 0.00239

GnomAD4 exome AF: 0.000398 AC: 511 AN: 1283090 Hom.: 3 Cov.: 31 AF XY: 0.000357 AC XY: 223 AN XY: 624508

Gnomad4 AFR exome AF: 0.00979

Gnomad4 AMR exome AF: 0.00183

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000473

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000124

Gnomad4 OTH exome AF: 0.00106

GnomAD4 genome AF: 0.00250 AC: 381 AN: 152170 Hom.: 0 Cov.: 32 AF XY: 0.00251 AC XY: 187 AN XY: 74380

Gnomad4 AFR AF: 0.00761

Gnomad4 AMR AF: 0.00307

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000176

Gnomad4 OTH AF: 0.00236

Alfa AF: 0.000861 Hom.: 0

Bravo AF: 0.00287

Asia WGS AF: 0.000289 AC: 2 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Ellis-van Creveld syndrome Benign:1

Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	6.6
DANN	Benign	0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs73072282; hg19: chr4-5564368;