rs1085307446

Positions:

• chr5-64785579-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP5_Moderate

The NM_005869.4(CWC27):​c.495G>A​(p.Glu165Glu) variant causes a splice region, synonymous change. The variant allele was found at a frequency of 0.00000352 in 1,422,264 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: CWC27 NM_005869.4 splice_region, synonymous
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.63

Genes affected

CWC27 (HGNC:10664): (CWC27 spliceosome associated cyclophilin) Predicted to enable peptidyl-prolyl cis-trans isomerase activity. Predicted to be involved in protein peptidyl-prolyl isomerization. Located in nucleoplasm. Part of U2-type precatalytic spliceosome and catalytic step 2 spliceosome. [provided by Alliance of Genome Resources, Apr 2022]

CWC27 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-64785579-G-A is Pathogenic according to our data. Variant chr5-64785579-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 426071.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr5-64785579-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CWC27	NM_005869.4	c.495G>A	p.Glu165Glu	splice_region_variant, synonymous_variant	5/14	ENST00000381070.8	NP_005860.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CWC27	ENST00000381070.8	c.495G>A	p.Glu165Glu	splice_region_variant, synonymous_variant	5/14	1	NM_005869.4	ENSP00000370460.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000352 AC: 5 AN: 1422264 Hom.: 0 Cov.: 25 AF XY: 0.00000423 AC XY: 3 AN XY: 708998

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000460

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Metaphyseal chondrodysplasia-retinitis pigmentosa syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 11, 2017

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 07, 2022

For these reasons, this variant has been classified as Pathogenic. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in inclusion of intron 5 and introduces a premature termination codon (PMID: 28285769). The resulting mRNA is expected to undergo nonsense-mediated decay. ClinVar contains an entry for this variant (Variation ID: 426071). This variant has been observed in individual(s) with retinitis pigmentosa with or without skeletal abnormalities (PMID: 28285769; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is present in population databases (no rsID available, gnomAD no frequency). This sequence change affects codon 165 of the CWC27 mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the CWC27 protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.17
CADD	Benign	21
DANN	Benign	0.91

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.93		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.93		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1085307446; hg19: chr5-64081406;