2-179945281-T-C

Variant names:

• chr2-179945281-T-C
• NM_020943.3:c.2575A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020943.3(CWC22):​c.2575A>G​(p.Arg859Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,504 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CWC22 NM_020943.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.54

Genes affected

CWC22 (HGNC:29322): (CWC22 spliceosome associated protein homolog) Enables RNA binding activity. Involved in mRNA splicing, via spliceosome. Located in cytosol and nuclear speck. Part of U2-type catalytic step 1 spliceosome; U2-type catalytic step 2 spliceosome; and U2-type precatalytic spliceosome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1051659).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CWC22	NM_020943.3	c.2575A>G	p.Arg859Gly	missense_variant	Exon 20 of 20	ENST00000410053.8	NP_065994.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CWC22	ENST00000410053.8	c.2575A>G	p.Arg859Gly	missense_variant	Exon 20 of 20	1	NM_020943.3	ENSP00000387006.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461504 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727010

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2575A>G (p.R859G) alteration is located in exon 20 (coding exon 19) of the CWC22 gene. This alteration results from a A to G substitution at nucleotide position 2575, causing the arginine (R) at amino acid position 859 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	18
DANN	Benign	0.97
DEOGEN2	Benign	0.064	T
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.38
FATHMM_MKL	Benign	0.44	N
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	2.0	M
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-2.2	N
REVEL	Benign	0.040
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.015	D
Polyphen		0.0050	B
Vest4		0.17
MutPred		0.28		Loss of solvent accessibility (P = 0.0053);
MVP		0.20
MPC		0.15
ClinPred		0.28	T
GERP RS		5.2
Varity_R		0.12
gMVP		0.11

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-180810008;