22-28725028-G-C

Variant names:

• chr22-28725028-G-C
• rs137853010
• NM_007194.4:c.541C>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_007194.4(CHEK2):​c.541C>G​(p.Arg181Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R181C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHEK2 NM_007194.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.67

Genes affected

CHEK2 (HGNC:16627): (checkpoint kinase 2) In response to DNA damage and replication blocks, cell cycle progression is halted through the control of critical cell cycle regulators. The protein encoded by this gene is a cell cycle checkpoint regulator and putative tumor suppressor. It contains a forkhead-associated protein interaction domain essential for activation in response to DNA damage and is rapidly phosphorylated in response to replication blocks and DNA damage. When activated, the encoded protein is known to inhibit CDC25C phosphatase, preventing entry into mitosis, and has been shown to stabilize the tumor suppressor protein p53, leading to cell cycle arrest in G1. In addition, this protein interacts with and phosphorylates BRCA1, allowing BRCA1 to restore survival after DNA damage. Mutations in this gene have been linked with Li-Fraumeni syndrome, a highly penetrant familial cancer phenotype usually associated with inherited mutations in TP53. Also, mutations in this gene are thought to confer a predisposition to sarcomas, breast cancer, and brain tumors. This nuclear protein is a member of the CDS1 subfamily of serine/threonine protein kinases. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-28725028-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHEK2	NM_007194.4	c.541C>G	p.Arg181Gly	missense_variant	Exon 4 of 15	ENST00000404276.6	NP_009125.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHEK2	ENST00000404276.6	c.541C>G	p.Arg181Gly	missense_variant	Exon 4 of 15	1	NM_007194.4	ENSP00000385747.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Sep 15, 2020

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Hereditary cancer-predisposing syndrome Uncertain:1

Jun 28, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.R181G variant (also known as c.541C>G), located in coding exon 3 of the CHEK2 gene, results from a C to G substitution at nucleotide position 541. The arginine at codon 181 is replaced by glycine, an amino acid with dissimilar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Uncertain	0.012	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T;.;T;T;.;T;.;.;D
Eigen	Benign	-0.080
Eigen_PC	Benign	-0.00078
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.93	.;D;.;.;D;D;.;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.60	D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.014	D
MutationAssessor	Uncertain	2.2	M;M;M;M;.;M;M;.;.
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-2.3	N;N;N;N;N;.;N;N;.
REVEL	Uncertain	0.39
Sift	Benign	0.34	T;T;T;T;T;.;T;T;.
Sift4G	Benign	0.41	T;T;T;T;T;.;T;T;T
Polyphen		0.10	B;B;B;B;P;B;B;.;.
Vest4		0.43
MutPred		0.68		Gain of ubiquitination at K177 (P = 0.0329);Gain of ubiquitination at K177 (P = 0.0329);Gain of ubiquitination at K177 (P = 0.0329);Gain of ubiquitination at K177 (P = 0.0329);.;Gain of ubiquitination at K177 (P = 0.0329);Gain of ubiquitination at K177 (P = 0.0329);.;Gain of ubiquitination at K177 (P = 0.0329);
MVP		0.94
MPC		0.040
ClinPred		0.74	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.52
gMVP		0.60

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

LitVar

Other links and lift over

dbSNP: rs137853010; hg19: chr22-29121016;