rs369070738

chr22-28695755-T-Achr22-28695755-T-Cchr22-28695755-T-G

Variant summary

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

The NM_007194.4(CHEK2):c.1214A>T(p.Asn405Ile) 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. N405K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHEK2 NM_007194.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.87

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHEK2	NM_007194.4	c.1214A>T	p.Asn405Ile	missense_variant	11/15	ENST00000404276.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHEK2	ENST00000404276.6	c.1214A>T	p.Asn405Ile	missense_variant	11/15	1	NM_007194.4	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial cancer of breast Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 03, 2020

This sequence change replaces asparagine with isoleucine at codon 405 of the CHEK2 protein (p.Asn405Ile). The asparagine residue is weakly conserved and there is a large physicochemical difference between asparagine and isoleucine. This variant is not present in population databases (ExAC no frequency). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CHEK2-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Benign	-0.035	T
BayesDel_noAF	Benign	-0.29
Cadd	Benign	22
Dann	Uncertain	0.99
DEOGEN2	Benign	0.27	T;.;T;.;T;.;T;.;.
Eigen	Benign	0.12
Eigen_PC	Benign	0.17
FATHMM_MKL	Uncertain	0.80	D
M_CAP	Benign	0.051	D
MetaRNN	Uncertain	0.60	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	1.5	L;.;L;.;L;.;L;.;.
MutationTaster	Benign	1.0	D;D;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.43	T
PROVEAN	Uncertain	-2.5	N;D;N;.;N;D;.;D;D
REVEL	Benign	0.17
Sift	Uncertain	0.0090	D;D;D;.;D;D;.;D;D
Sift4G	Uncertain	0.010	D;D;D;.;D;D;.;D;D
Polyphen		0.31	B;P;B;.;B;B;B;P;P
Vest4		0.69
MutPred		0.71		Gain of catalytic residue at G403 (P = 0.167);.;Gain of catalytic residue at G403 (P = 0.167);.;Gain of catalytic residue at G403 (P = 0.167);.;Gain of catalytic residue at G403 (P = 0.167);.;.;
MVP		0.63
MPC		0.043
ClinPred		0.95	D
GERP RS		3.4
Varity_R		0.46
gMVP		0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs369070738; hg19: chr22-29091743;