chr22-28687926-G-A

Position:

chr22-28687926-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_007194.4(CHEK2):c.1603C>T(p.Arg535Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000175 in 1,596,260 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. 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. R535H) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

CHEK2
NM_007194.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 2.12

Variant links:

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]

CHEK2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.112244815).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHEK2	NM_007194.4 linkuse as main transcript	c.1603C>T	p.Arg535Cys	missense_variant	15/15	ENST00000404276.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHEK2	ENST00000404276.6 linkuse as main transcript	c.1603C>T	p.Arg535Cys	missense_variant	15/15	1	NM_007194.4	P2	O96017-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000171

AC:

AN:

233674

Hom.:

AF XY:

0.0000156

AC XY:

AN XY:

128330

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000873

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000920

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000187

AC:

AN:

1444066

Hom.:

Cov.:

AF XY:

0.0000181

AC XY:

AN XY:

718778

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000189

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152194

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.00000869

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 22, 2022	This missense variant replaces arginine with cysteine at codon 535 of the CHEK2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with ovarian cancer in the literature (PMID: 30441849). This variant has been identified in 4/233674 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Oct 12, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Apr 03, 2024	The p.R535C variant (also known as c.1603C>T), located in coding exon 14 of the CHEK2 gene, results from a C to T substitution at nucleotide position 1603. The arginine at codon 535 is replaced by cysteine, an amino acid with highly dissimilar properties. This variant was detected in 1/333 Polish patients with ovarian cancer (Koczkowska M et al. Cancers (Basel), 2018 Nov;10:). This amino acid position is well 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. -

Familial cancer of breast

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 26, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 535 of the CHEK2 protein (p.Arg535Cys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individual(s) with ovarian cancer (PMID: 30441849). ClinVar contains an entry for this variant (Variation ID: 182442). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jan 09, 2022

Variant summary: CHEK2 c.1603C>T (p.Arg535Cys) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.7e-05 in 233674 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.1603C>T has been reported in the literature in individuals affected with Breast and Ovarian Cancer (example: Koczkowska_2018, Dorling_2021). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submitters have assessed this variant since 2014: all submitters classified the variant as of uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jul 17, 2017

This variant is denoted CHEK2 c.1603C>T at the cDNA level, p.Arg535Cys (R535C) at the protein level, and results in the change of an Arginine to a Cysteine (CGC>TGC). Using alternate nomenclature, this variant would be defined as CHEK2 1732C>T (R578C). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. Although this variant was observed in large population cohorts, population data in this region of CHEK2 are not considered reliable due to high pseudogene homology (NHLBI Exome Sequencing Project, The 1000 Genomes Consortium 2015, Lek 2016). Since Arginine and Cysteine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. CHEK2 Arg535Cys occurs at a position that is not conserved and is not located in a known functional domain. In silico analyses are inconsistent regarding the effect this variant may have on protein structure and function. Based on currently available information, it is unclear whether CHEK2 Arg535Cys is pathogenic or benign. We consider it to be a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.025

BayesDel_noAF

Benign

-0.27

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.35

T;.;T;.;T;.;T;.;.

Eigen

Benign

-0.13

Eigen_PC

Benign

-0.056

FATHMM_MKL

Benign

0.51

LIST_S2

Uncertain

0.87

.;D;.;D;.;D;D;D;.

M_CAP

Benign

0.042

MetaRNN

Benign

0.11

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.85

MutationAssessor

Benign

0.46

N;.;N;.;N;.;N;.;.

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N;N;N;N

PrimateAI

Uncertain

0.50

PROVEAN

Benign

-1.5

N;N;N;.;N;N;.;N;N

REVEL

Benign

0.062

Sift

Pathogenic

0.0

D;D;D;.;D;D;.;D;D

Sift4G

Benign

0.075

T;T;T;.;T;T;.;T;T

Polyphen

0.033

B;D;B;.;B;B;B;P;D

Vest4

0.23

MutPred

0.31

Loss of MoRF binding (P = 0.0023);.;Loss of MoRF binding (P = 0.0023);.;Loss of MoRF binding (P = 0.0023);.;Loss of MoRF binding (P = 0.0023);.;.;

MVP

0.80

MPC

0.022

ClinPred

0.38

GERP RS

3.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.14

gMVP

0.37

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over