rs730881700

Positions:

chr22-28695133-C-CT

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_007194.4(CHEK2):c.1368_1369insA(p.Glu457ArgfsTer33) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000262 in 1,602,678 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000026 ( 0 hom. )

Consequence

CHEK2
NM_007194.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:14

Conservation

PhyloP100: -0.439

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 Pathogenic. Variant got 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 22-28695133-C-CT is Pathogenic according to our data. Variant chr22-28695133-C-CT is described in ClinVar as [Likely_pathogenic]. Clinvar id is 182450.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHEK2	NM_007194.4 linkuse as main transcript	c.1368_1369insA	p.Glu457ArgfsTer33	frameshift_variant	12/15	ENST00000404276.6	NP_009125.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHEK2	ENST00000404276.6 linkuse as main transcript	c.1368_1369insA	p.Glu457ArgfsTer33	frameshift_variant	12/15	1	NM_007194.4	ENSP00000385747	P2	O96017-1

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152216

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251012

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135666

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000441

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000255

AC:

AN:

1450462

Hom.:

Cov.:

AF XY:

0.0000235

AC XY:

AN XY:

722434

show subpopulations

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:

0.0000750

Gnomad4 NFE exome

AF:

0.0000290

Gnomad4 OTH exome

AF:

0.0000167

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152216

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74356

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:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000340

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:14

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial cancer of breast

Pathogenic:6

Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Mar 08, 2023	This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 24, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Jan 09, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 02, 2018	Variant summary: CHEK2 c.1368dupA (p.Glu457ArgfsX33) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. At least one publication reports experimental evidence evaluating an impact on protein function, which demonstrated that the truncated protein product is localizes exclusively to the cytoplasm, suggesting the 1368dupA mutant to be nonfunctional, as the main substrates for CHK2 phosphorylation are located in the nucleus (Staalesen 2004). The variant allele was found at a frequency of 2.4e-05 in 245848 control chromosomes. This frequency is not significantly higher than expected for a pathogenic variant in CHEK2 causing Hereditary Breast and Ovarian Cancer (2.4e-05 vs 0.00031), allowing no conclusion about variant significance; moreover pseudogene interference might also affect the validity of these frequency results. c.1368dupA has been reported in the literature in multiple individuals affected with Hereditary Breast and Ovarian Cancer (Tung 2016, Susswein 2016, Leedom 2016). These data indicate that the variant is very likely to be associated with disease. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. All laboratories classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Genetics and Molecular Pathology, SA Pathology	Feb 26, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	This sequence change creates a premature translational stop signal (p.Glu457Argfs*33) in the CHEK2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CHEK2 are known to be pathogenic (PMID: 21876083, 24713400). This variant is present in population databases (rs730881700, gnomAD 0.004%). This premature translational stop signal has been observed in individual(s) with breast cancer (PMID: 26681312, 26976419, 28724667). ClinVar contains an entry for this variant (Variation ID: 182450). For these reasons, this variant has been classified as Pathogenic. -

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 14, 2023	Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 27751358, 30322717, 26689913, 29625052, 26681312, 26976419, 29356917, 28724667, 30487145, 31060593, 32906215, 33925588, 32805687, 29922827, 34308104) -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2024	CHEK2: PVS1, PM2, PS4:Moderate -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jan 08, 2021	This frameshift variant causes the premature termination of CHEK2 protein synthesis. It has been reported in individuals affected with breast cancer in the published literature (PMID: 28724667 (2017), 26976419 (2016), 26681312 (2015), 15361853 (2004)). Additionally, tumor staining and in vitro analysis found that the truncated protein was mislocalized and found only in the cytoplasm, thus confirming a damaging effect of this variant on CHEK2 protein function (PMID: 15361853 (2004)). The frequency of this variant in the general population is consistent with pathogenicity. Therefore, the variant is classified as pathogenic. -

Hereditary cancer-predisposing syndrome

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Sep 05, 2023	This variant inserts 1 nucleotide in exon 12 of the CHEK2 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in multiple individuals affected with breast cancer (PMID: 26681312, 26976419, 28724667, 33925588; Color internal data). In a large breast cancer case-control study conducted by the BRIDGES consortium, this variant was reported in 3/60466 cases and 5/53461 unaffected controls (PMID: 33471991; Leiden Open Variation Database DB-ID CHEK2_000164). This variant has been identified in 5/251012 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of CHEK2 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Oct 15, 2021	The c.1368dupA pathogenic mutation, located in coding exon 11 of the CHEK2 gene, results from a duplication of A at nucleotide position 1368, causing a translational frameshift with a predicted alternate stop codon (p.E457Rfs*33). In a cohort of 488 consecutive patients with breast cancer that underwent next generation sequencing of 25 cancer predisposition genes, this mutation was identified in one non-Ashkenazi Jewish woman who was diagnosed at age 42 (Tung N et al. J. Clin. Oncol. 2016 May;34:1460-8). This mutation has also been reported in 6 individuals from a cohort of 45879 patients who underwent multi-gene panel testing including CHEK2 (Leedom TP et al. Cancer Genet. 2016 Sep;209:403-407), in 1 of 10030 individuals undergoing hereditary cancer panel testing through a clinical laboratory (Susswein LR et al. Genet. Med. 2016 Aug;18:823-32), and in 1 of 8085 consecutive unrelated Chinese breast cancer patients who underwent multi-gene panel testing (Sun J et al. Clin. Cancer Res. 2017 Oct;23:6113-6119). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -
Pathogenic, criteria provided, single submitter	curation	Sema4, Sema4	Oct 06, 2021	- -

CHEK2-related disorder

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 19, 2024

The CHEK2 c.1368dupA variant is predicted to result in a frameshift and premature protein termination (p.Glu457Argfs*33). This variant was reported in individuals with breast cancer (Table S1, Susswein et al. 2016. PubMed ID: 26681312; Table S3, Sun et al. 2017. PubMed ID: 28724667), ovarian cancer (Table S1, Carter et al. 2018. PubMed ID: 30322717), and colorectal cancer (referred to as c.1497_1498insA in Table S1, DeRycke et al. 2017. PubMed ID: 28944238). This variant is reported in 0.0044% of alleles in individuals of European (Non-Finnish) descent in gnomAD and is interpreted as likely pathogenic/pathogenic in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/182450/). Frameshift variants in CHEK2 are expected to be pathogenic. This variant is interpreted as pathogenic. -

CHEK2-related cancer predisposition

Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

Snyder Lab, Genetics Department, Stanford University

Jan 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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