22-28699912-T-C

Position:

chr22-28699912-T-C

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The ENST00000404276.6(CHEK2):c.934A>G(p.Lys312Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,613,896 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. K312R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

CHEK2
ENST00000404276.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 3.19

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 -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.33139163).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHEK2	NM_007194.4 linkuse as main transcript	c.934A>G	p.Lys312Glu	missense_variant	9/15	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.934A>G	p.Lys312Glu	missense_variant	9/15	1	NM_007194.4	ENSP00000385747	P2	O96017-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152126

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000795

AC:

AN:

251418

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135882

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461770

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727192

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

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:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152126

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74310

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

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	Sep 24, 2019	This missense variant replaces lysine with glutamic acid at codon 312 of the CHEK2 protein. Computational prediction tool suggests that this variant may not impact protein structure and function. Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has not been reported in individuals affected with hereditary cancer in the literature. This variant has been identified in 2/251418 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	May 18, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Sep 23, 2022	The p.K312E variant (also known as c.934A>G), located in coding exon 8 of the CHEK2 gene, results from an A to G substitution at nucleotide position 934. The lysine at codon 312 is replaced by glutamic acid, an amino acid with similar properties. This alteration was not observed in 53 unselected male breast cancer patients and was observed with an allele frequency of 0.0001 in 12490 male controls of Japanese ancestry (Momozawa Y et al. Nat Commun, 2018 10;9:4083). This amino acid position is poorly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Familial cancer of breast

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Sep 07, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 21, 2023	This sequence change replaces lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 312 of the CHEK2 protein (p.Lys312Glu). This variant is present in population databases (no rsID available, gnomAD 0.006%). This missense change has been observed in individual(s) with breast cancer and/or thyroid cancer (PMID: 34326862). ClinVar contains an entry for this variant (Variation ID: 422065). 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 provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Aug 21, 2016

This variant is denoted CHEK2 c.934A>G at the cDNA level, p.Lys312Glu (K312E) at the protein level, and results in the change of a Lysine to a Glutamic Acid (AAA>GAA). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. CHEK2 Lys312Glu was not observed at a significant allele frequency in the NHLBI Exome Sequencing Project. Since Lysine and Glutamic Acid differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. CHEK2 Lys312Glu occurs at a position where amino acids with properties similar to Lysine are tolerated across species and is located within the kinase domain (Desrichard 2011, Roeb 2012). In silico analyses are inconsistent regarding the effect this variant may have on protein structure and function. Based on currently available evidence, it is unclear whether CHEK2 Lys312Glu is a pathogenic or benign variant. We consider it to be a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.57

BayesDel_addAF

Benign

-0.064

BayesDel_noAF

Benign

-0.15

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.18

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

Eigen

Benign

-0.17

Eigen_PC

Benign

-0.034

FATHMM_MKL

Uncertain

0.89

LIST_S2

Uncertain

0.93

.;D;.;D;.;D;D;D;.;T;D;D

M_CAP

Benign

0.078

MetaRNN

Benign

0.33

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

MetaSVM

Benign

-0.50

MutationAssessor

Benign

0.49

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

MutationTaster

Benign

0.94

D;D;D;D;D;D;D;D;D;D;N

PrimateAI

Benign

0.43

PROVEAN

Benign

-2.1

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

REVEL

Benign

0.13

Sift

Uncertain

0.0050

D;D;D;.;D;D;.;D;D;T;.;D

Sift4G

Uncertain

0.0070

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

Polyphen

0.071

B;B;B;.;B;B;B;B;B;.;.;.

Vest4

0.48

MutPred

0.55

Loss of ubiquitination at K312 (P = 0.0174);Loss of ubiquitination at K312 (P = 0.0174);Loss of ubiquitination at K312 (P = 0.0174);.;Loss of ubiquitination at K312 (P = 0.0174);.;Loss of ubiquitination at K312 (P = 0.0174);.;Loss of ubiquitination at K312 (P = 0.0174);.;.;.;

MVP

0.93

MPC

0.025

ClinPred

0.42

GERP RS

3.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.48

gMVP

0.47

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