22-28725310-T-C
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2
The NM_007194.4(CHEK2):c.377A>G(p.Asp126Gly) variant causes a missense change. 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. D126H) has been classified as Uncertain significance.
Frequency
Genomes: not found (cov: 32)
Consequence
CHEK2
NM_007194.4 missense
NM_007194.4 missense
Scores
1
12
5
Clinical Significance
Conservation
PhyloP100: 4.71
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]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM1
?
In a domain FHA (size 62) in uniprot entity CHK2_HUMAN there are 27 pathogenic changes around while only 5 benign (84%) in NM_007194.4
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.377A>G | p.Asp126Gly | missense_variant | 3/15 | ENST00000404276.6 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CHEK2 | ENST00000404276.6 | c.377A>G | p.Asp126Gly | missense_variant | 3/15 | 1 | NM_007194.4 | P2 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Feb 22, 2019 | Not observed in large population cohorts (Lek 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Has not been previously published as pathogenic or benign to our knowledge - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 26, 2021 | The p.D126G variant (also known as c.377A>G), located in coding exon 2 of the CHEK2 gene, results from an A to G substitution at nucleotide position 377. The aspartic acid at codon 126 is replaced by glycine, an amino acid with similar properties. This amino acid position is conserved. 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:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | May 27, 2022 | 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: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 220477). This variant has not been reported in the literature in individuals affected with CHEK2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces aspartic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 126 of the CHEK2 protein (p.Asp126Gly). - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
Cadd
Benign
Dann
Uncertain
DEOGEN2
Uncertain
D;.;D;D;.;D;.;.;.;D;.;.
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
M_CAP
Uncertain
D
MetaRNN
Uncertain
D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;M;M;M;.;M;M;.;.;.;.;.
MutationTaster
Benign
D;D;D;D;D;D;D;D;D;D;D
PrimateAI
Benign
T
PROVEAN
Uncertain
D;D;D;D;D;.;D;D;D;.;.;.
REVEL
Uncertain
Sift
Benign
T;T;T;T;T;.;T;D;D;.;.;.
Sift4G
Benign
T;T;T;T;T;.;T;D;D;D;.;.
Polyphen
B;D;B;B;P;B;D;.;.;.;.;.
Vest4
MutPred
Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);.;Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);.;Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);Loss of ubiquitination at K131 (P = 0.0422);
MVP
MPC
0.097
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at