chr22-28703528-T-A

Position:

• chr22-28703528-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_007194.4(CHEK2):​c.885A>T​(p.Glu295Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. E295K) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CHEK2 NM_007194.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 1.91

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-28703530-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1495830.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHEK2	NM_007194.4	c.885A>T	p.Glu295Asp	missense_variant	8/15	ENST00000404276.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHEK2	ENST00000404276.6	c.885A>T	p.Glu295Asp	missense_variant	8/15	1	NM_007194.4	P2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial cancer of breast Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Dec 05, 2023	This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 295 of the CHEK2 protein (p.Glu295Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CHEK2-related conditions. ClinVar contains an entry for this variant (Variation ID: 822778). 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Sep 05, 2023	- -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 27, 2019

The p.E295D variant (also known as c.885A>T), located in coding exon 7 of the CHEK2 gene, results from an A to T substitution at nucleotide position 885. The glutamic acid at codon 295 is replaced by aspartic acid, an amino acid with highly similar properties. This amino acid position is highly 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.095
BayesDel_addAF	Uncertain	0.063	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.097	T;.;T;.;T;.;T;.;.;.;.;.
Eigen	Benign	0.18
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.77	.;T;.;T;.;T;T;T;.;T;T;T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.28	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	0.29	N;N;N;.;N;.;N;.;N;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-0.86	N;N;N;.;N;N;.;N;N;N;.;N
REVEL	Benign	0.21
Sift	Benign	0.18	T;T;T;.;T;T;.;T;T;T;.;T
Sift4G	Benign	0.47	T;T;T;.;T;T;.;T;T;T;.;.
Polyphen		0.0	B;B;B;.;B;B;B;B;B;.;.;.
Vest4		0.40
MutPred		0.35		Gain of phosphorylation at Y297 (P = 0.1354);Gain of phosphorylation at Y297 (P = 0.1354);Gain of phosphorylation at Y297 (P = 0.1354);.;Gain of phosphorylation at Y297 (P = 0.1354);.;Gain of phosphorylation at Y297 (P = 0.1354);.;Gain of phosphorylation at Y297 (P = 0.1354);.;.;.;
MVP		0.71
MPC		0.019
ClinPred		0.74	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.27
gMVP		0.31

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.40		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.40		Position offset: -23

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555916935; hg19: chr22-29099516;