rs745646057

Variant names:

• chr22-28725020-C-A
• rs745646057
• NM_007194.4:c.549G>T

Your query was ambiguous. Multiple possible variants found:

• chr22-28725020-C-A
• chr22-28725020-C-G
• chr22-28725020-C-T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PS1_Moderate PM2 PP3_Moderate

The NM_007194.4(CHEK2):​c.549G>T​(p.Leu183Phe) 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 pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L183S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHEK2 NM_007194.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.35
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• CHEK2-related cancer predisposition

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics
• hereditary breast carcinoma

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen
• Li-Fraumeni syndrome 2

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• acute myeloid leukemia

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• familial ovarian cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PS1: Transcript NM_007194.4 (CHEK2) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 184928
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.897

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHEK2	NM_007194.4	c.549G>T	p.Leu183Phe	missense_variant	Exon 4 of 15	ENST00000404276.6	NP_009125.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHEK2	ENST00000404276.6	c.549G>T	p.Leu183Phe	missense_variant	Exon 4 of 15	1	NM_007194.4	ENSP00000385747.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.63	D;.;D;D;.;D;.;.;D
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.89	.;D;.;.;D;D;.;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.90	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	H;H;H;H;.;H;H;.;.
PhyloP100		2.4
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-3.6	D;D;D;D;D;.;D;D;.
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0050	D;D;D;D;D;.;D;D;.
Sift4G	Uncertain	0.0080	D;D;D;D;D;.;D;D;D
Polyphen		1.0	D;D;D;D;D;D;D;.;.
Vest4		0.61
MutPred		0.73		Loss of catalytic residue at L183 (P = 0.0598);Loss of catalytic residue at L183 (P = 0.0598);Loss of catalytic residue at L183 (P = 0.0598);Loss of catalytic residue at L183 (P = 0.0598);.;Loss of catalytic residue at L183 (P = 0.0598);Loss of catalytic residue at L183 (P = 0.0598);.;Loss of catalytic residue at L183 (P = 0.0598);
MVP		0.99
MPC		0.17
ClinPred		0.99	D
GERP RS		3.8
Varity_R		0.96
gMVP		0.69
Mutation Taster		=0/100	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs745646057; hg19: chr22-29121008; COSMIC: COSV60423117; COSMIC: COSV60423117;