NM_007194.4:c.673A>C

Variant names:

• chr22-28719405-T-G
• rs1555924390
• NM_007194.4:c.673A>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_007194.4(CHEK2):​c.673A>C​(p.Thr225Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000701 in 1,426,686 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. T225S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: CHEK2 NM_007194.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 3.10
• Publications: 1 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, ClinGen
• Li-Fraumeni syndrome 2

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• hereditary breast carcinoma

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• acute myeloid leukemia

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

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

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 52 uncertain in NM_007194.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36086822).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007194.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHEK2	NM_007194.4	MANE Select	c.673A>C	p.Thr225Pro	missense	Exon 5 of 15	NP_009125.1	O96017-1
	CHEK2	NM_001005735.3		c.802A>C	p.Thr268Pro	missense	Exon 6 of 16	NP_001005735.1
	CHEK2	NM_001438293.1		c.766A>C	p.Thr256Pro	missense	Exon 6 of 16	NP_001425222.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHEK2	ENST00000404276.6	TSL:1 MANE Select	c.673A>C	p.Thr225Pro	missense	Exon 5 of 15	ENSP00000385747.1	O96017-1
	CHEK2	ENST00000382580.6	TSL:1	c.802A>C	p.Thr268Pro	missense	Exon 6 of 16	ENSP00000372023.2	O96017-9
	CHEK2	ENST00000403642.5	TSL:1	c.400A>C	p.Thr134Pro	missense	Exon 2 of 12	ENSP00000384919.1	O96017-4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.01e-7 AC: 1 AN: 1426686 Hom.: 0 Cov.: 27 AF XY: 0.00000141 AC XY: 1 AN XY: 709106

African (AFR) AF: 0.00 AC: 0 AN: 32748

American (AMR) AF: 0.00 AC: 0 AN: 41582

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25224

East Asian (EAS) AF: 0.00 AC: 0 AN: 39228

South Asian (SAS) AF: 0.00 AC: 0 AN: 82150

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52008

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4896

European-Non Finnish (NFE) AF: 9.17e-7 AC: 1 AN: 1089962

Other (OTH) AF: 0.00 AC: 0 AN: 58888

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Familial cancer of breast (1)
-	1	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.22
Eigen_PC	Benign	0.0095
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.0069	T
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.35	N
PhyloP100		3.1
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.20
Sift	Benign	0.27	T
Sift4G	Benign	0.33	T
Polyphen		0.013	B
Vest4		0.42
MutPred		0.63		Gain of catalytic residue at T225 (P = 0.06)
MVP		0.76
MPC		0.021
ClinPred		0.75	D
GERP RS		5.5
Varity_R		0.82
gMVP		0.68
Mutation Taster		=65/35	polymorphism

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

Other links and lift over

dbSNP: rs1555924390; hg19: chr22-29115393;