22-28687820-T-TA

Variant names:

• chr22-28687820-T-TA
• rs541513166
• ENST00000416671.5:n.*1198dupT

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BS2_Supporting

The NM_007194.4(CHEK2):​c.*76dupT variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00168 in 146,112 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0017 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00017 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CHEK2 NM_007194.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.62
• 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_benign. The variant received -1 ACMG points.

• BS2: High AC in GnomAd4 at 246 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHEK2	NM_007194.4	c.*76dupT		3_prime_UTR_variant	Exon 15 of 15	ENST00000404276.6	NP_009125.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHEK2	ENST00000404276.6	c.*76dupT		3_prime_UTR_variant	Exon 15 of 15	1	NM_007194.4	ENSP00000385747.1

Frequencies

GnomAD3 genomes AF: 0.00166 AC: 243 AN: 145994 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00566

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00110

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: 0.0000152

Gnomad OTH AF: 0.000503

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.000170 AC: 173 AN: 1018306 Hom.: 0 Cov.: 13 AF XY: 0.000144 AC XY: 75 AN XY: 522040

African (AFR) AF: 0.00548 AC: 137 AN: 24992

American (AMR) AF: 0.000257 AC: 10 AN: 38898

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23044

East Asian (EAS) AF: 0.00 AC: 0 AN: 36538

South Asian (SAS) AF: 0.0000541 AC: 4 AN: 73980

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 35920

Middle Eastern (MID) AF: 0.000299 AC: 1 AN: 3342

European-Non Finnish (NFE) AF: 0.00000951 AC: 7 AN: 735748

Other (OTH) AF: 0.000305 AC: 14 AN: 45844

GnomAD4 genome AF: 0.00168 AC: 246 AN: 146112 Hom.: 0 Cov.: 32 AF XY: 0.00157 AC XY: 112 AN XY: 71186

African (AFR) AF: 0.00572 AC: 228 AN: 39856

American (AMR) AF: 0.00110 AC: 16 AN: 14600

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3348

East Asian (EAS) AF: 0.00 AC: 0 AN: 4980

South Asian (SAS) AF: 0.00 AC: 0 AN: 4512

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9930

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.0000152 AC: 1 AN: 65714

Other (OTH) AF: 0.000498 AC: 1 AN: 2010

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary breast ovarian cancer syndrome Uncertain:1

Apr 19, 2022

National Health Laboratory Service, Universitas Academic Hospital and University of the Free State

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.6

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: rs541513166; hg19: chr22-29083808;