Homozygosity for CHEK2 p.Gly167Arg leads to a unique cancer syndrome with multiple complex chromosomal translocations in peripheral blood karyotype.
Dna breakage
acute myeloid leukemia
chek2
chromosomal translocations
multi-organ tumorigenesis
Journal
Journal of medical genetics
ISSN: 1468-6244
Titre abrégé: J Med Genet
Pays: England
ID NLM: 2985087R
Informations de publication
Date de publication:
07 2020
07 2020
Historique:
received:
12
11
2018
revised:
06
02
2019
accepted:
08
02
2019
pubmed:
13
3
2019
medline:
22
6
2021
entrez:
13
3
2019
Statut:
ppublish
Résumé
Chromosomal instability, as reflected by structural or copy-number changes, is a known cancer characteristic but are rarely observed in healthy tissue. Mutations in DNA repair genes disrupt the maintenance of DNA integrity and predispose to hereditary cancer syndromes. To clinically characterise and genetically diagnose two reportedly unrelated patients with unique cancer syndromes, including multiorgan tumourogenesis (patient 1) and early-onset acute myeloid leukaemia (patient 2), both displaying unique peripheral blood karyotypes. Genetic analysis in patient 1 included TruSight One panel and whole-exome sequencing, while patient 2 was diagnosed by FoundationOne Heme genomic analysis; Sanger sequencing was used for mutation confirmation in both patients. Karyotype analysis was performed on peripheral blood, bone marrow and other available tissues. Both patients were found homozygous for The multiple chromosomal translocations in patient lymphocytes highlight the role of CHK2 in DNA repair. We suggest that homozygosity for p.Gly167Arg increases patients' susceptibility to non-accurate correction of DNA breaks and possibly explains their increased susceptibility to either multiple primary tumours during their lifetime or early-onset tumourigenesis.
Sections du résumé
BACKGROUND
Chromosomal instability, as reflected by structural or copy-number changes, is a known cancer characteristic but are rarely observed in healthy tissue. Mutations in DNA repair genes disrupt the maintenance of DNA integrity and predispose to hereditary cancer syndromes.
OBJECTIVE
To clinically characterise and genetically diagnose two reportedly unrelated patients with unique cancer syndromes, including multiorgan tumourogenesis (patient 1) and early-onset acute myeloid leukaemia (patient 2), both displaying unique peripheral blood karyotypes.
METHODS
Genetic analysis in patient 1 included TruSight One panel and whole-exome sequencing, while patient 2 was diagnosed by FoundationOne Heme genomic analysis; Sanger sequencing was used for mutation confirmation in both patients. Karyotype analysis was performed on peripheral blood, bone marrow and other available tissues.
RESULTS
Both patients were found homozygous for
CONCLUSIONS
The multiple chromosomal translocations in patient lymphocytes highlight the role of CHK2 in DNA repair. We suggest that homozygosity for p.Gly167Arg increases patients' susceptibility to non-accurate correction of DNA breaks and possibly explains their increased susceptibility to either multiple primary tumours during their lifetime or early-onset tumourigenesis.
Identifiants
pubmed: 30858171
pii: jmedgenet-2018-105824
doi: 10.1136/jmedgenet-2018-105824
doi:
Substances chimiques
Checkpoint Kinase 2
EC 2.7.1.11
CHEK2 protein, human
EC 2.7.11.1
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
500-504Informations de copyright
© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.
Déclaration de conflit d'intérêts
Competing interests: None declared.