Genomic stability and tumour suppression by the APC/C cofactor Cdh1.
The anaphase promoting complex or cyclosome (APC/C) is a ubiquitin protein ligase that, together with Cdc20 or Cdh1, targets cell-cycle proteins for degradation. APC/C-Cdh1 specifically promotes protein degradation in late mitosis and G1. Mutant embryos lacking Cdh1 die at E9.5-E10.5 due to defects in the endoreduplication of trophoblast cells and placental malfunction. This lethality is prevented when Cdh1 is expressed in the placenta. Cdh1-deficient cells proliferate inefficiently and accumulate numeric and structural chromosomal aberrations, indicating that Cdh1 contributes to the maintenance of genomic stability. Cdh1 heterozygous animals show increased susceptibility to spontaneous tumours, suggesting that Cdh1 functions as a haploinsufficient tumour suppressor. These heterozygous mice also show several defects in behaviour associated with increased proliferation of stem cells in the nervous system. These results indicate that Cdh1 is required for preventing unscheduled proliferation of specific progenitor cells and protecting mammalian cells from genomic instability.
Cell Division and Cancer Group, Centro Nacional de Investigaciones Oncológicas (CNIO), Madrid, Spain.
Irene
I
García-Higuera
Eusebio
E
Manchado
Pierre
P
Dubus
Marta
M
Cañamero
Juan
J
Méndez
Sergio
S
Moreno
Marcos
M
Malumbres
D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001921:Brain / Q000002:abnormalities / Q000166:cytology / Q000502:physiology; D064200:Cdh1 Proteins; D002453:Cell Cycle / Q000502:physiology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D049109:Cell Proliferation; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D004622:Embryo, Mammalian / Q000033:anatomy & histology / Q000473:pathology / Q000502:physiology; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D042822:Genomic Instability; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D009369:Neoplasms / Q000378:metabolism / Q000473:pathology; D010920:Placenta / Q000002:abnormalities / Q000378:metabolism; D011247:Pregnancy; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D043743:Ubiquitin-Protein Ligase Complexes / Q000235:genetics / Q000378:metabolism*
D064200:Cdh1 Proteins; D018797:Cell Cycle Proteins; C577585:Fzr1 protein, mouse; D025521:Tumor Suppressor Proteins; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome