Chromosome analysis of postimplantation stage embryos for studying possible causes of developmental abnormalities in nonobese diabetic mice.
The chromosomes of postimplantation stage embryos of nonobese diabetic (NOD) mice were analyzed to investigate the causal mechanism of congenital anomalies in diabetic pregnancies. Postimplantation stage embryos (day 12 of gestation) in diabetic (NOD-DM) and nondiabetic (NOD-N) NOD mice had either a high or low incidence of chromosomal abnormalities. A large majority of externally normal embryos from NOD-DM and NOD-N mice had low incidences. A high incidence of chromosomal abnormalities was found in externally abnormal embryos of NOD-DM and NOD-N mice, and in a smaller number of externally normal NOD-N and NOD-DM embryos. No control ICR embryo manifested a high incidence of chromosomal abnormalities. In the NOD-DM embryos, the chromosomes appeared to be influenced by long-term maternal diabetic conditions, while high incidences of chromosomal abnormalities in the NOD-N embryos suggested a probable cause by other factor(s) (e.g. a genetic predisposition) or by a very mild diabetic condition because the NOD-N mice were prediabetic.
Tatewaki
R
R
Department of Biology, Shimane Medical University, Izumo, Japan.
Otani
H
H
Ando
S
S
Hashimoto
R
R
Naora
H
H
Tanaka
O
O
D000818:Animals; D002869:Chromosome Aberrations / Q000196:embryology* / Q000235:genetics / Q000503:physiopathology; D025063:Chromosome Disorders; D003922:Diabetes Mellitus, Type 1 / Q000196:embryology* / Q000235:genetics / Q000503:physiopathology; D047108:Embryonic Development; D005260:Female; D005315:Fetal Diseases / Q000196:embryology* / Q000235:genetics / Q000503:physiopathology; D008098:Litter Size; D051379:Mice; D008813:Mice, Inbred ICR; D016688:Mice, Inbred NOD; D011247:Pregnancy; D011254:Pregnancy in Diabetics / Q000196:embryology* / Q000235:genetics / Q000503:physiopathology