Variation in the distribution of silver-staining nucleolar organizer regions on the chromosomes of the wild mouse, Mus musculus.
A silver staining method was used to analyze the distribution of nucleolar organizer regions (Ag-NORs) on chromosomes of 45 wild mice (Mus musculus). The four subspecies represented were M. m. musculus, M. m. molossinus, M. m. castaneus, and M. m. bactrianus. Ag-NORs were observed near the centromeric regions of 11 chromosomes (4, 8, 9, 10, 11, 12, 15, 16, 17, 18, and 19), indicating a preponderance of Ag-NORs on smaller chromosomes. The first five loci have not been observed previously. It is suggested that a correlation may exist between the specific features of mouse Ag-NORs and the events involved in intra- and interchromosomal homogenization of rDNA.
National Institute of Genetics, Japan.
H
H
Suzuki
Y
Y
Kurihara
T
T
Kanehisa
K
K
Moriwaki
D000818:Animals; D002875:Chromosomes / Q000648:ultrastructure*; D051379:Mice; D009697:Nucleolus Organizer Region / Q000648:ultrastructure*; D012150:Polymorphism, Restriction Fragment Length; D012834:Silver; D013194:Staining and Labeling
D012834:Silver