A note on the presence of B chromosome in the small Japanese field mouse, Apodemus argenteus, in Central Honshu, Japan.
Previously, many studies have revealed the presence of B chromosomes in wild mouse taxa of the genus Apodemus (Rodentia, Muridae). In one of the Apodemus species, A. argenteus, which is endemic to Japan, it is known that B chromosomes were confirmed only in individuals (2n = 46 + B chromosome) from Hokkaido, Japan. There is no report of the presence of B chromosomes from other localities in the Japanese Islands. In this study, we analyzed the chromosomal constitutions of 43 individuals of A. argenteus from three localities in Honshu, Japan. A total of three individuals from central Honshu showed 2n = 47, and each individual carrieda dot-like B chromosome. In addition, these B chromosome features were analyzed by differential staining methods, and the C- and QM-banding patterns of the B chromosomes were identical to those of the X chromosomal heterochromatic region showing the delayed-fluorescent response. Thus, it is considered that these B chromosomes would be derived from the heterochromatin of the X chromosomes, as reported in previously published papers.
Y
Y
Haga
M A
MA
Iwasa
D000818:Animals; D033481:Chromosomes, Mammalian / Q000235:genetics*; D006570:Heterochromatin / Q000235:genetics*; D007564:Japan; D051189:Murinae / Q000235:genetics*; D014960:X Chromosome / Q000235:genetics*
D006570:Heterochromatin