Molecular Biology and Evolution, Vol 5, 63-78, Copyright © 1988 by Society for Molecular Biology and Evolution
H Yonekawa, K Moriwaki, O Gotoh, N Miyashita, Y Matsushima, LM Shi, WS Cho, XL Zhen and Y Tagashira
The Japanese mouse, Mus musculus molossinus, has long been considered an
independent subspecies of the house mouse. A survey of restriction- site
haplotypes of mitochondrial DNA (mtDNA) showed that Japanese mice have two
main maternal lineages. The most common haplotype is closely related to the
mtDNA of the European subspecies M. m. musculus. The other common haplotype
and two minor ones are closely related to each other and to the mtDNA of an
Asiatic subspecies, M. m. castaneus. Two other rare variants are probably
the result of recent contamination by European M. m. domesticus. The
musculus type of mtDNA is found in the southern two-thirds of Japan,
whereas the common castaneus type is found in the northern third and the
minor variants are found sporadically throughout Japan. The castaneus mtDNA
lineage had a few minor variants, whereas the musculus lineage was
completely monomorphic. By contrast, the native population of M. m.
castaneus and the Chinese and Korean musculus populations were highly
polymorphic. These results suggest that M. m. molossinus is a hybrid
between ancestral colonies, possibly very small, of M. m. musculus and M.
m. castaneus, rather than an independent subspecies.
ORIGINAL ARTICLE
Hybrid origin of Japanese mice "Mus musculus molossinus": evidence from restriction analysis of mitochondrial DNA
Department of Biochemistry, Saitama Cancer Center Research Institute, Japan.
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