RT Journal
A1 Takada, Toyoyuki
A1 Ebata, Toshinobu
A1 Noguchi, Hideki
A1 Keane, Thomas
A1 Adams, David
A1 Narita, Takanori
A1 Shin-I, Tadasu
A1 Fujisawa, Hironori
A1 Toyoda, Atsushi
A1 Abe, Kuniya
A1 Obata, Yuichi
A1 Sakaki, Yoshiyuki
A1 Moriwaki, Kazuo
A1 Fujiyama, Asao
A1 Kohara, Yuji
A1 Shiroishi, Toshihiko
T1 The ancestor of extant Japanese fancy mice contributed to the mosaic genomes of classical inbred strains
JF Genome Research 
JO Genome Research 
YR 2013 
FD April 19 
DO 10.1101/gr.156497.113 
SP gr.156497.113 
UL http://genome.cshlp.org/content/early/2013/04/19/gr.156497.113.abstract 
AB Commonly used classical inbred mouse strains have mosaic genomes with sequences from different subspecific origins. Their genomes are derived predominantly from the Western European subspecies Mus musculus domesticus, with the remaining sequences derived mostly from the Japanese subspecies M. m. molossinus. However, it remains unknown how this intersubspecific genome introgression occurred during the establishment of classical inbred strains. In this study, we resequenced the genomes of M. m. molossinus -derived two inbred strains, MSM/Ms and JF1/Ms. MSM/Ms originated from Japanese wild mice, and ancestry of JF1/Ms was originally found in Europe and then transferred to Japan. We compared the characteristics of these sequences to those of the C57BL/6J reference sequence and the recent datasets from the resequencing of 17 inbred strains in the Mouse Genome Project (MGP), and the results unequivocally show that genome introgression from M. m. molossinus  into M. m. domesticus  provided the primary framework for the mosaic genomes of classical inbred strains. Furthermore, the genomes of C57BL/6J and other classical inbred strains have long consecutive segments with extremely high similarity (>99.998%) to the JF1/Ms strain. In the early 20th century, Japanese waltzing mice with a morphological phenotype resembling that of JF1/Ms mice were often crossed with European fancy mice for early studies of "Mendelism" which suggests that that the ancestor of the extant JF1/Ms strain provided the origin of the M. m. molossinus  genome in classical inbred strains and largely contributed to its intersubspecific genome diversity.