著者

Kazuyuki MEKADA Kuniya ABE Ayumi MURAKAMI Satoe NAKAMURA Hatsumi NAKATA Kazuo MORIWAKI Yuichi OBATA Atsushi YOSHIKI

出版者

公益社団法人 日本実験動物学会

雑誌

Experimental Animals (ISSN:13411357)

巻号頁・発行日

vol.58, no.2, pp.141-149, 2009 (Released:2009-05-16)

参考文献数

33

被引用文献数

76 270

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The C57BL/6 mouse is the most well-known inbred mouse strain, and has been widely used as a genetic background for congenic and mutant mice. A number of C57BL/6 substrains have been derived from the C57BL/6 founder line and are reported to differ in several phenotypes. There are several major sources of C57BL/6 substrains for the biomedical research community. The importance of their genetic and phenotypic differences among substrains, however, has not yet been well recognized by biomedical researchers. Here, we report the result of screening of the functional deletion of the nicotinamide nucleotide transhydrogenase (Nnt) gene and 1,446 SNPs genotyping among seven C57BL/6 substrains from different sources, such as C57BL/6J, C57BL/6JJcl, C57BL/6JJmsSlc, C57BL/6NJcl, C57BL/6NCrlCrlj, C57BL/6NTac, and C57BL/6CrSlc. The deletion of exon 7-11 in the Nnt gene that was previously reported in C57BL/6J was also observed in other C57BL/6J substrains, indicating that this functional deletion probably occurred at an early stage in the establishment of C57BL/6J substrains. The genotyping of SNP loci clearly demonstrate genetic differences between C57BL/6J and C57BL/6N substrains at 11 loci. Besides, we found another SNP differing between C57BL/6J and other C57BL/6J substrains available from commercial breeders. No genetic difference was detected among C57BL/6N substrains. The C57BL/6CrSlc mouse, originally derived from the National Cancer Institute of the NIH was found to be the same as the C57BL/6N substrains by the SNP pattern. These data will be useful for accurate genetic monitoring of genetically engineered mice with the C57BL/6 background.

著者

Taiga YAMAZAKI Satoru KOBAYAKAWA Kazuo YAMAGATA Kuniya ABE Tadashi BABA

出版者

The Society for Reproduction and Development

雑誌

Journal of Reproduction and Development (ISSN:09168818)

巻号頁・発行日

vol.53, no.5, pp.1035-1041, 2007 (Released:2007-10-31)

参考文献数

24

被引用文献数

11 13

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To elucidate the molecular dynamics of HP1β in mouse preimplantation embryos, we examined the localization, dynamics, and mobility of HP1β in the (pro)nucleus by live cell imaging. Time-lapse observation revealed that the chromatin association of HP1β is regulated in a cell cycle-dependent manner. HP1β was localized in the interphase nucleus and was dynamically dissociated from the nucleus during the metaphase stage. The HP1β assembly and clustered heterochromatin structure were both found in the nuclei of 2-cell and later-stage embryos. Moreover, fluorescent recovery after photobleaching analysis implied that HP1β is more freely mobile in the pronucleus of the 1-cell embryo than in the 4-cell nucleus. These results suggest that the chromatin configuration may be regulated by the stability and mobility of chromatin-associated proteins including HP1β during early embryonic stages.