Radiation hybrid maps of medaka chromosomes LG 12, 17, and 22

Feng Su, Yumi Osada, Marc Ekker, Mario Chevrette, Atsushi Shimizu, Shuichi Asakawa, Aiko Shiohama, Takashi Sasaki, Nobuyoshi Shimizu, Toshiyuki Yamanaka, Takao Sasado, Hiroshi Mitani, Robert Geisler, Hisato Kondoh, Makoto Furutani-Seiki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The Medaka is an excellent genetic system for studies of vertebrate development and disease and environmental and evolutionary biology studies. To facilitate the mapping of markers or the cloning of affected genes in Medaka mutants identified by forward-genetic screens, we have established a panel of whole-genome radiation hybrids (RHs) and RH maps for three Medaka chromosomes. RH mapping is useful, since markers to be mapped need not be polymorphic and one can establish the order of markers that are difficult to resolve by genetic mapping owing to low genetic recombination rates. RHs were generated by fusing the irradiated donor, OLF-136 Medaka cell line, with the host B78 mouse melanoma cells. Of 290 initial RH clones, we selected 93 on the basis of high retention of fragments of the Medaka genome to establish a panel that allows genotyping in the 96-well format. RH maps for linkage groups 12, 17, and 22 were generated using 159 markers. The average retention for the three chromosomes was 19 and the average break point frequency was ∼33 kb/cR. We estimate the potential resolution of the RH panel to be ∼186 kb, which is high enough for integrating RH data with bacterial artificial chromosome clones. Thus, this first RH panel will be a useful tool for mapping mutated genes in Medaka.

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalDNA Research
Issue number3
Publication statusPublished - 2007 Jun


  • BAC
  • Genetic mapping
  • Medaka
  • Radiation hybrid mapping

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics


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