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6 papers found.
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Characterisation of major histocompatibility complex class I genes in Japanese Ranidae frogs

The major histocompatibility complex (MHC) is a key component of adaptive immunity in all jawed vertebrates, and understanding the evolutionary mechanisms that have shaped these genes in amphibians, one of the earliest terrestrial tetrapods, is important. We characterised MHC class I variation in three common Japanese Rana species (Rana japonica, Rana ornativentris and Rana tagoi...

Population Structure and Evolution after Speciation of the Hokkaido Salamander (Hynobius retardatus)

The Hokkaido salamander (Hynobius retardatus) is endemic to Hokkaido Island, Japan, and shows intriguing flexible phenotypic plasticity and regional morphological diversity. However, to date, allozymes and partial mitochondria DNA sequences have provided only an outline of its demographic histories and the pattern of its genetic diversification. To understand the finer details of...

Evolutionary history of the extant amphioxus lineage with shallow-branching diversification

, 6061 Aitsu, Kami-Amakusa, Kumamoto, 861-6102, JapanYasuhisa Henmi AuthorsSearch for Takeshi Igawa in:Nature Research journals • PubMed • Google Scholar Search for Masafumi Nozawa in:Nature Research

Genetic divergences of South and Southeast Asian frogs: a case study of several taxa based on 16S ribosomal RNA gene data with notes on the generic name Fejervarya

To elucidate the genetic divergences of several Asian frog taxa, the mitochondrial 16S rRNA gene (16S) sequences of 81 populations across 6 Asian countries were analyzed. In total, 109 haplotypes were found, and the concept of a 3% difference in 16S sequence corresponding to species threshold was applied to define candidate amphibian species, for which corroborating evidence...

Inbreeding Ratio and Genetic Relationships among Strains of the Western Clawed Frog, Xenopus tropicalis

The Western clawed frog, Xenopus tropicalis, is a highly promising model amphibian, especially in developmental and physiological research, and as a tool for understanding disease. It was originally found in the West African rainforest belt, and was introduced to the research community in the 1990s. The major strains thus far known include the Nigerian and Ivory Coast strains...

Divergence, demography and gene loss along the human lineage

Hie Lim Kim Takeshi Igawa Ayaka Kawashima Yoko Satta Naoyuki Takahata ( 0 Present address: Institute of Molecular Evolutionary Genetics and Department of Biology, Pennsylvania