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  1. No Access

    Article

    The ZW sex chromosomes of Gekko hokouensis (Gekkonidae, Squamata) represent highly conserved homology with those of avian species

    Populations of the gecko lizard Gekko hokouensis (Gekkonidae, Squamata) on Okinawajima Island and a few other islands of the Ryukyu Archipelago, Japan, have the morphologically differentiated sex chromosomes, the...

    Aya Kawai, Junko Ishijima, Chizuko Nishida, Ayumi Kosaka, Hidetoshi Ota… in Chromosoma (2009)

  2. No Access

    Article

    Characterization of chromosome structures of Falconinae (Falconidae, Falconiformes, Aves) by chromosome painting and delineation of chromosome rearrangements during their differentiation

    Karyotypes of most bird species are characterized by around 2n = 80 chromosomes, comprising 7–10 pairs of large- and medium-sized macrochromosomes including sex chromosomes and numerous morphologically indisti...

    Chizuko Nishida, Junko Ishijima, Ayumi Kosaka, Hideyuki Tanabe… in Chromosome Research (2008)

  3. No Access

    Article

    The molecular basis of chromosome orthologies and sex chromosomal differentiation in palaeognathous birds

    Palaeognathous birds (Struthioniformes and Tinamiformes) have morphologically conserved karyotypes and less differentiated ZW sex chromosomes. To delineate interspecific chromosome orthologies in palaeognathou...

    Chizuko Nishida-Umehara, Yayoi Tsuda, Junko Ishijima, Junko Ando… in Chromosome Research (2007)

  4. No Access

    Article

    Two variable lymphocyte receptor genes of the inshore hagfish are located far apart on the same chromosome

    Variable lymphocyte receptors (VLR) generate enormous diversity through assembling highly diverse leucine-rich repeat (LRR) modules and presumably function as antigen receptors in jawless vertebrates. The hagf...

    Jun Kasamatsu, Takashi Suzuki, Junko Ishijima, Yoichi Matsuda… in Immunogenetics (2007)

  5. No Access

    Article

    Comparison of the Z and W sex chromosomal architectures in elegant crested tinamou (Eudromia elegans) and ostrich (Struthio camelus) and the process of sex chromosome differentiation in palaeognathous birds

    To clarify the process of avian sex chromosome differentiation in palaeognathous birds, we performed molecular and cytogenetic characterization of W chromosome-specific repetitive DNA sequences for elegant cre...

    Yayoi Tsuda, Chizuko Nishida-Umehara, Junko Ishijima, Kazuhiko Yamada… in Chromosoma (2007)

  6. No Access

    Article

    A novel family of repetitive DNA sequences amplified site-specifically on the W chromosomes in Neognathous birds

    A novel family of repetitive DNA sequences was molecularly cloned from ApaI-digested genomic DNA of two Galliformes species, Japanese quail (Coturnix japonica) and guinea fowl (Numida meleagris), and characterize...

    Kazuhiko Yamada, Chizuko Nishida-Umehara, Junko Ishijima… in Chromosome Research (2006)

  7. No Access

    Article

    cDNA-based gene map** and GC3 profiling in the soft-shelled turtle suggest a chromosomal size-dependent GC bias shared by sauropsids

    Mammalian and avian genomes comprise several classes of chromosomal segments that vary dramatically in GC-content. Especially in chicken, microchromosomes exhibit a higher GC-content and a higher gene density ...

    Shigehiro Kuraku, Junko Ishijima, Chizuko Nishida-Umehara… in Chromosome Research (2006)

  8. No Access

    Article

    Highly conserved linkage homology between birds and turtles: Bird and turtle chromosomes are precise counterparts of each other

    The karyotypes of birds, turtles and snakes are characterized by two distinct chromosomal components, macrochromosomes and microchromosomes. This close karyological relationship between birds and reptiles has ...

    Yoichi Matsuda, Chizuko Nishida-Umehara, Hiroshi Tarui… in Chromosome Research (2005)

  9. No Access

    Article

    Development and implementation of a database system to manage a large-scale mouse ENU-mutagenesis program

    A mouse ENU-mutagenesis program at RIKEN GSC has been initiated to conduct a large-scale, genome-wide, early- and late-onset phenotypic screen of mutant mice. We screened about a hundred mice every week with a...

    Hiroshi Masuya, Yuji Nakai, Hiromi Motegi, Norio Niinaya, Yuichiro Kida… in Mammalian Genome (2004)