Heterochrony and Neotenic Salamanders : Possible Clues for Understanding the Animal Development and Evolution
スポンサーリンク
概要
- 論文の詳細を見る
A synthesis of developmental genetics with evolutionary genetics is now making possible to understand significant evolutionary changes in multicellular organisms. The key concept for unifying the two must be heterochrony. Heterochrony causes evolutionary modifications due to changes in timing and/or rate of development. The heterochrony is conventionally categorized into three patterns as neoteny (retardation in somatic development), progenesis (acceleration in gonadal development), and direct development (acceleration in somatic development, resulting in lack of larval or tadpole stages). A lot of species showing neoteny are known in urodeles, but not in anurans. Neotenic urodeles are also divided into three categories; permanent or obligate, "inducible" obligate, and facultative neotenies. Hynobius retardatus, a specific population of which had been reported to show neoteny but is believed to be extinct at present, has become to be used for experimental analysis of heterochronic expression of several adult characters during its ontogeny. Gonadal maturation and a transition of globin subunits from larval to adult types have been shown to occur independently on the morphological metamorphosis in H. retardatus. Mechanisms underlying the heterochrony, including morphogenetic clock, heterochronic genes in Drosophila and C. elegans, temporal colinearity in Hox gene complex in mice, and atavistic transformation induced by altered expression of Hox genes are discussed in terms of current molecular biology.
- 社団法人日本動物学会の論文
- 1996-12-15
著者
関連論文
- DIFFERENTIATED REACTION NORMS UNDER DIFFERENT SELECTIONS IN POLYMORPHISM: BROAD-HEADED MORPH IN HYNOBIUS RETARDATUS(Behavior Biology and Ecology)(Proceedings of the Seventy-Third Annual Meeting of the Zoological Society of Japan)
- Erythropoiesis and Conversion of RBCs and Hemoglobins from Larval to Adult Type during Amphibian Development
- TEMPERATURE-DEPENDENT SEX DIFFERENTIATION IN HYNOBIUS RETARDATUS : EXPRESSION PATTERN OF P450-AROMATASE(Endocrinology,Abstracts of papers presented at the 75^ Annual Meeting of the Zoological Society of Japan)
- PHYLOGEOGRAPHY OF THE SALAMANDER HYNOBIUS RETARDATUS BASED ON PARTIAL mtDNA SEQUENCE(Behavior Biology and Ecology,Abstracts of papers presented at the 76^ Annual Meeting of the Zoological Society of Japan)
- Several Biochemical Alterations from Larval to Adult Types are Independent on Morphological Metamorphosis in a Salamander, Hynobius retardatus
- DEVELOPMENT OF PRIMORDIAL GERM CELLS (PGCS) IN THE JAPANESE NEWT CYNOPS PYRRHOGASTER(Developmental Biology,Abstracts of papers presented at the 74^ Annual Meeting of the Zoological Society of Japan)
- EXPRESSION ANALYSIS OF A GENE EXPRESSED IN THE GERM LINE IN URODELE EMBRYOS(Developmental Biology,Abstracts of papers presented at the 75^ Annual Meeting of the Zoological Society of Japan)
- Adaptable Larval Life Histories in Different Populations of the Salamander, Hynobius retardatus, Living in Various Habitats(Animal Diversity and Evolution)
- Variation in Cannibalistic Polyphenism between Populations in the Salamander Hynobius retardatus(Ecology)
- Heterochronic Expression of Several Adult Phenotypes in Normally Metamorphosing and Metamorphosis-Arrested Larvae of a Salamander Hynobius retardatus
- Heterochrony and Neotenic Salamanders : Possible Clues for Understanding the Animal Development and Evolution
- HETEROCHRONIC EXPRESSION OF SEVERAL ADULT PHENOTYPES DURING METAMORPHOSIS OF A SALAMANDER HYNOBLUS RETARDATUS