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1
題名:Heterochromatin Accumulation and Karyotypic Evolution in Some Dipteran Insects    
異染色質之累積與一些雙翅目昆蟲之細胞核型之進化
著者:Visut Baimai
出版地區:台灣
出版城市:台北市
學科:生命科學 ; 醫學綜合
關鍵字:結構異染色質 ; 有絲分裂染色體 ; 核型的進化 ; 雙翅目昆蟲 ; 細胞分類學 ; Constitutive heterochromatin ; Mitotic chromosomes ; Karyotypic evolution ; Dipteran insects ; Cytotaxonomy.
刊名:Zoological Studies 
頁碼:75-88
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

真核細胞的生物之分歧進化包括染色體組之各個不同層次的遺傳改變。在染色體的層次上,異染色質的分化導致核型的改變提供了許多動物包括雙翅目的昆蟲一個非常有用的細胞分類學的工具。本文介紹果蠅屬(果蠅科)、瘧蚊屬(蚊科)及果實蠅屬(果實蠅科)昆蟲其親緣關係很近的種或同胞種之異染色質的量的改變與異染色質在染色體上的分布來探討其分歧進化,如雙翅目昆蟲果蠅屬之montium種亞群之吉川氏果蠅(D. kikkawai)種族、瘧蚊屬之maculatus(斑腳瘧蚊)種群之惡兆瘧蚊(Anopheles dirus)種族及果實蠅屬之東方果實蠅(Bactrocera dorsalis)種族及雙果實蠅(Zeugodacus)種群。 本研究的結果顯示在有絲分裂中期的染色體不管種間或種內的差異在主要部分之性染色體或體染色體的結構異染色質之增得,尤其是在染色體的臂間部分(pericentric region)。再者,有絲分裂中期異染色質之量的改變,可以很成功的做為遺傳標記來細分蔭蔽種(cryptic species)或型態相近的物種。雖然異染色質在物種的分化上所扮演的色角至今未明,但是異染色質在染色體組(genome)上的累積明顯的與雙翅目昆蟲其遺傳上的分化及染色體的進化有關。
Evolutionary divergence among eukaryotes always involves genetic changes at different levels of the genome. At the chromosomal level, heterochromatin differentiation resulting in karyotypic evolution provides a useful tool for cytotaxonomy of many groups of animals including the dipteran insects. In our studies, detectable differences in the amount and distribution of heterochromatin have been observed in several groups of closely related species and some sibling species complexes of Drosophila, Anopheles, and Bactrocera, for example, the D. kikkawai complex and the montium subgroup, the An. dirus complex and the maculatus group, and the B. dorsalis complex and the Zeugodacus group, respectively. Most cases, if not all, of our studies point to the fact that inter- and intraspecific differences in mitotic chromosomes are due to the acquisition of major block (s) of constitutive heterochromatin in the sex chromosome (s) and/or autosome (s), particularly at the pericentric region. Further, quantitative differences in heterochromatin of mitotic chromosomes can be successfully employed as genetic markers for separation of cryptic or isomorphic species in these groups of insects. Although the functional role and implications of heterochromatin in species differentiation is an unsolved problem, heterochromatin accumulation in the genome is clearly involved in genetic differentiation and karyotypic evolution of dipteran insects as demonstrated in the present study.


    

本卷期目次
Zoological Studies 
Conversion of Cholesterol to Sex Steroid-like Substances by Tissues of Mictyris brevidactylus in Vitro/ Jin-Taur ShihChing-Fong Liao
Review of the Marine Gobiid Genus, Amblyeleotris (Pisces: Gobiidae) with Seven New Records from Taiwan/ Jeng-Ping ChenI-Shiung ChenKwang-Tsao Shao
Juvenoid Biosynthesis by Corpora Allata of Adult Female and Male Loreyi Leafworm, Mythimna loreyi Duponchel (Lepidoptera: Noctuidae)/ Rong KouMeng-Ping Tu
Purification and Characterization of Vitellin from the Freshwater Giant Prawn, Macrobrachium rosenbergii/ Ying-Nan ChenChing-Ming Kuo
Shallow-water Echinoderms of Taiping Island in the South China Sea/ Ming-Shiou Jeng
A New Species of the Genus Coprophilus Latreille, 1829 from the High Mountain Elevations in Taiwan, with Comments on Zonyptilus Motschulsky, 1845 (Coleoptera: Staphylinidae: Oxytelinae)/ Ale? Smetana
Heterochromatin Accumulation and Karyotypic Evolution in Some Dipteran Insects/ Visut Baimai
The Involvement of Calcium in Heat-induced Coral Bleaching/ Shiao-Ping HuangKu-Lin LinLee-Shing Fang
Morphology and Ultrastructure of the Alimentary Canal of Oriental Fruit Fly Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) (I): The Structure of the Foregut and Cardia/ Wen-Yung LeeMei-Er ChenTai-Lang Lin
 
   
 
   

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