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題 名 | Origin and Molecular Evolution of the X-Linked Duplicate Color Vision Genes in Howler Monkeys=吼猴性染色體上複製色覺基因之來源及分子演化 |
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作 者 | 周一紅; 裘莉; 李文雄; | 書刊名 | 動物研究學刊 |
卷 期 | 36:4 1997.10[民86.10] |
頁 次 | 頁360-369 |
分類號 | 383.4 |
關鍵詞 | 吼猴; 色覺基因; 基因複製; 核酸序列; 古老的多樣性; Trichromacy; Color pigment; New world monkeys; Ancient polymorphism; |
語 文 | 英文(English) |
中文摘要 | 吼猴(howler monkey)為新世界猴子之一屬。跟人類及舊世界猴子一樣,吼猴可以辨別三種顏色,因為牠們擁有一個體染色體上(藍色素蛋白質)和兩個性染色體上(紅和綠色素蛋白質)的色覺基因。但是,其它已經詳細研究過的新世界猴子都只有一個體染色體上和一個性染色體上的色覺基因,只是牠們性染色體上色覺基因座上有三個對偶子(alleles)。為瞭解吼猴三色覺基因的來源,我們研究了數種新世界猴子性染色體上色覺基因的數目,並將一雄性吼猴的intron 4和exons 3,4和5的核酸序列定序出來。利用SSCP及Southern blotting的技巧,我們證明了spider monkey,woolly monkey,saki monkey和beared saki monkey的性染色體上只有一個色覺基因。因此我們可以說,在新世界猴子中,只有吼猴擁有二個性染色體上的色覺基因。Exons 3,4和5及intron 4的核酸序列顯示吼猴性染色體上的兩個複製基因的來源與人類及舊世界猴子性染色體上的兩個基因的來源不同。其次,由胺基酸的序列可看出吼猴的兩個複製基因是分別由一個紅色素及一個綠色素同位子合併而來。這兩個同位子很類似現今存於squirrel monkey和capuchin中的紅色素及綠色素同位子。此外,吼猴的兩個基因的intron 4的核酸序列又顯示出晚近的gene conversion現象,以致這兩個intron 4變為很相似,這又進一步證明gene conversion的現象常發生於性染色體上的色覺基因之間。 |
英文摘要 | Like humans and Old World monkeys (OWMs), the howler monkeys, a genus of New World monkeys (NWMs), have trichromatic vision because they possess 1 autosomal (blue pigment) and 2 X-linked (red and green pigments) color vision genes. In contrast, the other NWM species investigated in detail have only 1 autosomal and 1 X-linked color vision gene, though the X-linked locus is polymorphic with 3 alleles. To understand the origin of trichromacy in howler monkeys, several NWM species were examined for the number of X-linked pigment loci, and intron 4, and exons 3, 4, and 5 of the red and green pigment genes of a male howler monkey were sequenced. The spider monkey, the woolly monkey, the saki monkey, and the bearded saki monkey were shown by the technique of single strand conformational polymorphism (SSCP) and by Southern blotting to have only 1 X-linked color vision gene, suggesting that within NWMs, the howler monkeys are the only genus with 2 X-linked pigment loci. The sequences of exons 3,4 and 5 and intron 4 reveal that the gene duplication in the howler monkey was independent of that in the human-ape-OWM lineage. In addition, the amino acids at 4 critical sites for spectral tuning suggest that the duplication in the common ancestor of howler monkeys was derived from the incorporation of 2 lleles that were, respectively, very similar to the P535 (green) and P562 (red) pigment alleles currently existing in the squirrel monkey and capuchin (2 NWM genera). This hypothesis implies that the P535-P562 polymorphism existed before the platyrrhini (NWM) radiation, which took place about 20 million years ago. Furthermore, the distribution of sequence differences in intron 4 between the 2 howler monkey genes suggests that the 2 intron 4 sequences have been homogenized by recent gene conversion events, providing further evidence for the frequent occurrence of gene conversion between X-linked pigment genes. |
本系統中英文摘要資訊取自各篇刊載內容。