Evidence for nucleomorph to host nucleus gene transfer: Light-harvesting complex proteins from cryptomonads and chlorarachniophytes
Evidence for nucleomorph to host nucleus gene transfer: Light-harvesting complex proteins from cryptomonads and chlorarachniophytes
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DOI：
10.1078/1434-4610-00022
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发表时间：
2000-10-01
期刊：
影响因子：
2.5
通讯作者：
McFadden, GI
中科院分区：
文献类型：
--
作者：
Deane, JA;Fraunholz, M;McFadden, GI
隐藻和绿藻通过吞噬和保留真核藻类细胞独立地获得光合作用。被吞噬的细胞的核（称为核态）被大大减少，并且仅编码通常由含叶绿体的生物体的核编码的众多必需质体蛋白中的少数。在隐藻和绿藻中，这些蛋白质被认为是由次级宿主细胞核中的基因编码的，这些蛋白质的基因可能从核型（共生体细胞核）转移到次级宿主细胞核;核到核的细胞内基因转移。在每种生物中，这些基因位于次级宿主细胞核中，但系统发育证据和靶向机制的分析表明，这些基因最初位于各自的核型（共生体细胞核）中，讨论了次级内共生藻类起源的意义。
Cryptomonads and chlorarachniophytes acquired photosynthesis independently by engulfing and retaining eukaryotic algal cells. The nucleus of the engulfed cells (known as a nucleomorph) is much reduced and encodes only a handful of the numerous essential plastid proteins normally encoded by the nucleus of chloroplast-containing organisms. In cryptomonads and chlorarachniophytes these proteins are thought to be encoded by genes in the secondary host nucleus, Genes for these proteins were potentially transferred from the nucleomorph (symbiont nucleus) to the secondary host nucleus; nucleus to nucleus intracellular gene transfers, We isolated complementary DNA clones (cDNAs) for chlorophyll-binding proteins from a cryptomonad and a chlorarachniophyte. In each organism these genes reside in the secondary host nuclei, but phylogenetic evidence, and analysis of the targeting mechanisms, suggest the genes were initially in the respective nucleomorphs (symbiont nuclei), Implications for origins of secondary endosymbiotic algae are discussed.