尼罗鳄线粒体基因组全序列分析及鳄类系统发生关系的探讨

大多数脊椎动物的线粒体基因组（约16—18kb）的组成是相对较稳定的，但在不同类群中，线粒体基因组在基因结构和基因排列方式等方面均显示了极大的多样性，这种多样性可能反映了真核细胞不同的进化路线（Saccone et al．，1999）。就目前的研究而言，线粒体基因组是惟一一个能够从基因组水平上来分析动物系统发生的分子标记，可以从线粒体基因组序列信息、基因组成及基因排列方式等进行多方位的分子进化研究，因而线粒体基因组全序列将成为动物分子系统发生最有力的证据（Saccone et al．，1999）。

The mitochondrial genome of Crocodylus niloticus with implications for phylogenetic relationships among crocodilian species

The 16 776 bp mitochondrial DNA (mtDNA) of Crocodylus niloticus was sequenced by PCR methods. Comparing with the complete nucleotide sequences of the mitochondrial genome of other crocodiles, no variation on gene arrangement or quantity was found in the mtDNA of Crocodylus niloticus, however, the control region varied greatly. In addition to the analyses of complete sequences, partial sequences of 12S rRNA, 16S rRNA and Cyt b gene from other 13 crocodile species were combined and analyzed. We attempted to diagram phylogenetic relationships among crocodile species to provide convenience for following research.