Institute for Molecular Biosciences, Biocentre, Goethe-University, Senckenberganlage 31, 60325 Frankfurt am Main, Germany.
Biochem Soc Trans. 2013 Feb 1;41(1):339-43. doi: 10.1042/BST20120315.
Several species of haloarchaea have been shown to be polyploid and thus this trait might be typical for and widespread in haloarchaea. In the present paper, nine different possible evolutionary advantages of polyploidy for haloarchaea are discussed, including low mutation rate, radiation/desiccation resistance, gene redundancy and survival over geological times and at extraterrestrial sites. Experimental indications exist for all but one of these evolutionary advantages. Several of the advantages require gene conversion, which has been shown to be present and active in haloarchaea.
几种盐杆菌已被证明是多倍体，因此这种特征可能是盐杆菌的典型特征，并且在盐杆菌中广泛存在。在本文中，讨论了多倍体对盐杆菌的九个可能的进化优势，包括低突变率、辐射/干燥抗性、基因冗余以及在地质时期和外星场所的生存能力。除了一个进化优势外，其他所有优势都有实验依据。其中几个优势需要基因转换，而盐杆菌中已经证明存在并活跃着基因转换。
