INTROGRESSION AND FIXATION OF ARCTIC CHAR (SALVELINUS-ALPINUS) MITOCHONDRIAL GENOME IN AN ALLOPATRIC POPULATION OF BROOK TROUT (SALVELINUS-FONTINALIS)
INTROGRESSION AND FIXATION OF ARCTIC CHAR (SALVELINUS-ALPINUS) MITOCHONDRIAL GENOME IN AN ALLOPATRIC POPULATION OF BROOK TROUT (SALVELINUS-FONTINALIS)
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DOI：
10.1139/f95-018
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发表时间：
1995-01-01
影响因子：
2.4
通讯作者：
DANZMANN, RG
中科院分区：
文献类型：
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作者：
BERNATCHEZ, L;GLEMET, H;DANZMANN, RG
虽然分类群之间的线粒体渐渗已经越来越多地记录，种间mtDNA的替换是罕见的，特别是当供体物种是缺席的。我们的文件证据表明，一个人口的溪红点鲑（Salvelinus fontinalis），其中所有个人拥有线粒体基因组的北极红点鲑（S。alpinus），尽管目前缺乏后者的物种在人口所在的分水岭。从阿兰湖（魁北克）的48溪鳟的线粒体基因型的特点进行了RFLP分析的整个mtDNA分子和/或2.5 kb的PCR扩增片段的ND-5/6区域。虽然检查的鱼形态上无法区分从典型的溪鳟和纯合子的诊断等位基因特征的溪鳟，所有个人的mtDNA是相同的魁北克北极红点鲑单倍型。总之，这些结果表明，在阿兰湖溪鳟观察到的mtDNA单倍型已导致古代渐渗与北极红点鲑，而不是祖先的多态性或趋同进化。他们还表明，这两个物种之间的渐渗杂交可能对其遗传组成产生重大和长期的影响。
Although mitochondrial introgression between taxa has been increasingly documented, interspecific replacement of mtDNA is rare, particularly when the donor species is absent. We document evidence for a population of brook trout (Salvelinus fontinalis) in which all individuals possess the mitochondrial genome of Arctic char (S. alpinus) despite the present-day absence of the latter species in the watershed where the population is located. The mitochondrial genotype of 48 brook trout from Lake Alain (Quebec) was characterized by RFLP analysis performed over the entire mtDNA molecule and/or a 2.5-kb PCR-amplified segment of the ND-5/6 region. Although the fish examined were morphologically indistinguishable from typical brook trout and homozygous for the diagnostic alleles characteristic of brook trout, the mtDNA of all individuals was identical to the Quebec Arctic char haplotype. Together, these results indicate that the mtDNA haplotype observed in Lake Alain brook trout has resulted from ancient introgression with Arctic char rather than ancestral polymorphism or convergent evolution. They also demonstrate that introgressive hybridization between those two species can have significant and long-term effects on their genetic composition.