Ren Jianfeng, Buchinger Tyler, Pu Jiafei, Jia Liang, Li Weiming
a College of Fisheries and Life Sciences , Shanghai Ocean University , Shanghai , P.R. China and.
b Department of Fisheries and Wildlife , Michigan State University , East Lansing , MI , USA.
Mitochondrial DNA A DNA Mapp Seq Anal. 2016 May;27(3):1862-3. doi: 10.3109/19401736.2014.971261. Epub 2014 Oct 16.
The complete mitogenomes of paired species northern brook lamprey (Ichthyomyzon fossor) and silver lamprey (I. unicuspis) is reported. The two mitogenomes show a 13 bp length difference on the tRNA-Gly and two control regions. The gene order and contents are conserved in the two lampreys and identical to the lamprey mitogenomes published. Except for three indel polymorphic sites, there are 27 SNP sites which are all synonymous substitution sites and occurred on 9 protein-coding genes, two rRNAs and one tRNA. The control region1 contains six consecutive 39-nt repetitive strings in both lampreys. A 7-nt repetitive string in the control region2 is repeated 3 and 5 times in northern brook lamprey and silver lamprey, respectively. The observed level of similarity between nucleotide sequences (99.74%) is consistent with the hypothesis that northern brook lamprey and silver lamprey represent two ecotypes of one species.
报道了成对物种北方溪七鳃鳗（Ichthyomyzon fossor）和银七鳃鳗（I. unicuspis）的完整线粒体基因组。这两个线粒体基因组在tRNA-甘氨酸和两个控制区上显示出13 bp的长度差异。这两种七鳃鳗的基因顺序和内容是保守的，并且与已发表的七鳃鳗线粒体基因组相同。除了三个插入缺失多态性位点外，还有27个单核苷酸多态性位点，这些位点均为同义替换位点，出现在9个蛋白质编码基因、两个核糖体RNA和一个转运RNA上。控制区1在两种七鳃鳗中都包含六个连续的39 nt重复序列。控制区2中的一个7 nt重复序列在北方溪七鳃鳗和银七鳃鳗中分别重复3次和5次。观察到的核苷酸序列相似性水平（99.74%）与北方溪七鳃鳗和银七鳃鳗代表一个物种的两个生态型这一假设一致。
