Multiregional origin of B chromosomes in the grasshopper Eyprepocnemis plorans
Multiregional origin of B chromosomes in the grasshopper Eyprepocnemis plorans
复制标题
DOI：
10.1007/s00412-003-0264-2
复制
发表时间：
2003-12-01
期刊：
影响因子：
1.6
通讯作者：
Camacho, JPM
中科院分区：
文献类型：
--
作者：
Cabrero, J;Bakkali, M;Camacho, JPM
利用18 S-5.8S-28 S rDNA、5S rDNA和180 bp satDNA 3个分子标记进行染色体定位分析，结果表明，Eypropocnemis plorans的B染色体分别起源于东部（高加索）和西部（西班牙和摩洛哥）种群。东方B染色体最有可能来源于最小的常染色体，这是携带三个标记的唯一A染色体，与高加索人B染色体一致。然而，Western B染色体缺乏5S rDNA，并且最有可能来自X染色体，X染色体是携带两个剩余标记的唯一A染色体，关于着丝粒总是以与B染色体相同的顺序。
Analysis of chromosome localization of three molecular markers, 18S-5.8S-28S rDNA, 5S rDNA and a 180 bp satDNA, showed that B chromosomes in the grasshopper Eyprepocnemis plorans originated independently in Eastern (Caucasus) and Western (Spain and Morocco) populations. Eastern B chromosomes are most likely derived from the smallest autosome, which is the only A chromosome carrying the three markers, in coincidence with Caucasian B chromosomes. Western B chromosomes, however, lack 5S rDNA and are most likely derived from the X chromosome, which is the only A chromosome carrying the two remaining markers, always in the same order with respect to the centromere, as the B chromosome.