(TTAGGG)n telomeric sequence in selachian chromosomes

被引：21

作者：

Rocco, L ^{[1
]}

Costagliola, D ^{[1
]}

Stingo, V ^{[1
]}

机构：

[1] Univ Naples 2, Dipartimento Sci Vita, I-81100 Caserta, Italy

来源：

HEREDITY | 2001年 / 87卷 / 5期

关键词：

Chondrichthian evolution; FISH; telomere; repeated DNA;

D O I：

10.1046/j.1365-2540.2001.00945.x

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

The distribution of telomeric sequence (TTAGGG)(n) in the genomes of Chondrichthian species at different stages of evolution was investigated both by DNA genomic hybridization, and by fluorescence in-situ hybridization (FISH) of metaphase chromosomes. The sequence is highly conserved in all the species examined. FISH revealed a label uptake only by the telomeres in Raja asterias. However, in Torpedo ocellata, we revealed pericentromeric and interstitial sequence localization on some chromosome pairs in addition to the hybridization signal on telomeres. These findings confirm that the karyotype evolution of these fish began by Robertsonian fusion.

引用

页码：583 / 588

页数：6

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