Analysis of drosophila species genome size and satellite DNA content reveals significant differences among strains as well as between species

被引:146
作者
Bosco, Giovanni
Campbell, Paula
Leiva-Neto, Joao T.
Markow, Therese A.
机构
[1] Univ Arizona, Dept Mol & Cellular Biol, Tucson, AZ 85721 USA
[2] Univ Arizona, Dept Plant Sci, Tucson, AZ 85721 USA
[3] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA
关键词
ELECTRIC LINEAR DICHROISM; FOLLICLE CELLS; REPLICATION CONTROL; GENE AMPLIFICATION; X-CHROMOSOME; HETEROCHROMATIN; SEQUENCE; MELANOGASTER; BINDING; UNDERREPLICATION;
D O I
10.1534/genetics.107.075069
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
The size of eukaryotic genomes can vary by several orders of magnitude, yet genome size does not correlate with the number of genes nor with the size or complexity of the organism. Although "whole"-genome sequences, such as those now available for 12 Drosophila species, provide information about euchromatic DNA content, they cannot give an accurate estimate of genome sizes that include heterochromatin or repetitive DNA content. Moreover, genome sequences typically represent only one strain or isolate of a single species that does not reflect intraspecies variation. To more accurately estimate whole-genome DNA content and compare these estimates to newly assembled genomes, we used flow cytometry to measure the 2C genome values, relative to Drosophila melanogaster We estimated genome sizes for the 12 sequenced Drosophila species as well as 91 different strains of 38 species of Drosophilidae. Significant differences in intra- and interspecific 2C genome values exist within the Drosophilidae. Furthermore, by measuring polyploid 16C ovarian follicle cell underreplication we estimated the amount of satellite DNA in each of these species. We found a strong correlation between genome size and amount of satellite underreplication. Addition and loss of heterochromatin satellite repeat elements appear to have made major contributions to the large differences in genome size observed in the Drosophilidae.
引用
收藏
页码:1277 / 1290
页数:14
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