GATA REPEATS IN THE GENOME OF ASELLUS-AQUATICUS (CRUSTACEA, ISOPODA)

被引:14
作者
PELLICCIA, F [1 ]
DICASTRO, M [1 ]
LANZA, V [1 ]
VOLPI, EV [1 ]
ROCCHI, A [1 ]
机构
[1] UNIV ROME LA SAPIENZA,DIPARTIMENTO GENET & BIOL MOLEC,CNR,CTR GENET EVOLUT,I-00185 ROME,ITALY
关键词
D O I
10.1007/BF00337243
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A 500 bp fragment of Drosophila genomic DNA containing 37 copies of the tetranucleotide GATA was used to probe, by Southern DNA blotting and in situ hybridization, two natural populations of the isopod crustacean Asellus aquaticus collected from the Sarno and Tiber rivers. This species does not have a recognizable sex chromosome pair. In a number of males from the Sarno population chromomycin A3 staining reveals a heteromorphic chromosome pair. The heterochromosome has two blocks of heterochromatin. After digestion of genomic DNA with six restriction endonucleases and hybridization with the GATA probe, the two populations exhibit different fragment length patterns. No sex-linked pattern was observed in either population. In situ hybridization to chromosomes of males and females from the Sarno population does not reveal any sex-specific pattern of labelling and indicates a scattered distribution of GATA sequences on most chromosomes with some areas of preferential concentration. The heterochromatic areas of the male heterochromosome are not labelled.
引用
收藏
页码:152 / 155
页数:4
相关论文
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