首页 | 本学科首页   官方微博 | 高级检索  
   检索      


5S ribosomal and U1 small nuclear RNA genes: a new linkage type in the genome of a crustacean that has three different tandemly repeated units containing 5S ribosomal DNA sequences.
Authors:F Pelliccia  R Barzotti  E Bucciarelli  A Rocchi
Institution:Dipartimento di Genetica e Biologia Molecolare, Università La Sapienza, Roma, Italia.
Abstract:We investigated the 5S ribosomal RNA (rRNA) genes of the isopod crustacean Asellus aquaticus. Using PCR amplification, three different tandemly repeated units containing 5S rDNA were identified. Two of the three sequences were cloned and sequenced. One of them was 1842 bp and presented a 5S rRNA gene and a U1 small nuclear RNA (snRNA) gene. This type of linkage had never been observed before. The other repeat consisted of 477 bp and contained only an incomplete 5S rRNA gene lacking the first eight nucleotides and a spacer sequence. The third sequence was 6553 bp long and contained a 5S rRNA gene and the four core histone genes. The PCR products were used as probes in fluorescent in situ hybridization (FISH) experiments to locate them on chromosomes of A. aquaticus. The possible evolutionary origin of the three repeated units is discussed.
Keywords:
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号