Chromosomal rearrangement in Pectinidae revealed by rRNA loci and implications for bivalve evolution

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	Chromosomal rearrangement in Pectinidae revealed by rRNA loci and implications for bivalve evolution
	Wang, YP ; Guo, XM
	2004-12-01
发表期刊	BIOLOGICAL BULLETIN
ISSN	0006-3185
卷号	207 期号:3 页码:247-256
文章类型	Article
摘要	Karyotype and chromosomal localization of major (18-5.8-28S) and minor (5S) ribosomal RNA genes were studied in two species of Pectinidae, zhikong (Chlamys farreri) and bay (Argopecten irradians irradians) scallops. using fluorescence in situ hybridization (FISH). C. farreri had a haploid number of 19 with a karyotype of 3m + 4sm + 7sm-st + 4st + 1st-t, and A. i. irradians had a haploid number of 16 with a karyotype of 5st + 11t. In C. farreri, the major and minor rRNA genes had one locus each and were mapped to the same chromosome-Chromosome 5. In A. i. irradians, the major rRNA genes had two loci, located on Chromosomes 4 and 8, and the 5S rRNA gene was found at a third chromosome-Chromosome 10. Results of this and other studies indicate that karyotype of A. i. irradians (n = 16, 21 arms) is secondary and derived from an ancestral karyotype similar to that of C. farreri (n = 19, 38 arms) through considerable chromosomal loss and rearrangements. The ability to tolerate significant chromosomal loss suggests that the modal karyotype of Pectinidae and possibly other bivalves with a haploid number of 19 is likely tetraploid; i.e., at least one genome duplication has occurred during the evolution of Bivalvia.; Karyotype and chromosomal localization of major (18-5.8-28S) and minor (5S) ribosomal RNA genes were studied in two species of Pectinidae, zhikong (Chlamys farreri) and bay (Argopecten irradians irradians) scallops. using fluorescence in situ hybridization (FISH). C. farreri had a haploid number of 19 with a karyotype of 3m + 4sm + 7sm-st + 4st + 1st-t, and A. i. irradians had a haploid number of 16 with a karyotype of 5st + 11t. In C. farreri, the major and minor rRNA genes had one locus each and were mapped to the same chromosome-Chromosome 5. In A. i. irradians, the major rRNA genes had two loci, located on Chromosomes 4 and 8, and the 5S rRNA gene was found at a third chromosome-Chromosome 10. Results of this and other studies indicate that karyotype of A. i. irradians (n = 16, 21 arms) is secondary and derived from an ancestral karyotype similar to that of C. farreri (n = 19, 38 arms) through considerable chromosomal loss and rearrangements. The ability to tolerate significant chromosomal loss suggests that the modal karyotype of Pectinidae and possibly other bivalves with a haploid number of 19 is likely tetraploid; i.e., at least one genome duplication has occurred during the evolution of Bivalvia.
关键词	Crassostrea-gigas Thunberg In-situ Hybridization Pacific Oyster Molecular Phylogeny Cytochalasin-b 5s Rdna Genes Dna Mollusks Sequence
学科领域	Biology ; Marine & Freshwater Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000226248400010
引用统计	被引频次：75[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/3570
专题	海洋生物技术研发中心
作者单位	1.Rutgers State Univ, Haskin Shellfish Res Lab, Inst Marine & Coastal Sci, Port Norris, NJ 08349 USA 2.Chinese Acad Sci, Expt Marine Biol Lab, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Wang, YP,Guo, XM. Chromosomal rearrangement in Pectinidae revealed by rRNA loci and implications for bivalve evolution[J]. BIOLOGICAL BULLETIN,2004,207(3):247-256.
APA	Wang, YP,&Guo, XM.(2004).Chromosomal rearrangement in Pectinidae revealed by rRNA loci and implications for bivalve evolution.BIOLOGICAL BULLETIN,207(3),247-256.
MLA	Wang, YP,et al."Chromosomal rearrangement in Pectinidae revealed by rRNA loci and implications for bivalve evolution".BIOLOGICAL BULLETIN 207.3(2004):247-256.

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