A HindIII BAC library construction of Mesobuthus martensii Karsch (Scorpiones:Buthidae): an important genetic resource for comparative genomics and phylogenetic analysis.
Genes Genet Syst
; 84(6): 417-24, 2009 Dec.
Article
en En
| MEDLINE
| ID: mdl-20228579
ABSTRACT
Scorpions are "living but sophisticated fossils" that have changed little in their morphology since their first appearance over the past 450 million years ago. To provide a genetic resource for understanding the evolution of scorpion genome and the relationships between scorpions and other organisms, we first determined the genome size of the scorpion Mesobuthus martensii Karsch (about 600 Mbp) in the order Scorpiones and constructed a HindIII BAC library of the male scorpion M. martensii Karsch from China. The BAC library consists of a total of 46,080 clones with an average insert size of 100 kb, providing a 7.7-fold coverage of the scorpion haploid genome size of 600 Mbp as revealed in this study. High-density colony hybridization-based library screening was performed using 18S-5.8S-28S rRNA gene that is one of the most commonly used phylogenetic markers. Both library screening and PCR identification results revealed six positive BAC clones which were overlapped, and formed a contig of approximately 120 kb covering the rDNA. BAC DNA sequencing analysis determined the complete sequence of M. martensii Karsch rDNA unit that has a total length of 8779 bp, including 1813 bp 18s rDNA, 157 bp 5.8s rDNA, 3823 bp 28s rDNA, 530 bp ETS, 2168 bp ITS1 and 288 bp ITS2. Interestingly, some tandem repeats are present in the rRNA intergenic sequence (IGS) and ITS1/2 regions. These results demonstrated that the BAC library of the scorpion M. martensii Karsch and the complete sequence of rDNA unit will provide important genetic resources and tools for comparative genomics and phylogenetic analysis.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Escorpiones
/
Desoxirribonucleasa HindIII
/
Biblioteca Genómica
/
Cromosomas Artificiales Bacterianos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Genes Genet Syst
Asunto de la revista:
BIOLOGIA MOLECULAR
/
BIOTECNOLOGIA
Año:
2009
Tipo del documento:
Article