MOMTAZ, O., IBRAHIM, A., KAMEL, I., MADKOUR, M. (1999). CONSTRUCTION AND CHARACTERIZATION OF BACTERIAL ARTIFICIAL CHROMOSOME LIBRARY OF EGYPTIAN COTTON (GOSSYPIUM BARBADENSE L.). test, 77(4), 1769-1787. doi: 10.21608/ejar.1999.342458
OSAMA A. MOMTAZ; ABEER A. IBRAHIM; ISMAIL A. KAMEL; MAGDY A. MADKOUR. "CONSTRUCTION AND CHARACTERIZATION OF BACTERIAL ARTIFICIAL CHROMOSOME LIBRARY OF EGYPTIAN COTTON (GOSSYPIUM BARBADENSE L.)". test, 77, 4, 1999, 1769-1787. doi: 10.21608/ejar.1999.342458
MOMTAZ, O., IBRAHIM, A., KAMEL, I., MADKOUR, M. (1999). 'CONSTRUCTION AND CHARACTERIZATION OF BACTERIAL ARTIFICIAL CHROMOSOME LIBRARY OF EGYPTIAN COTTON (GOSSYPIUM BARBADENSE L.)', test, 77(4), pp. 1769-1787. doi: 10.21608/ejar.1999.342458
MOMTAZ, O., IBRAHIM, A., KAMEL, I., MADKOUR, M. CONSTRUCTION AND CHARACTERIZATION OF BACTERIAL ARTIFICIAL CHROMOSOME LIBRARY OF EGYPTIAN COTTON (GOSSYPIUM BARBADENSE L.). test, 1999; 77(4): 1769-1787. doi: 10.21608/ejar.1999.342458

CONSTRUCTION AND CHARACTERIZATION OF BACTERIAL ARTIFICIAL CHROMOSOME LIBRARY OF EGYPTIAN COTTON (GOSSYPIUM BARBADENSE L.)

Egyptian Journal of Agricultural Research
Article 29, Volume 77, Issue 4, December 1999, Pages 1769-1787    PDF (5.24 M)
Document Type: Original Article
DOI: 10.21608/ejar.1999.342458
Authors
OSAMA A. MOMTAZ1; ABEER A. IBRAHIM1; ISMAIL A. KAMEL2; MAGDY A. MADKOUR2
1Agricultural Genetic Engineering Research Institute, Agricultural Research Center, Giza, Egypt
2Department of Botany, Faculty of Science, Cairo University, Giza, Egypt
Abstract
BAC library for the Egyptian cotton Gossypiurn barbadense. Giza 70, Giza 86, and Giza 75 varieties have been constructed and character­ized. The isolation and purification of high molecular weight DNA from nuclei embedded in agarose microbeads was an essential part of this work. Several experimental parameters were investigated including op­timization of megabase-size DNA restriction enzyme digest and CHEF gel conditions to achieve the highest resolution and separation of such DNA. Fragments ranging in size from 200Kb to 500Kb were size selected and recovered from agarose gel to be used in BAC library construction. The BAC vector, pBeIoBAC li derived from the endogenous E.coli F-factor plasmid was used in library construction. Different insert: vector ligation ratios examined indicated 15:1 insert:vector to be the optimum ligation ratio. The maximum construct-host transformation efficiency calculated at 1.8 KV electroporation voltage. Purification and isolation of BAC clones were followed by restriction enzyme digest using Notl to charac­terize insert sizes. Characterization of insert sizes and integrity was achieved by using CHEF gel electrophoresis conditions at 6V/cm, 5 and 1 5 sec initial and final swich times respectively, and 12°C temperature for 12 hrs. BAC libraries for Giza 70, Giza 86, and Giza 75 varieties con­tained 45,237; 45,742; and 46,531 clones respectively with an average insert size of 100 Kb. Considering the haploid genome size for cotton to be 2,118 Mb, BAC libraries contains 2.12 haploid genome equivalent. Egyptian cotton BAC library constructed for Gossypium barbadense Giza 70, Giza 86, and Giza 75 varieties provide 88% probability of isolating a specific genomic region and are optimized for future gene identification, isolation, target gene mapping, and chromosome walking.
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