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Home >> Plant Biotechnology and Genomics >>Construction of Molecular Maps and Synteny (Collinearity) >>Genome-wide Physical Maps using Large Insert YACs,BACs and BIBACs

Genome-wide physical maps using large-insert YACs, BACs and BIBACs
In all plants and animals, in order to facilitite genomics research, genome-wide physical maps are now being prepared using large-inserts in YAC, BAC and BIBAC vectors. These maps provide essential platforms for a variety of activities including the following: (i) large scale genome-sequencing, (ii) effective positional cloning, (iii) high throughput physical mapping of ESTs and (iv) target DNA-marker development. Several approaches that are available for the development of these large-insert physical maps include the following: (i) hybridization- based methods using interative hybridizations

(ii) restriction-based fingerprinting methods and (iii) methods for development of integrated maps involving BAC end sequencing, fingerprinting and whole-genome sequencing. Of these three methods, the hybridization method suffers with the problem of the occurrence of repeat sequences, while integrated-map approach, based on sequencing and fingerprinting, is expensive. Therefore, the method of choice during the year 2001 has been the restriction-based fingerprinting. In this restriction fingerprinting approach, the restricted fragments are end labelled and fractionated on agarose or denaturing polyacrylamide gels. During 2001, automatic sequencers were also used for electrophoresis-based fingerprinting, leading to the preparation of large-insert BAC-based physical maps in an indica rice

 

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