A BAC library provides long-term efficacy in genome analysis. Its versatility of use, such as map-based cloning, physical mapping or sequencing, facilitates multi-faceted projects. However, the construction of a BAC library is great and undertaking if it only aims to know one or even a few genomic regions.

In order to reduce costs and improve access to genomic regions of interest, the CNRGV has developed a targeted genomic library strategy. BAC clones of targeted genomic libraries are organized in pools containing around 1000 to 3000 events and screened immediately after their transformation. Thus allows for the isolation of clones of interest, while avoiding the expensive and time-consuming step of organizing BAC clones in microplates.

The CNRGV offers the possibility to construct a targeted BAC library from a genotype of interest, starting with a 1 or 2 x genome coverage (with mean inserts size around 110kb). The pools are then screened using specific markers of the region of interest, using real-time PCR. The BAC clones carrying the markers are then individualized and can be sequenced using Next Generation DNA Sequencing technology (pool of BACs with Pacific Biosciences technology).

Targeted genomic libraries have proven efficacy and are notably useful in investigating the diversity of specific regions among various plant cultivars.