Characterization of a cosmid library from flow-sorted chromosomes 11

Area of Science:

• Genomics
• Molecular Biology
• Human Genetics

Background:

• Construction of comprehensive genomic libraries is crucial for gene mapping and understanding chromosome structure.
• Human chromosome 11 harbors genes associated with various genetic disorders, necessitating detailed molecular characterization.

Purpose of the Study:

• To construct a high-quality cosmid library specific to human chromosome 11.
• To provide a valuable resource for molecular genetic studies of chromosome 11.
• To assess the library's utility for gene mapping and positional cloning.

Main Methods:

• Flow-sorting of human chromosome 11 from a hamster/human hybrid cell line (J1).
• Cloning of flow-purified DNA into a cosmid vector.
• Arraying of clones into microtitre plates and high-density filters.
• Hybridization analysis to determine human and hamster DNA content.

Main Results:

• A library of 17,952 clones was generated, with 83.7% human DNA and an average insert size of 33.6 kb.
• The library represents approximately 3.5 equivalents of chromosome 11, totaling 494,487 kb of cloned human DNA.
• Minimal insert rearrangement (2.4%) was observed, indicating library integrity.
• Demonstrated utility for identifying polymorphic markers, telomeric clones, and facilitating chromosome walking.

Conclusions:

• The constructed cosmid library is a high-quality, comprehensive resource for human chromosome 11 research.
• The library significantly advances the molecular genetic analysis and mapping of chromosome 11.
• This resource will accelerate gene discovery and the study of chromosome 11-related diseases.