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Characterization of a flow-sorted human chromosome 10 cosmid library by FISH
N S Ma1, C Zheng, Y Benchekroun
1Department of Human and Molecular Genetics, Genome Therapeutics Corporation, Waltham, USA.
Cytogenetics and Cell Genetics
|January 1, 1996
Summary
Fluorescence in situ hybridization mapped over 70% of randomly selected cosmids to unique regions of human chromosome 10. This study provides a foundational map for human chromosome 10 gene localization.
Area of Science:
- Genomics
- Molecular Biology
- Cytogenetics
Background:
- Cosmid libraries are essential for genome mapping.
- Accurate localization of DNA sequences is crucial for understanding chromosome structure and function.
Purpose of the Study:
- To physically map cosmids to specific regions of human chromosome 10.
- To assess the quality and composition of a chromosome 10-specific cosmid library.
Main Methods:
- Fluorescence in situ hybridization (FISH) was employed.
- A library of 301 random cosmids from a flow-sorted human chromosome 10 cosmid library was analyzed.
- Cosmids were arrayed in microtiter plates for systematic screening.
Main Results:
- Over 70% of cosmids (211/301) mapped to unique locations on human chromosome 10.
- Approximately 7% of cosmids (22/301) showed multiple hybridization signals, indicating potential chimeric clones or low-copy repeats.
- 19% of cosmids (59/301) contained significant hamster DNA inserts, and 1% (3/301) hybridized to centromeric regions of multiple chromosomes.
Conclusions:
- The study successfully localized a majority of cosmids to unique regions of chromosome 10, establishing a valuable resource for further genomic studies.
- The characterization identified a significant proportion of non-human DNA and potential repeat sequences, highlighting the importance of quality control in library construction.