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Region-specific cosmids and STRPs identified by chromosome microdissection and FISH
W L Flejter1, P Bennett-Baker, C L Barcroft
1Department of Pediatrics, University of Michigan, Ann Arbor 48109, USA.
Genomics
|January 20, 1995
Summary
This study presents a novel strategy for identifying short tandem repeat (STR) markers in specific DNA regions. The method successfully isolated new polymorphic STRs from chromosome 17q12-q21, including the BRCA1 region.
Area of Science:
- Genomics
- Molecular Biology
- Genetic Marker Discovery
Background:
- Identifying specific DNA sequences like short tandem repeats (STRs) is crucial for genetic mapping and disease gene discovery.
- Chromosome microdissection combined with cosmid library screening offers a targeted approach to isolate regional genetic markers.
Purpose of the Study:
- To develop and validate a strategy for efficiently identifying STR-containing cosmid clones from specific chromosomal regions.
- To isolate novel polymorphic STR markers from the 17q12-q21 chromosomal region, which harbors the BRCA1 gene.
Main Methods:
- Utilized chromosome microdissection and PCR-amplified DNA as probes to screen a cosmid library.
- Employed dual hybridization screening with pooled STR sequences and characterized positive clones for polymorphisms.
- Applied fluorescence in situ hybridization (FISH) for precise mapping and designed primers for STR analysis.
Main Results:
- Successfully identified 38 cosmid clones from chromosome 17 using the dual screening procedure.
- Confirmed 19 cosmids originated from the targeted microdissected region (17q12-q21).
- Isolated 10 tetranucleotide repeats from 13 selected cosmids, identifying six polymorphic and one nonpolymorphic STR marker.
Conclusions:
- The described dual screening strategy is effective for isolating STR-containing cosmid clones from specific genomic regions.
- This approach facilitates the discovery of new polymorphic markers, applicable to any region of interest for genetic studies.
- The identified STRs provide valuable tools for further genetic analysis of the BRCA1 locus and surrounding regions.