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High-resolution landmark framework for the sequence-ready mapping of Xq23-q26.1
H E Steingruber1, A Dunham, A J Coffey
1The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, UK.
Genome Research
|August 14, 1999
Summary
Researchers created a detailed human X chromosome map using yeast artificial chromosome (YAC) clones. This framework map aids in assembling a sequence-ready map for the international X chromosome sequencing effort.
Area of Science:
- Genomics
- Human Genetics
- Molecular Biology
Background:
- The human X chromosome is crucial for genetic diversity and understanding sex-linked traits.
- Comprehensive physical maps are essential for genome sequencing and gene mapping projects.
Purpose of the Study:
- To establish a high-resolution framework map of a 20-25 Mb region on the long arm of the human X chromosome.
- To facilitate the assembly of a sequence-ready map for the international X chromosome sequencing initiative.
Main Methods:
- Utilized yeast artificial chromosome (YAC) clones to construct the framework map.
- Employed somatic-cell hybrids and fluorescence in situ hybridization (FISH) for positioning and orientation of YAC contigs.
Main Results:
- Developed a framework map with approximately one landmark per 45 kb, spanning proximal Xq23 to proximal Xq26.
- Identified three gaps in the map and estimated their maximum sizes.
- Positioned four YAC contigs, with the largest covering an estimated 15 Mb.
- PAC and BAC contigs cover 18 Mb, with 12 Mb of finished sequence available.
Conclusions:
- The established YAC-based framework map provides a crucial resource for X chromosome research.
- This map is instrumental in the ongoing international effort to sequence the entire human X chromosome.