A radiation hybrid transcript map of the mouse genome

Area of Science:

• Genomics
• Comparative Genomics

Background:

• Expressed-sequence tag (EST) maps complement sequence-based gene detection.
• Radiation hybrid (RH) maps are established for several species, including mouse.
• EST maps provide anchors for homology and orthology mapping, particularly in species lacking extensive sequencing data.

Purpose of the Study:

• To establish a comprehensive first-generation radiation hybrid map for the mouse.
• To identify genes expressed during early mouse embryogenesis.
• To assess the utility of the mouse RH map for predicting human orthologs.

Main Methods:

• Construction of a mouse radiation hybrid map utilizing 5,904 markers (3,993 ESTs and 1,911 sequence-tagged sites).
• Analysis of EST clusters to identify genes expressed during early mouse embryogenesis.
• In situ hybridization to validate singleton ESTs as transcribed sequences.
• Comparative mapping of mouse chromosomes 12 and 14 against human chromosome 14.

Main Results:

• A comprehensive mouse RH map with 5,904 mapped markers was successfully established.
• The mapped ESTs are enriched for genes involved in early mouse embryogenesis and may differ from human gene sets.
• Singleton ESTs were confirmed as bona fide transcribed sequences.
• The map demonstrated predictive power for orthology mapping between mouse and human chromosomes.

Conclusions:

• The developed mouse radiation hybrid map is a valuable resource for gene localization and comparative genomics.
• The map facilitates the identification of novel genes, particularly those active during early development.
• This resource enhances the potential for cross-species comparative mapping and understanding of conserved gene functions.