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A first-generation map of the turkey genome
David E Harry1, David Zaitlin, Paul J Marini
1Nicholas Turkey Breeding Farms, Sonoma, CA 95746, USA. deharry@ix.netcom.com
Genome
|November 11, 2003
Summary
Researchers developed a turkey genome map using genetic markers. This map, based on expressed genes, includes 138 loci and provides a framework for future turkey genome studies.
Area of Science:
- Genomics
- Animal Genetics
Background:
- A comprehensive genetic map is crucial for understanding genome organization and facilitating genetic improvement in domestic animals.
- The domestic turkey (Meleagris gallopavo) genome has been less extensively studied compared to other livestock species, necessitating the development of foundational mapping resources.
Purpose of the Study:
- To construct a primary genetic linkage map for the domestic turkey using expressed sequence tags (ESTs).
- To establish a framework for future high-density mapping and comparative genomics in Meleagris gallopavo.
Main Methods:
- Segregation analysis of genetic markers within an 84-offspring backcross family.
- Restriction fragment length polymorphism (RFLP) detection using probes from a whole-embryo cDNA library.
- DNA sequencing of cDNA clones and BLAST searches against GenBank for sequence identification and redundancy removal.
Main Results:
- A map comprising 138 loci, with 113 loci organized into 22 linkage groups and 25 unlinked loci.
- Average distance between linked markers of 6 cM, with the longest linkage group spanning 131 cM.
- Identification of sequence similarity between 23% of turkey sequences and chicken mRNA, suggesting conserved gene order.
Conclusions:
- The developed linkage map serves as a foundational resource for turkey genomics.
- This map will aid in future genome-wide association studies, marker-assisted selection, and comparative genomic analyses in turkeys.