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Prolificacy genes in sheep: the French genetic programmes
1INRA, Laboratoire de Génétique Cellulaire, BP 27, 31326 Castanet-Tolosan, France. mulsant@toulouse.inra.fr
Reproduction (Cambridge, England). Supplement
|November 26, 2003
Summary
Genetic variations in sheep influence litter size and ovulation rates. Researchers identified the Booroola (FecB) gene mutation in bone morphogenetic protein receptor type IB (BMPR-IB) and are investigating the Lacaune gene to understand follicle development.
Area of Science:
- Animal Genetics
- Reproductive Biology
- Molecular Endocrinology
Background:
- Variations in sheep litter size and ovulation rates are linked to major gene segregation.
- Natural genetic mutants offer insights into ovarian follicle development pathways.
Purpose of the Study:
- Identify genes controlling prolificacy in sheep breeds.
- Characterize the genetic basis of enhanced ovulation rates.
Main Methods:
- Utilized French genetic programs to study Booroola (FecB) and Lacaune genes.
- Performed positional cloning and linkage testing for candidate genes.
- Analyzed mutations within the bone morphogenetic protein receptor type IB (BMPR-IB) gene.
Main Results:
- The FecB mutation involves a Q249R change in the BMPR-IB gene's signaling domain.
- The Lacaune gene is located on ovine chromosome 11, with identification in progress.
Conclusions:
- Specific gene mutations significantly impact sheep reproductive traits.
- Further research aims to classify prolificacy genes using linkage analysis.