Fine-mapping of fearfulness

Geneticists cut their teeth on conditions controlled by single loci. The harder task is to find the many loci that work together to control a single trait. In the 7 November Proceedings of the National Academy of Sciences Mott et al. demonstrate a new method for mapping these quantitative trait loci (QTL; Proc Natl Acad Sci USA 2000, published online before print). Previous methods all have their limits: family-based studies tend to be small and so can only do coarse mapping; population-based as

By | October 31, 2000

Geneticists cut their teeth on conditions controlled by single loci. The harder task is to find the many loci that work together to control a single trait. In the 7 November Proceedings of the National Academy of Sciences Mott et al. demonstrate a new method for mapping these quantitative trait loci (QTL; Proc Natl Acad Sci USA 2000, published online before print). Previous methods all have their limits: family-based studies tend to be small and so can only do coarse mapping; population-based association studies give greater numbers (and thus potentially greater resolution) but are complicated by variable and unknown inheritance histories; and breeding studies in mice are plagued by a possible lack of segregating loci when two inbred mouse populations are used as founders. Mott et al. get around this last problem by using the progeny from an eight-way cross that was started 30 years ago and is now in its 60th generation. They use dynamic programming to calculate the probability that a given allele is descended from one of the eight progenitors. Use of single-marker association often fails because different QTL alleles occur on similar haplotypes, but multipoint analysis allows the authors to fine-map all five of the previously identified loci for fearfulness in mice. The authors propose that whole-genome fine mapping with this method would be cost-effective if 20 or more traits were mapped in parallel on the same set of mice.

Popular Now

  1. Broad Wins CRISPR Patent Interference Case
    Daily News Broad Wins CRISPR Patent Interference Case

    The USPTO’s Patent Trial and Appeal Board has ruled in favor of the Broad Institute of MIT and Harvard retaining intellectual property rights covered by its patents for CRISPR gene-editing technology.

  2. Henrietta Lacks’s Family Seeks Compensation
  3. Can Plants Learn to Associate Stimuli with Reward?
  4. Humans Never Stopped Evolving
    Features Humans Never Stopped Evolving

    The emergence of blood abnormalities, an adult ability to digest milk, and changes in our physical appearance point to the continued evolution of the human race.

Business Birmingham