Thursday Seminar: Genome dynamics and the evolution of germline/soma distinctions across the (eukaryotic) tree of life


Nov
20
2014

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  • Speaker: Laura Katz, Elsie Damon Simonds Professor, Department of Biological Sciences, Smith College
  • Host Department: Ecology and Evolutionary Biology (EEB)
  • Date: 11/20/2014
  • Time: 4:10 PM - 5:00 PM

  • Location: 1210 Chemistry

  • Description:

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    Abstract
    In contrast to the typified view of genomes as fixed within species, we find considerable evidence for genome dynamics (e.g. cyclical polyploidization, chromosomal rearrangements) across the eukaryotic tree of life. Based on these data, we hypothesized that LECA, the last eukaryotic common ancestor, had a dynamic genome that used epigenetic mechanisms to distinguish germline (i.e. to be inherited) from somatic genome material. Though fewer data exist for bacteria and archaea, there is also evidence of genome dynamics among these lineages suggesting either multiple or very ancient origins of the dynamic processes. Together, these data challenge ideas on the nature of genomes across the tree of life.

    Host: Professor Tim James

    Coffee and cookies will be served at 4 p.m.