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Abstract Detail


Recent Topics Posters

Thompson, Stacey Lee [1], Bruneau, Anne [2], Ritland, Kermit [3].

A three-gene estimator of relatedness and its use in structured or sexually-variable populations.

Two-gene coefficients of identity can be used to estimate numerous population genetic parameters including pairwise relatedness between individuals (e.g. kinship), genetic structure within groups (e.g. inbreeding), and gene flow between populations (e.g. FST). However, alternative estimators can be derived that simultaneously sample three genes. These three genes can be from one (e.g. a polyploid) to three individuals.
Three-gene coefficients of identity cannot be predicted from combinations of two-gene coefficients (i.e. they are independent parameters), yet they may be statistically correlated and evolve in similar fashions. We present a method-of-moments estimator, derived by equating the observed similarity of the three sampled alleles with that theoretically expected based upon population homozygosities and the two-gene relatedness coefficients.
We then highlight some of the additional insights that three-gene relationship coefficients can provide for molecular marker-based studies of plant populations. These diverse applications include landscape genetic analyses, using "spatio-genetic triangulation". This new technique uses three-gene estimates of relatedness to examine two-dimensional patterns of genetic structure, and can inform conservation efforts. Three-gene identities can also be used to test whether asexuality plays a role in the promotion of inbreeding and spatial structure.


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Related Links:
A .pdf copy of this poster is availible at: http://skyscraperpage.com/~stacey/ThompsonBotany2007poster.pdf


1 - Université de Montréal, Institut de Recherche en Biologie Végétale, 4101 Sherbrooke Est, Montréal, QC, H1X 2B2, Canada
2 - Université de Montréal, Institut de recherche en biologie végétale, 4101 rue Sherbrooke est, Montréal, Québec, H1X 2B2, Canada
3 - University of British Columbia, Department of Forest Sciences, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada

Keywords:
relatedness
gene identity
landscape genetics
polyploidy
asexuality.

Presentation Type: Recent Topics Poster
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P79044
Abstract ID:2722


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