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DTSTART:20180325T030000
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DTSTART:20171029T020000
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DTSTAMP:20260424T040537Z
UID:59bb857594270262693145@ist.ac.at
DTSTART:20171128T120000
DTEND:20171128T133000
DESCRIPTION:Speaker: Deborah Charlesworth\nhosted by Nick Barton\nAbstract:
  Biological situations involving conflict can produce arms race situations
  with repeated fixations of different functional variants\, producing sele
 ctive sweeps and lower neutral diversity around the functional locus. Alte
 rnatively\, they can lead to balancing selection\, potentially creating lo
 ng coalescent times for sites with functionally different variants\, and f
 or haplotypes carrying such variants if they are located in non-recombinin
 g genome regions. We tested between these possibilities in a gynodioecious
  plant\, Plantago lanceolata\, in which cytoplasmic male-sterility factors
  conflict with nuclear restorers of male fertility. We find low mitochondr
 ial diversity. However\, we found a derived haplotype that has a restricte
 d geographic distribution\, and is associated with male fertility\, and ha
 s fixed differences from the ancestral sequence in several genes\, suggest
 ing that it did not arise very recently. The results suggest soft" selecti
 ve sweeps involving a moderately old-established haplotype\, consistent wi
 th the frequency fluctuations predicted by theoretical models of gynodioec
 y.
LOCATION:I22 Lakeside View (I22.01)\, ISTA
ORGANIZER:cfraisse@ist.ac.at
SUMMARY:Deborah Charlesworth: A molecular evolutionary investigation of an 
 arms-race associated with male-sterility in a plant
URL:https://talks-calendar.ista.ac.at/events/900
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