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SUMMARY:Insights into a symbiotic trade-off: Immunity and cell processes i
 n weevil endosymbiosis control
DTSTART:20160111T113000
DTEND:20160111T123000
DTSTAMP:20260503T144943Z
UID:79d4e5f9466eda20889ee17e6701b54050ce96f68a070a6d7773443c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Florent MASSON - INSA de Lyon\nMany insect species rely on int
 racellular mutualistic bacteria\, called obligatory endosymbionts\, for th
 eir development and reproduction. These bacterial partners supply them wit
 h metabolic components lacking in their diet\, driving their successful ad
 aptation to nutritionally unbalanced environments. Although such associati
 ons have been widely investigated on a physiological and evolutionary poin
 t of view\, the mechanisms involved in the maintenance and the control of 
 endosymbionts by the host remain elusive.\nUsing the cereal weevil\, Sitop
 hilus oryzae\, and its obligate endosymbiont Sodalis pierantonius as a mod
 el system\, we were able to reveal several mechanisms ensuring a tight con
 trol of the endosymbiont load. At the larval stage\, when host needs are s
 table\, endosymbionts are statically maintained through a modulated immune
  response. At the adult stage when host needs are changing\, immune contro
 l is strengthened by cell processes that adjust symbiont load to the host 
 metabolic requirement\, allowing the host to optimize its developmental ti
 me span and securing the cost and benefit trade-off of symbiosis. I will d
 iscuss how these different strategies selected during host-symbiont coevol
 ution ensure the tight adjustment of endosymbionts population along the in
 sect life cycle and according to its physiological needs.
LOCATION:AI 1153 https://plan.epfl.ch/?room==AI%201153
STATUS:CONFIRMED
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