6th October, 15PM-17PM, Building 16, Room 107,

15:00-

「Metabolic Making of Monomorphic ant 」

Yasukazu Okada

(University of Tokyo)

15:30-

「Arrhythmic Adaptation of Ant Activity」

Haruna Fujioka

(University of Tokyo)

16:00-

「Sea, Sex, Supergenes an Sociality」

Laurent Keller

(University of Lausanne)

Intraspecific variability in social organization is common, yet the underlying causes are rarely known. In this talk I will show that the existence of two divergent forms of social organization is under the control of a pair of heteromorphic chromosomes that have many of the key properties of sex chromosomes. In particular, this social chromosome contains a large (13 megabases) region in which recombination is completely suppressed. The lack of recombination which is due to several inversions, has led to the accumulation of deleterious mutations, including repetitive elements. Many genes differentially expressed between individuals of the two social forms reside in the non-recombining region. These findings highlight how genomic rearrangements can maintain divergent adaptive social phenotypes involving many genes acting together by locally limiting recombination.