第13回 配偶子制御セミナー


Mechanism and Evolution of Reproductive Plasticity in the Pea Aphid Acyrthosiphon pisum


講師  Dr. Dayalan Srinivasan
所属  Ecology and Evolution Dept., Princeton University
日時  平成22年3月3日(水)13:30-14:30 (山手連絡バスの到着にあわせて開始)
場所  自然科学研究機構 基礎生物学研究所 明大寺地区1階会議室(111)

講演の内容
Dr. Dayalan Srinivasanは,岡崎3研究所で行っている,JSPS先端学術研究人材養成事業「環境に対する生物の応答機構」の一環として,国際共同研究のために基生研に3ヶ月間滞在しています.ゲノムが解読され,環境応答研究の新モデル生物として注目を浴びているアブラムシの,生殖様式における表現型可塑性について発表していただきます.

Phenotypic plasticity in response to environmental change is a common phenomenon yet is poorly understood at the genetic and molecular level. Aphids exhibit plasticity in reproduction whereby seasonal changes result in asexual or sexual reproduction. We investigated the genetic basis of this reproductive plasticity by assessing meiosis and cell cycle genes from the genome of the pea aphid, Acyrthosiphon pisum. Aphids possess meiotic recombination genes and G1-to-S phase transition regulatory genes in gene copy numbers similar to other metazoans. Despite the lack of meiotic recombination in asexual aphids, meiosis genes are expressed in similar patterns between sexual and asexual aphids. However, the Spo11 meiosis gene is expressed at lower levels in asexual germ cells and oocytes and is spliced less efficiently. Additionally, regulatory genes that control the entry into and progression through cell division are duplicated in the aphid genome, and several of these paralogs exhibit differential expression between reproductive morphs. Together, this suggests that changes in the activity of several critical meiosis and cell cycle genes contribute to the expression of facultative asexuality in aphids.

問い合わせ ;
自然科学研究機構 岡崎統合バイオサイエンスセンター 
重信秀治 (shige@nibb.ac.jp)
℡:0564-59-5875

セミナー案内ダウンロード >>

>> Home