5 Works

Accumulation of deleterious mutations in landlocked threespine stickleback populations

Jun Kitano, Kohta Yoshida, Mark Ravinet, Takashi Makino, Atsushi Toyoda, Tomoyuki Kokita & Seiichi Mori
Colonization of new habitats often reduces population sizes and may result in the accumulation of deleterious mutations by genetic drift. Compared to the genomic basis for adaptation to new environments, genome-wide analysis of deleterious mutations in isolated populations remains limited. In the present study, we investigated the accumulation of deleterious mutations in five endangered freshwater populations of threespine stickleback (Gasterosteus aculeatus) in the central part of the mainland of Japan. Using whole genome resequencing data,...

Neuronal octopamine signaling regulates mating-induced germline stem cell increase in female Drosophila melanogaster

Ryusuke Niwa, Yuto Yoshinari, Tomotsune Ameku, Shu Kondo, Hiromu Tanimoto, Takayuki Kuraishi & Yuko Shimada-Niwa
Stem cells fuel the development and maintenance of tissues. Many studies have addressed how local signals from neighboring niche cells regulate stem cell identity and their proliferative potential. However, the regulation of stem cells by tissue-extrinsic signals in response to environmental cues remains poorly understood. Here we report that efferent octopaminergic neurons projecting to the ovary are essential for germline stem cell (GSC) increase in response to mating in female Drosophila. The neuronal activity of...

Genome-wide patterns of divergence and introgression after secondary contact between Pungitius sticklebacks

Jun Kitano
Speciation is a continuous process. Although it is known that differential adaptation can initiate divergence even in the face of gene flow, we know relatively little about the mechanisms driving complete reproductive isolation and the genomic patterns of divergence and introgression at the later stages of speciation. Sticklebacks contain many pairs of sympatric species differing in levels of reproductive isolation and divergence history. Nevertheless, most previous studies have focused on young species pairs. Here, we...

Ethylene signaling mediates host invasion by parasitic plants

Songkui Cui, Tomoya Kubota, Tomoya Kubota, Tomoaki Nishiyama, Juliane Ishida, Shuji Shigenobu, Tomoko Shibata, Atsushi Toyoda, Mitsuyasu Hasebe, Ken Shirasu & Satoko Yoshida
Parasitic plants form a specialized organ, a haustorium, to invade host tissues and acquire water and nutrients. To understand the molecular mechanism of haustorium development, we performed a forward genetics screening to isolate mutants exhibiting haustorial defects in the model parasitic plant Phtheirospermum japonicum. We isolated two mutants that show prolonged and sometimes aberrant meristematic activity in the haustorium apex, resulting in severe defects on host invasion. Whole genome sequencing revealed that the two mutants...

Data from: Adaptive reduction of male gamete number in the selfing plant Arabidopsis thaliana

Takashi Tsuchimatsu, Hiroyuki Kakui, Misako Yamazaki, Cindy Marona, Hiroki Tsutsui, Afif Hedhly, Dazhe Meng, Yutaka Sato, Thomas St├Ądler, Ueli Grossniklaus, Masahiro Kanaoka, Michael Lenhard, Magnus Nordborg & Kentaro Shimizu
The number of male gametes is critical for reproductive success and varies between and within species. The evolutionary reduction of the number of pollen grains encompassing the male gametes is widespread in selfing plants. Here, we employ genome-wide association study (GWAS) to identify underlying loci and to assess the molecular signatures of selection on pollen number-associated loci in the predominantly selfing plant Arabidopsis thaliana. Regions of strong association with pollen number are enriched for signatures...

Registration Year

  • 2020
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Affiliations

  • National Institute of Genetics
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  • Tohoku University
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  • Kanazawa University
    2
  • Gifu Kyoritsu University
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  • University of Tsukuba
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  • Fukui Prefectural University
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  • University of Zurich
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  • University of Potsdam
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  • Nagoya University
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  • Niigata University
    1