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Identification of molecular mechanisms underlying developmental decision of Caenorhabditis elegans

Identification of molecular mechanisms underlying developmental decision of Caenorhabditis elegans
Translated Title
예쁜꼬마선충의 주변 환경 조건에 따른 장수유충 발달 유도를 조절하는 근본적인 분자적 기작 연구
Pyo, Seon Dong
DGIST Authors
Pyo, Seon Dong; Kim, Kyu Hyung; Kim, Eun Joo
Kim, Kyu Hyung
Kim, Eun Joo
Issue Date
Available Date
Degree Date
2016. 8
dauerneuropeptidetouch receptor neuron장수 유충신경펩타이드기계적 자극 감지 세포
Animals adapt to ever-changing environmental conditions to regulate their development. Our goal is to understand the mechanisms by which environmental signals are transduced and integrated with internal status to regulate development. The free-living nematode Caenorhabditis elegans undergoes reproductive development from egg to adult through four larval stages (L1-L4) in favorable environments. When L1 animals exposed to unfavorable environments, animals fail to initiate reproductive development and are arrested as stress-resistant and long-lived larva at dauer diapause, which is an alternative third developmental stage. However, how young animals make this developmental decision depending on environmental conditions at the time is not fully elucidated. To address this question, we first searched for genes of which expression pattern is altered at dauer diapause. Previous genetic studies have demonstrated that flp-8 or flp-4 FMRFamide-related peptide genes are differentially expressed in all touch receptor neurons of the dauer stage (Kim and Li, 2004). To identify the regulatory mechanism of flp gene expression, we first analyzed the flp gene promoter and found the putative cis-regulatory elements essential for expression in touch receptor neurons. We next found that expression of flp-8 in touch receptor neurons are regulated by MEC-3 and UNC-86, which are the transcription factors required for production and differentiation of the touch receptor neurons. To investigate whether this flp gene expression is regulated by the genes which are dauer-specific or involved in epigenetic mechanisms, we tested several candidate genes but none of animals carrying mutations in the genes displayed modified expression pattern both in non-dauer and dauer animals. Thus, our results suggest that unidentified genes or signaling pathways are likely to modify the expression of flp genes during dauer diapause, and that future genetic screen by mutagenesis may allow us to identify the nature of the genes or pathways. ⓒ 2016 DGIST
Table Of Contents
1. Introduction 1-- 2. Materials and Methods 3-- 2.1 Strains and transgenic animals 3-- 2.2 Generation of flp-8p::gfp-expressing animals 3-- 2.3 Dauer formation assay 4-- 2.4 Plasmid construction and quantification of GFP expression 4-- 2.5 Mutagenesis screen 4-- 3. Results 5-- 3.1 flp gene expression in TRNs is dependent on two transcription factors, MEC-3 and UNC-86 5-- 3.2 Potential cis-regulatory elements for flp gene expression in TRNs are identified 6-- 3.3 flp gene expression in dauer animals is not affected by the genes involved in major dauer formation pathways 7-- 3.4 Alteration of flp gene expression in dauer animals is not affected by the genes associated with chromatin remodeling 7-- 4. Discussion 9-- 5. Figures and Tables 11-- 6. References 23
Brain and Cognitive Sciences
Brain and Cognitive SciencesThesesMaster

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