Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression profiles of Six1/2-1(RNAi) animals and POU2/3(RNAi) animals

ABSTRACT: The goal of this study was to identify genes that were expressed in the protonephridial system. Because Six1/2(RNAi) and POU2/3(RNAi) animals lose the tubules, flame cells and accessory cells, these animals were expected to show decreased levels of the genes expressed in the nephridial system relative to control RNAi animals. RNA from Six1/2(RNAi) and POU2/3(RNAi) animals was harvested with Trizol at days 8 and 15 after RNAi initiation for the former and days 15 and 21 for the latter. Three biological replicates were used. RNA from the four samples were competetively hybridized on a microarray with RNA from control RNAi animals of the corresponding days.

ORGANISM(S): Schmidtea mediterranea

SUBMITTER: Mansi Srivastava

PROVIDER: E-GEOD-31618 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

A regulatory program for excretory system regeneration in planarians.

Scimone M Lucila ML Srivastava Mansi M Bell George W GW Reddien Peter W PW

Development (Cambridge, England) 20111001 20

Planarians can regenerate any missing body part, requiring mechanisms for the production of organ systems in the adult, including their prominent tubule-based filtration excretory system called protonephridia. Here, we identify a set of genes, Six1/2-2, POU2/3, hunchback, Eya and Sall, that encode transcription regulatory proteins that are required for planarian protonephridia regeneration. During regeneration, planarian stem cells are induced to form a cell population in regeneration blastemas ...[more]

PMID: 21937596

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Project description:Animals can thrive on variable food resources as a result of autonomous processes and beneficial relationships with their gut microbes. Food intake elicits major physiological changes, which are compensated with transient systemic responses that maintain homeostasis in the organism. This integration of external information occurs through cellular sensory elements, such as nuclear receptors, which modulate gene expression in response to specific cues. Given the importance of the germline stem cells (GSCs) for the development of the germ line and the continuity of the species, it is reasonable to assume that GSCs might be shielded from the negative influence of environmental perturbations. To our knowledge, however, there are no mechanisms reported that protect proliferating germ cells from harmful dietary metabolites. Using Caenorhabditis elegans as a model, we report that the somatic activity of the conserved nuclear receptor nhr-114/HNF4 protects GSC divisions and GSC integrity from dietary metabolites. In the absence of nhr-114 and on certain bacterial diets, otherwise somatically normal animals accumulate germ cell division defects during development and become sterile. We find that in nhr-114(-) animals the induction of germline defects and sterility depends on the bacterial metabolic status with respect to the essential amino acid tryptophan. This illustrates an animal-microbe interaction in which somatic nuclear receptor activity preserves the germline by buffering against dietary metabolites, likely through a somatic detoxifying response. Overall, our findings uncover an unprecedented and presumably evolutionary conserved soma-to-germline axis of communication that maintains reproductive robustness on variable food resources. Trasncriptional profiles of adult sterile nhr-114(RNAi) animals were compared to those of sterile glp-1(q224ts) animals. Independently, the transcriptional profiles of wild type animals fed an OP50 diet supplemented with Tryptophan was compared to wild type animals fed a standard OP50 diet.

Dataset Information

Gene expression profiles of Six1/2-1(RNAi) animals and POU2/3(RNAi) animals

Publications

A regulatory program for excretory system regeneration in planarians.

Similar Datasets

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