Directly to content
  1. Publishing |
  2. Search |
  3. Browse |
  4. Recent items rss |
  5. Open Access |
  6. Jur. Issues |
  7. DeutschClear Cookie - decide language by browser settings

Clock controlled gene-9 is a trehalose phosphorylase which does not contribute to growth or development in Neurospora crassa

Schneider, Christoph

[thumbnail of 09_12_14 v2.pdf]
Preview
PDF, English
Download (3MB) | Terms of use

Citation of documents: Please do not cite the URL that is displayed in your browser location input, instead use the DOI, URN or the persistent URL below, as we can guarantee their long-time accessibility.

Abstract

This study was originally designed to investigate the role of global cellular processes like the cell cycle in mediating signal from the circadian clock to rhythmic growth and development in Neurospora crassa. In a first attempt clock control over growth and cell cycle related genes was tested by real-time monitoring of gene expression with a luciferase based assay. It was observed that under conditions, which restrict growth and conidiation, the target genes showed no or poor rhythmicity. In contrast, under native growth conditions or in cultures which overcome growth repression by aging rhythmic gene expression could be observed in any of the target genes. Surprisingly, this included also typical “housekeeping” genes like tubulin, histoneH1 or actin for example. A further hallmark of these rhythms was that they were equal in phase even in genes which had previously been reported to be expressed antiphasic (Sancar et al., 2011). These observations suggest that the luciferase assay may interfere with clock controlled processes which are related to native growth. With a further project the role of clock control over metabolism for rhythmic growth should be analyzed. For this purpose a mutant was characterized which had been shown to be defective in the trehalose synthase clock controlled gene 9 (ccg-9RIP) (Shinohara et al., 2002). The mutant displays the loss of clock control over conidiation and a severe defect in vegetative growth and asexual development. These observations strongly suggested a link between clock control over carbohydrate metabolism and circadian growth. Changes in the transcriptome during conidiation were analyzed in ccg-9RIP. The majority of misregulated genes are related to metabolic functions. However, genotype and phenotype of ccg-9RIP did not cosegregate during backcrossing. A knockout of ccg-9 by gene replacement grew rhythmic and did not show any defect during vegetative growth and asexual development under several conditions. These results demonstrate that ccg-9 does not have any role in circadian growth. Furthermore, the phenotype of ccg-9RIP must be caused by disruption of other genes than ccg-9.

Document type: Dissertation
Supervisor: Brunner, Prof. Dr. Michael
Date of thesis defense: 12 February 2015
Date Deposited: 09 Mar 2015 10:27
Date: 2015
Faculties / Institutes: Service facilities > Heidelberg University Biochemistry Center
DDC-classification: 500 Natural sciences and mathematics
570 Life sciences
About | FAQ | Contact | Imprint |
OA-LogoDINI certificate 2013Logo der Open-Archives-Initiative