Zuchegna, Candida (2014) Mechanism of retinoic acid-induced transcription: histone code, DNA oxidation and formation of chromatin loops. [Tesi di dottorato]
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| Item Type: | Tesi di dottorato |
|---|---|
| Resource language: | English |
| Title: | Mechanism of retinoic acid-induced transcription: histone code, DNA oxidation and formation of chromatin loops |
| Creators: | Creators Email Zuchegna, Candida candida.zuchegna@alice.it |
| Date: | 30 March 2014 |
| Number of Pages: | 106 |
| Institution: | Università degli Studi di Napoli Federico II |
| Department: | Medicina Molecolare e Biotecnologie Mediche |
| Scuola di dottorato: | Medicina molecolare |
| Dottorato: | Patologia e fisiopatologia molecolare |
| Ciclo di dottorato: | 26 |
| Coordinatore del Corso di dottorato: | nome email Avvedimento, Vittorio Enrico avvedim@unina.it |
| Tutor: | nome email Porcellini, Antonio UNSPECIFIED |
| Date: | 30 March 2014 |
| Number of Pages: | 106 |
| Keywords: | gene loops, histone code, retinoic acid |
| Settori scientifico-disciplinari del MIUR: | Area 05 - Scienze biologiche > BIO/11 - Biologia molecolare Area 06 - Scienze mediche > MED/04 - Patologia generale |
| Date Deposited: | 10 Apr 2014 13:23 |
| Last Modified: | 26 Jan 2015 11:30 |
| URI: | http://www.fedoa.unina.it/id/eprint/9829 |
Collection description
Histone methylation changes and formation of chromatin loops involving enhancers, promoters and 3' end regions of genes have been variously associated with active transcription in eukaryotes. It is not known if these events are mechanistically linked and their specific role in transcription initiation. We have studied the effect of activation of the Retinoic A receptor, at the RARE-promoter chromatin of CASP9 and CYP26A1 genes, at 15 and 45 min following RA exposure, and we found that histone H3 lysine 4 and 9 are demethylated by the lysinespecific demethylase, LSD1 and by the JMJ-domain containing demethylase, D2A. The action of the oxidase (LSD1) and a dioxygenase (JMJD2A) in the presence of Fe++ elicits an oxidation wave that locally modifies the DNA locally and recruits the enzymes involved in base and nucleotide excision repair (BER and NER). These events are essential for the formation of chromatin loop(s) that juxtapose the RARE element with the 5' transcription start site and the 3' end of the genes. The RARE bound-receptor governs the 5' and 3' end selection and directs the productive transcription cycle of RNA polymerase. This is the first demonstration that chromatin loops, histone methylation changes and localized DNA repair are mechanistically linked.
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