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Golin, Serena (2018) The Mitochondrial Protein Whirly2 Regulates Seed Germination and Early Stages of Growth in Arabidopsis Thaliana. [Tesi di dottorato]

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Abstract (inglese)

Variations in amount and structural integrity of organellar DNA are tightly regulated by nuclear-organelle cross-talk. Whirly proteins are DNA binding proteins that were shown to play a role in organellar DNA maintenance and organization [Marechal et al. 2008; Cappadocia et al 2010]. Arabidopsis thaliana has three Whirly proteins with different subcellular localization: Whirly1 and Whirly3 are targeted to chloroplasts, while Whirly2 is targeted to mitochondria [Krause et al. 2005]. WHIRLY2 gene expression is related to early plant development, being expressed in imbibed seeds, shoot apex and roots of young seedlings. A T-DNA insertional mutant for the WHIRLY2 gene shows an obvious phenotype on seeds, germination and early stages of plant growth. At subcellular level Whirly2 regulates mitochondria morphology, dynamics and functionality of the electron transport chain. Transmitted electron microscopy (TEM) revealed that Whirly2 is a major mitochondrial nucleoids organizer, and it influences both mtDNA and ptDNA copy number. Moreover, our results suggest a coordination of WHIRLY genes that controls expression of target genes of organellar signals upon development and stress conditions.

Abstract (italiano)

Le variazioni della quantità e dell'integrità strutturale del DNA degli organelli sono strettamente regolate dal cross-talk tra i vari compartimenti subcellulari. Le proteine Whirly sono in grado di legare il DNA ed è stato dimostrato come esse abbiano un ruolo chiave nel mantenimento e nell’organizzazione strutturale del DNA degli organelli [Marechal et al. 2008; Cappadocia et al 2010]. Arabidopsis thaliana possiede tre proteine Whirly con diversa localizzazione subcellulare: Whirly1 e Whirly3 localizzano nei cloroplasti, mentre Whirly2 localizza a livello mitocondriale [Krause et al. 2005]. È stato osservato come l’espressione del gene WHIRLY2 sia modulata durante la crescita della pianta. In particolare, WHIRLY2 è maggiormente espresso nei semi imbibiti e nei meristemi apicali e radicali. Il mutante inserzionale per il gene WHIRLY2 presenta infatti, un chiaro fenotipo nello sviluppo del seme e nella germinazione. A livello subcellulare, Whirly2 regola la morfologia, la dinamica e la funzionalità mitocondriale. Inoltre, è stato rilevato come Whirly2 sia indispensabile nel mantenimento strutturale dei nucleoidi mitocondriali e del contenuto DNA negli organelli. In aggiunta, i nostri risultati suggeriscono un coordinamento nell’espressione dei geni WHIRLY con lo scopo di mantenere un’adeguata omeostasi cellulare sia durante lo sviluppo che in condizioni di stress.

Tipo di EPrint:Tesi di dottorato
Relatore:Zottini, Michela
Dottorato (corsi e scuole):Ciclo 30 > Corsi 30 > BIOSCIENZE
Data di deposito della tesi:15 Gennaio 2018
Anno di Pubblicazione:15 Gennaio 2018
Parole chiave (italiano / inglese):segnale retrogrado dei mitocondri/mitochondria retrograde signalling piante/plants Arabidopsis thaliana Whirly2 sviluppo e germinazione del seme/seed development and germinazion mitocondri piante/ plant mitochondria nucleoidi/nucleoids
Settori scientifico-disciplinari MIUR:Area 05 - Scienze biologiche > BIO/04 Fisiologia vegetale
Struttura di riferimento:Dipartimenti > Dipartimento di Biologia
Codice ID:10935
Depositato il:26 Ott 2018 08:45
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