
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/">
  <dc:subject xml:lang="srp">OSNO - Opšta sistematizacija naučnih oblasti, Molekularna biologija</dc:subject>
  <dc:subject xml:lang="eng">OSNO - Opšta sistematizacija naučnih oblasti, Molekularna biologija</dc:subject>
  <dc:subject xml:lang="srp">Arx, CRISPR/Cas9, alfa ćelije pankreasa, dijabetes, editovanje epigenoma, ciljana metilacija DNK, transfekcija</dc:subject>
  <dc:subject xml:lang="eng">ARX, CRISPR/dCas9, pancreatic alpha cells, diabetes, epigenetic editing, targeted DNA methylation, transfection</dc:subject>
  <dc:subject xml:lang="srp">577.2:577.175.72(043.3) </dc:subject>
  <dc:creator id="https://plus.cobiss.net/cobiss/sr/sr/conor/100898569">Đorđević, Marija B., 1990-</dc:creator>
  <dc:identifier>https://phaidrabg.bg.ac.rs/o:31809</dc:identifier>
  <dc:identifier>cobiss:131078153</dc:identifier>
  <dc:identifier>thesis:9366</dc:identifier>
  <dc:format>96 str.</dc:format>
  <dc:format>6708104 bytes</dc:format>
  <dc:date>2023</dc:date>
  <dc:rights>http://creativecommons.org/licenses/by-nc-sa/3.0/at/legalcode</dc:rights>
  <dc:title xml:lang="srp">Transdiferencijacija alfa ćelija pankreasa miša u ćelije koje proizvode insulin ciljanom metilacijom DNK primenom Epi-CRISPR sistema : doktorska disertacija</dc:title>
  <dc:type>info:eu-repo/semantics/bachelorThesis</dc:type>
  <dc:description xml:lang="srp">Ekspresija gena za Arx (engl. Aristaless related homeobox) koji ima glavnu ulogu u održavanju identiteta alfa ćelija endokrinog pankreasa regulisana je metilacijom i predstavlja glavni target za ćelijsko reprogramiranje kao jedna od strategija u terapiji dijabetesa koji u osnovi ima poremećen izvor insulina usled propadanja beta ćelija.Cilj ove doktorske disertacije je podrazumevao ispitivanje sposobnosti transdiferencijacije alfa ćelija pankreasa miša u ćelije koje proizvode insulin nakon uvođenja metilacije u promotoru Arx-a. Nakon tranzijentne transfekcije αTC1-6 ćelijske linije pomoću epigenetičkog alata za ciljanu gensku represiju ispitivani su efekti uvedene metilacije na ekspresiju gena specifičnih za beta ćelije.Optimizacijom nukleofekcije αTC1-6 ćelija uspostavljeni su uslovi pomoću kojih je dostignuta efikasnost od 71,1% pri vijabilnosti ćelija od 80%. Visoka efikasnost uvođenja metilacije dCas9-Dnmt3a3L-KRAB fuzionim (EpiCRISPR) konstruktom je pokazana targetovanim bisulfitnim sekvenciranjem. Utišavanje Arx-a praćeno pokretanjem ekspresije Ins2 na 5. i 7. danu nakon transfekcije detektovano je metodom RT-qPCR-a i analizom transkriptoma. Proteinski nivo insulina detektovan je imunocitohemijskom metodom do 12. dana, a oslobađanje iz ćelija enzimskim imunoesejem na 7. danu nakon transfekcije. Pokretanje procesa transdiferencijacije αTC1-6 ćelija ispitivano je analizom prisustva markera beta ćelija.Rezultati su pokazali da jedna tranzijentna transfekcija može da inicira transdiferencijaciju ~1% alfa ćelija pankreasa u ćelije koje proizvode 35% više insulina u odnosu na lažno transfekovane (Mock) alfa ćelije. Delujući na plastičnu prirodu epigenoma, uspešno je iniciran proces direktnog reprogramiranja alfa ćelija pankreasa u ćelije koje proizvode insulin.</dc:description>
  <dc:description xml:lang="eng">Aristaless-related homeobox (Arx) gene expression level is regulated by DNA methylation, plaing an important role in the maintenance of pancreatic alpha cell identity. Diabetes is characterized by a disturbed source of insulin, representing a good candidate for cell reprogramming strategy in diabetes therapy by Arx targeting.The aim of this doctoral dissertation was to examine the transdifferentiation ability of murine pancreatic alpha cells into insulin-producing cells induced by the targeted DNA methylation in the Arx promoter. The expression of beta specific marker was analiysed in transiently transfected αTC1-6 cells with a synthetic epigenetic tool for gene repression.The optimization of αTC1-6 cells nucleofection was established conditions by which was achieved an efficiency of 71.1% with an 80% of cell viability. The high efficiency of methylation induction by the dCas9-Dnmt3a3L-KRAB fusion (EpiCRISPR) construct was confirmed by targeted bisulfite sequencing. The Arx silencing followed by induction of Ins2 expression on 5 and 7 days after transfection was detected by RT-qPCR and transcriptome analysis. The insulin protein level was detected immunocytochemicaly until the 12th post-transfection day, and released insulin was detected by the enzyme immunoassay on the 7th post-transfection day. The initiation of the transdifferentiation process of αTC1-6 cells was examined by analyzing the presence of beta cell specific markers.The results showed that a single transient transfection initiate the transdifferentiation of ~1% of alpha cells into cells that produce 35% more insulin compared to mock-transfected cells. Acting on the epigenome plastic nature, the direct reprogramming of pancreatic alpha cells into insulin-producing cells was successfully initiated.</dc:description>
  <dc:description xml:lang="srp">Biologija - Molekularna biologija / Biology- Molecular biology  
Datum odbrane: 05.07.2023. </dc:description>
  <dc:contributor id="https://plus.cobiss.net/cobiss/sr/sr/conor/13686375">Arambašić-Jovanović, Jelena, 1977-</dc:contributor>
  <dc:contributor id="https://plus.cobiss.net/cobiss/sr/sr/conor/22054759">Vidaković, Melita, 1972-</dc:contributor>
  <dc:contributor id="https://plus.cobiss.net/cobiss/sr/sr/conor/33414247">Dinić, Svetlana, 1971-</dc:contributor>
  <dc:contributor id="https://plus.cobiss.net/cobiss/sr/sr/conor/33400935">Tolić, Anja, 1988-</dc:contributor>
  <dc:contributor id="https://plus.cobiss.net/cobiss/sr/sr/conor/12846951">Savić-Pavićević, Dušanka, 1972-</dc:contributor>
  <dc:language>srp</dc:language>
</oai_dc:dc>
