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The importance of the nuclear positioning of the PPARG gene for its expression during porcine in vitro adipogenesis.

Authors
  • Stachecka, Joanna1
  • Nowacka-Woszuk, Joanna1
  • Kolodziejski, Pawel A2
  • Szczerbal, Izabela3
  • 1 Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637, Poznan, Poland. , (Poland)
  • 2 Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland. , (Poland)
  • 3 Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637, Poznan, Poland. [email protected] , (Poland)
Type
Published Article
Journal
Chromosome Research
Publisher
Springer-Verlag
Publication Date
Sep 01, 2019
Volume
27
Issue
3
Pages
271–284
Identifiers
DOI: 10.1007/s10577-019-09604-2
PMID: 30656515
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Proper expression of the PPARG gene, which encodes a key transcription factor of adipogenesis, is indispensable in the formation of mature adipocytes. The positioning of a gene within the nuclear space has been implicated in gene regulation. We here report on the significance of the PPARG gene's nuclear positioning for its activity during in vitro adipogenesis in the pig. We used an established system of differentiation of mesenchymal stem cells derived from bone marrow and adipose tissue into adipocytes. The differentiation process was carried out for 7 days, and the cells were examined using the 3D DNA/immuno-FISH and RNA/DNA-FISH approaches. PPARG transcript level was measured using real-time PCR, and PPARγ activity was detected with colorimetric assay. Changes in the nuclear location of the PPARG gene were observed when we compared undifferentiated mesenchymal stem cells with mature adipocytes. The gene moved from the nuclear periphery to the nuclear center as its transcriptional activity increased. The RNA/DNA-FISH approach shows that differences in primary transcript production correlated with the allele's nuclear positioning. Transcriptionally active alleles preferentially occupy the central part of the nucleus, while inactive alleles are found on the nuclear periphery. We also show that transcription of PPARG begins with one allele, but that both alleles are active in later stages of differentiation. Our results provide evidence that functionally distinct alleles of the PPARG gene are positioned in different parts of the cell nucleus. This confirms the importance of nuclear architecture to the regulation of PPARG gene transcription, and thus to the fate of the adipose cell.

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