Skeletal muscle plasticity induced by seasonal acclimatization in carp involves differential expression of rRNA and molecules that epigenetically regulate its synthesis

Eduardo N. Fuentes, Rodrigo Zuloaga, Gino Nardocci, Catalina Fernandez de la Reguera, Nicolas Simonet, Robinson Fumeron, Juan Antonio Valdes, Alfredo Molina, Marco Alvarez

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Ribosomal biogenesis controls cellular growth in living organisms, with the rate-limiting step of this process being the transcription of ribosomal DNA (rDNA). Considering that epigenetic mechanisms allow an organism to respond to environmental changes, the expression in muscle of several molecules that regulate epigenetic rRNA synthesis, as well as rDNA transcription, were evaluated during the seasonal acclimatization of the carp. First, the nucleotide sequences encoding the components forming the NoRC (ttf-I, tip5) and eNoSC (sirt1, nml, suv39h1), two chromatin remodeling complexes that silence rRNA synthesis, as well as the sequence of ubf1, a key regulator of rDNA transcription, were obtained. Subsequently the transcriptional regulation of the aforementioned molecules, and other key molecules involved in rRNA synthesis (mh2a1, mh2a2, h2a.z, h2a.z.7, nuc, p80), was assessed. The carp sequences for TTF-I, TIP5, SIRT1, NML, SUV39H1, and UBF1 showed a high conservation of domains and key amino acids in comparison with other fish and higher vertebrates. The mRNA contents in muscle for ttf-I, tip5, sirt1, nml, suv39h1, mh2a1, mh2a.z, and nuc were up-regulated during winter in comparison with summer, whereas the mRNA levels of mh2a2, ubf1, and p80 were down-regulated. Also, the contents of molecules involved in processing the rRNA (snoRNAs) and pRNA, a stabilizer of NoRC complex, were analyzed, finding that these non-coding RNAs were not affected by seasonal acclimatization. These results suggest that variations in the expression of rRNA and the molecules that epigenetically regulate its synthesis are contributing to the muscle plasticity induced by seasonal acclimatization in carp.

Original languageEnglish
Pages (from-to)57-66
Number of pages10
JournalComparative Biochemistry and Physiology Part - B: Biochemistry and Molecular Biology
Volume172-173
Issue number1
DOIs
Publication statusPublished - Jun 2014

Keywords

  • Epigenetics
  • Fish
  • Muscle
  • RDNA transcription
  • Seasonal acclimatization

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology

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