MicroRNA-185 oscillation controls circadian amplitude of mouse Cryptochrome 1 via translational regulation

Kyung Ha Lee, Sung Hoon Kim, Hwa Rim Lee, Wanil Kim, Do Yeon Kim, Jae Cheon Shin, Seung Hee Yoo, Kyong Tai Kim

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Mammalian circadian rhythm is observed not only at the suprachiasmatic nucleus, a master pacemaker, but also throughout the peripheral tissues. Investigation of the regulation of clock gene expression has mainly focused on transcriptional and posttranslational modifications, and little is known about the posttranscriptional regulation of these genes. In the present study, we investigate the role of microRNAs (miRNAs) in the posttranscriptional regulation of the 3′-untranslated region (UTR) of the mouse Cryptochrome 1 (mCry1) gene. Knockdown of Drosha, Dicer, or Argonaute2 increased mCry1-3′UTR reporter activity. The presence of the miRNA recognition element of mCry1 that is important for miR-185 binding decreased mCRY1 protein, but not mRNA, level. Cytoplasmic miR-185 levels were nearly antiphase to mCRY1 protein levels. Furthermore, miR-185 knockdown elevated the amplitude of mCRY1 protein oscillation. Our results suggest that miR-185 plays a role in the fine-tuned regulation of mCRY1 protein expression by controlling the rhythmicity of mCry1 mRNA translation.

Original languageEnglish (US)
Pages (from-to)2248-2255
Number of pages8
JournalMolecular biology of the cell
Issue number14
StatePublished - Jul 15 2013

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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