Discovery of a novel type of autophagy targeting RNA

Yuuki Fujiwara, Akiko Furuta, Hisae Kikuchi, Shu Aizawa, Yusuke Hatanaka, Chiho Konya, Kenko Uchida, Aya Yoshimura, Yoshitaka Tamai, Keiji Wada, Tomohiro Kabuta

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    79 Citations (Scopus)

    Abstract

    Regulated degradation of cellular components by lysosomes is essential to maintain biological homeostasis. In mammals, three forms of autophagy, macroautophagy, microautophagy and chaperone-mediated autophagy (CMA), have been identified. Here, we showed a novel type of autophagy, in which RNA is taken up directly into lysosomes for degradation. This pathway, which we term 'RNautophagy,' is ATP-dependent, and unlike CMA, is independent of HSPA8/ Hsc70. LAMP2C, a lysosomal membrane protein, serves as a receptor for this pathway. The cytosolic tail of LAMP2C specifically binds to almost all total RNA derived from mouse brain. The cytosolic sequence of LAMP2C and its affinity for RNA are evolutionarily conserved from nematodes to humans. Our findings shed light on the mechanisms underlying RNA homeostasis in higher eukaryotes.

    Original languageEnglish
    Pages (from-to)403-409
    Number of pages7
    JournalAutophagy
    Volume9
    Issue number3
    DOIs
    Publication statusPublished - 2013 Mar

    Keywords

    • Autophagy
    • LAMP
    • LAMP-2
    • LAMP-2C
    • LAMP2
    • LAMP2C
    • RNA
    • RNautophagy

    ASJC Scopus subject areas

    • Cell Biology
    • Molecular Biology

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  • Cite this

    Fujiwara, Y., Furuta, A., Kikuchi, H., Aizawa, S., Hatanaka, Y., Konya, C., Uchida, K., Yoshimura, A., Tamai, Y., Wada, K., & Kabuta, T. (2013). Discovery of a novel type of autophagy targeting RNA. Autophagy, 9(3), 403-409. https://doi.org/10.4161/auto.23002