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Ciao1 interacts with Crumbs and Xpd to regulate organ growth in Drosophila. | LitMetric

AI Article Synopsis

Article Abstract

Ciao1 is a component of the cytosolic iron-sulfur cluster assembly (CIA) complex along with MMS19 and MIP18. Xeroderma pigmentosum group D (XPD), a DNA helicase involved in regulation of cell cycle and transcription, is a CIA target for iron-sulfur (Fe/S) modification. In vivo function of Ciao1 and Xpd in developing animals has been rarely studied. Here, we reveal that Ciao1 interacts with Crumbs (Crb), Galla, and Xpd to regulate organ growth in Drosophila. Abnormal growth of eye by overexpressing Crb intracellular domain (Crb) is suppressed by reducing the Ciao1 level. Loss of Ciao1 or Xpd causes similar impairment in organ growth. RNAi knockdown of both Ciao1 and Xpd show similar phenotypes as Ciao1 or Xpd RNAi alone, suggesting their function in a pathway. Growth defects caused by Ciao1 RNAi are suppressed by overexpression of Xpd. Ciao1 physically interacts with Crb, Galla, and Xpd, supporting their genetic interactions. Remarkably, Xpd RNAi defects can also be suppressed by Ciao1 overexpression, implying a mutual regulation between the two genes. Ciao1 mutant clones in imaginal discs show decreased levels of Cyclin E (CycE) and death-associated inhibitor of apoptosis 1 (Diap1). Xpd mutant clones share the similar reduction of CycE and Diap1. Consequently, knockdown of Ciao1 and Xpd by RNAi show increased apoptotic cell death. Further, CycE overexpression is sufficient to restore the growth defects from Ciao1 RNAi or Xpd RNAi. Interestingly, Diap1 overexpression in Ciao1 mutant clones induces CycE expression, suggesting that reduced CycE in Ciao1 mutant cells is secondary to loss of Diap1. Taken together, this study reveals new roles of Ciao1 and Xpd in cell survival and growth through regulating Diap1 level during organ development.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7220951PMC
http://dx.doi.org/10.1038/s41419-020-2564-3DOI Listing

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