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Remnants of the Balbiani body are required for formation of RNA transport granules in Xenopus oocytes

By Chao Yang, Gena M Wilson, Matthew M. Champion, Paul W. Huber

Posted 30 May 2020
bioRxiv DOI: 10.1101/2020.05.27.119487

Fragmentation of the Balbiani body in Xenopus oocytes engenders a region extending from the germinal vesicle (GV) towards the vegetal pole that is enriched in mitochondria. This area is later transversed by RNA that is being localized to the vegetal cortex. Inhibition of mitochondrial ATP synthesis prevents the perinuclear formation of these RNA transport granules that can be reversed by the nonhydrolyzable ATP analog, adenosine 5'-(beta,gamma-imido) triphosphate. The protein composition and sensitivity of the transport granules to hexanediol indicate that they are liquid phase condensates. Mitochondria in the remnants of the Balbiani body produce a region of elevated ATP that appears to act as a hydrotrope to support the perinuclear phase transition leading to granule formation. ### Competing Interest Statement The authors have declared no competing interest.

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