A cilia-independent function of BBSome mediated by DLK-MAPK signaling in C. elegans photosensation.

Xinxing Zhang, Jinzhi Liu, Tong Pan, Alex Ward, Jianfeng Liu, X Z Shawn Xu

Developmental cell 2022 Jun 20

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Bardet-Biedl syndrome (BBS) is a genetic disorder that affects primary cilia. BBSome, a protein complex composed of eight BBS proteins, regulates the structure and function of cilia, and its malfunction causes BBS in humans. Here, we report a cilia-independent function of BBSome. To identify genes that regulate the C. elegans photoreceptor protein LITE-1 in ciliated ASH photosensory neurons, we performed a genetic screen and isolated bbs mutants. Functional analysis revealed that BBSome regulates LITE-1 protein stability independently of cilia. Through another round of genetic screening, we found that this cilia-independent function of BBSome is mediated by DLK-MAPK signaling, which acts downstream of BBSome to control LITE-1 stability via Rab5-mediated endocytosis. BBSome exerts its function by regulating the expression of DLK. BBSome also regulates the expression of LZK, a mammalian DLK in human cells. These studies identify a cilia-independent function of BBSome and uncover DLK as an evolutionarily conserved BBSome effector. Copyright © 2022 Elsevier Inc. All rights reserved.

Citation

Xinxing Zhang, Jinzhi Liu, Tong Pan, Alex Ward, Jianfeng Liu, X Z Shawn Xu. A cilia-independent function of BBSome mediated by DLK-MAPK signaling in C. elegans photosensation. Developmental cell. 2022 Jun 20;57(12):1545-1557.e4