RRC ID 76340
Author Zhang X, Liu J, Pan T, Ward A, Liu J, Xu XZS.
Title A cilia-independent function of BBSome mediated by DLK-MAPK signaling in C. elegans photosensation.
Journal Dev Cell
Abstract 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.
Volume 57(12)
Pages 1545-1557.e4
Published 2022-6-20
DOI 10.1016/j.devcel.2022.05.005
PII S1534-5807(22)00333-1
PMID 35649417
PMC PMC9233093
MeSH Animals Bardet-Biedl Syndrome* / genetics Bardet-Biedl Syndrome* / metabolism Caenorhabditis elegans / genetics Caenorhabditis elegans / metabolism Cilia* / metabolism Humans Mammals / metabolism Protein Transport / genetics Proteins / metabolism
C.elegans tm3038 tm324