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Abstract The crawling motility of nematode sperm is driven by the unconventional cytoskeletal protein, Major Sperm Protein (MSP). In developing spermatocytes, MSP assembles on the cytosolic side of Golgi-derived membranous organelles (MOs) in structures called Fibrous Bodies (FBs). These MSP-laden FB-MO complexes facilitate the subsequent segregation of MSP to budding spermatids and away from central residual bodies. Here we identify SPE-55 as a key FB assembly factor.
Abstract The mammalian PAS-domain protein PERIOD (PER) and its C. elegans orthologue LIN-42 were proposed to constitute an evolutionary link between two distinct, circadian and developmental, timing systems. However, while the function of PER in animal circadian clocks is well understood molecularly and mechanistically, this is not true for LIN-42's function in timing rhythmic development.
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