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BigH1 | Histone H1 variant BigH1 (BigH1) encodes a germline linker histone H1 variant that is retained in the early embryo until cellularization. It is required for gametogenesis and to maintain silencing of the zygotic genome during early embryogenesis. (353 aa) | ||||
Upf1 | Regulator of nonsense transcripts 1 homolog; RNA-dependent helicase and ATPase required for nonsense- mediated decay (NMD) of mRNAs containing premature stop codons. Is recruited to mRNAs upon translation termination and undergoes a cycle of phosphorylation and dephosphorylation; its phosphorylation appears to be a key step in NMD. The formation of an Upf1-Upf2-Upf3 surveillance complex is believed to activate NMD (By similarity). (1180 aa) |