CELE_C05D11.4, C05D11.4

let-756 encodes an fibroblast growth factor (FGF)-like ligand that is required for progression through early larval development; LET-756 is expressed from late embryogenesis to adulthood, with a peak of expression in larvae; with EGL-17, LET-756 is redundantly required to activate EGL-15/FGFR, which in turn activates protein degradation in adult muscle cells; homozygotes for partial loss-of-function alleles are small, clear, and scrawny, but viable, while those for a null allele arrest in early larval development.

CELE_K10D2.3, pup-1, cde-1, K10D2.3

cid-1 (also known as pup-1) encodes a template-independent poly(U) polymerase with 3'' end RNA substrates, orthologous to human ZCCHC6 and ZCCHC11, and paralogous to PUP-2; CID-1 prevents larvae from growing to adulthood in media containing hydroxyurea (HU, a drug that stalls replication forks) and represses HSP-4 expression; CID-1 is required for gonadogenesis, embryonic and vulval development, normally rapid growth, and normally short lifespan; CID-1, like HSP-4, is expressed in postmitotic intestinal cells; by orthology with Cid1p in fission yeast, CID-1 is predicted to act in a DNA synthesis-to-mitosis checkpoint; in cid-1(rf35::Tc4) mutants or cid-1(RNAi) animals grow from L1 larvae to adulthood despite the presence of HU, are abnormally resistant to lethal heat shock, overexpress hsp-4::GFP, have protruding vulvae, have abnormally short and thick gonads with fewer germ cells than normal, produce disorganized embryos, grow slowly, and have abnormally long lifespans; CID-1 and its eukaryotic homologs are distantly related to the GLD-2 family of poly(A) polymerases.