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. 2024 Mar 28;15:2727. doi: 10.1038/s41467-024-46882-9

Fig. 6. Reduced CK2 activity in the aging process underlies piRNA mediated gene silencing defects.

Fig. 6

a Subcellular localization of GFP::KIN-3 in wide type Day 1 and wild type Day 7 worms. n. Total number of animals scored. b The activity of CK2 to phosphorylate purified TOFU-4 peptide is decreased in the aging process. Lysates from wide type Day 1 and wild type Day 7 worms of adulthood were used in in vitro phosphorylation assays. The relative activity of CK2 from wide type Day 1worms is set to 1.0. Data is shown as mean ± SD. n = 3 independent biological replicates. Compared to wild type Day 1 worms, the nuclear foci of USTC factors GFP::TOFU-4 (c) and mCHERRY::PRDE-1 (d) in wild type Day 7 worms disappear. n. Total number of animals scored. e GFP::PRG-1 becomes diffused in wild type Day 7 worms compared to those of wild type Day 1 worms. n. Total number of animals scored. f Immunoblotting assays revealed that protein levels of GFP::PRG-1 are decreased in extracts of wild type Day 7 worms compared to those of wild type Day 1 worms. One representative out of 3 independent experiments is shown. g Bar diagram displaying piRNAs mapping perfectly to known C. elegans piRNA loci in wild type Day 1 and wild type Day 7 worms. h Bar diagram displaying the number of piRNA precursors mapping to piRNA sequences in wild type Day 1 and wild type Day 7 worms. Small RNAs are pretreated with 5’ Pyrophosphohydrolase (RppH, NEB). i Percentage of worms with expressed piRNA sensors in wide type Day 1 and wild type Day 7 worms. n. Total number of animals scored. j Western results of GFP::CSR-1 protein levels in wide type Day 1 and wild type Day 7 worms. One representative out of 3 independent experiments is shown. k qRT–PCR of turmoil1 and line2h transposon levels in wide type Day 1 and wild type Day 7 worms relative to act-3 mRNA are displayed. mRNA level in wild type worms is set to 1.0. Data is shown as mean ± SD. n = 4 independent biological replicates; p values from two-tailed Student’s t test. **p < 0.01. Scale bars: 20 μm (a and ce), 50 μm for i and 10 μm (insets in a). Source data are provided as a Source Data file.