ZNFX-1 defines Z granules, liquid-like condensates distinct from P granules

ZNFX-1 and WAGO-4 act cooperatively for transgenerational siRNA inheritance

Z granules form tri-condensate PZM assemblages with P granules and Mutator foci

ZNFX-1 is a dedicated RNAi inheritance factor

ZNFX-1 is a conserved RNA helicase in small RNA pathways

ZNFX-1 interacts with Argonaute systems

ZNFX-1 prevents spread of epigenetic signals toward 5'-end of target mRNAs

Z granules are subdomains of nuage named for ZNFX-1

ZNFX-1 forms condensates closely apposed to the P granule protein PGL-1 and to Mutator foci (MUT-16), and is found in close proximity to DEPS-1 clusters (i.e. ZNFX-1 occupies a Z-granule compartment adjacent to, not within, P granules in the adult germline)

ZNFX-1 acts in a cytoplasmic/perinuclear small RNA amplification loop (parallel to the nuclear HRDE-1 loop) that targets mature transcripts and concentrates them in perinuclear condensates

ZNFX-1 binds small-RNA-targeted transcripts bearing poly(UG) (pUG) tails and is required to sustain pUGylation and robust small RNA amplification in the inheriting generation

ZNFX-1 is required for nucleus-independent (cytoplasm-only) RNAi inheritance, confirming its role in a cytoplasmic inheritance pathway distinct from nuclear chromatin-based inheritance

ZNFX-1 is a UPF1-like superfamily-1 (SF1) RNA helicase / NTPase-like regulatory factor with six cysteine-rich NF-X1-like motifs that acts in perinuclear condensates to enable amplification, patterning and persistence of small-RNA-guided silencing across generations, rather than catalyzing a classical metabolic reaction.

ZNFX-1 binds small-RNA-targeted transcripts bearing poly(UG) (pUG) tails and is required to maintain pUGylation and concentrate targeted mature RNAs in perinuclear condensates, preserving templates for continued amplification in inheriting generations.

ZNFX-1 physically associates with the germline RdRP EGO-1 and Argonautes CSR-1, WAGO-1 and PRG-1; the ZNFX-1:EGO-1 interaction is RNase-resistant (RNA-independent).

ZNFX-1 helps position RdRP to favor 3' recruitment and balanced 22G-RNA synthesis along transcripts; loss of ZNFX-1 mispatterns 22G-RNAs toward 5' ends of mRNAs.

ZNFX-1 acts in a cytoplasmic/perinuclear amplification loop parallel to nuclear HRDE-1, with HRDE-1 targeting nascent transcripts and ZNFX-1 targeting mature transcripts in nuage and maintaining pUGylated RNAs for tertiary 22G-RNA amplification.

In early embryos ZNFX-1 and WAGO-4 localize with P granules then demix to form an independent liquid-like Z-granule condensate, later assembling into ordered PZM tri-condensate structures with P granules and Mutator foci.

znfx-1 mutants show normal immediate RNAi but fail to transmit silencing to progeny and are specifically defective in cytoplasm-only inheritance (viability ~6.87% vs ~85% in controls), consistent with a maintenance/amplification role.