Protein adapter involved in piRNA-directed transposon methylation by connecting PIWIL4-piRNA and DNA methylation machineries. The PIWIL4-piRNA pathway plays a central role during spermatogenesis by directing transposon DNA methylation and silencing, thereby preventing their mobilization, which is essential for the germline integrity. . This is the function of ENSG00000262874 (C19orf84, chromosome 19 open reading frame 84).