Appears to function in the U7 snRNP complex that is involved in histone 3'-end processing. Increases U7 snRNA levels but not histone 3'-end pre-mRNA processing activity, when overexpressed. Required for cell cycle progression from G1 to S phases. Binds specifically to U7 snRNA. Binds to the downstream cleavage product (DCP) of histone pre- mRNA in a U7 snRNP dependent manner. . This is the function of LSM10 (LSM10, U7 small nuclear RNA associated, Ensembl gene identifier ENSG00000181817).