Enables RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in negative regulation of distal tip cell migration; regulation of developmental process; and regulation of transcription by RNA polymerase II. Located in cytoplasm and nucleus. Expressed in several structures, including distal tip cell; dorsal nerve cord; enteric muscle; neurons; and tail hypodermis. Human ortholog(s) of this gene implicated in gastrointestinal system cancer (multiple); lung adenocarcinoma; and non-Hodgkin lymphoma (multiple). Is an ortholog of human PRDM1 (PR/SET domain 1).