Enables DNA-binding transcription activator activity; chromatin binding activity; and transcription cis-regulatory region binding activity. Involved in histone H3-K4 methylation. Acts upstream of or within several processes, including osteoblast development; positive regulation of macromolecule metabolic process; and regulation of osteoblast differentiation. Located in chromosome, telomeric region; cytoplasm; and nucleus. Is expressed in several structures, including 1st branchial arch; alimentary system; central nervous system; gonad; and sensory organ. Used to study growth hormone secreting pituitary adenoma; hyperparathyroidism; multiple endocrine neoplasia type 1; and prolactinoma. Human ortholog(s) of this gene implicated in endocrine gland cancer (multiple); hyperparathyroidism; and multiple endocrine neoplasia type 1. Orthologous to human MEN1 (menin 1). [provided by Alliance of Genome Resources, Apr 2022]