Meiosis-specific telomere-associated protein involved in meiotic telomere attachment to the nucleus inner membrane, a crucial step for homologous pairing and synapsis. Component of the MAJIN-TERB1-TERB2 complex, which promotes telomere cap exchange by mediating attachment of telomeric DNA to the inner nuclear membrane and replacement of the protective cap of telomeric chromosomes: in early meiosis, the MAJIN-TERB1-TERB2 complex associates with telomeric DNA and the shelterin/telosome complex. During prophase, the complex matures and promotes release of the shelterin/telosome complex from telomeric DNA. In the complex, MAJIN acts as the anchoring subunit to the nucleus inner membrane. MAJIN shows DNA-binding activity, possibly for the stabilization of telomere attachment on the nucleus inner membrane. Component of the MAJIN-TERB1-TERB2 complex, composed of MAJIN, TERB1 and TERB2. Localizes to telomeres throughout meiotic prophase I and disappears in metaphase I. In leptotene spermatocytes, localizes to telomeres that localize to the nucleus inner membrane. Specifically expressed in germline tissues. Mice develop normally, exhibit no overt phenotype, but are infertile (both males and females). Gonads are characterized by the absence of post-meiotic cells. Impaired localization of Terb1 and Terb2 to the nucleus inner membrane. MAJIN was named after the 'genie in Aladdin's lamp' in Japanese. Belongs to the MAJIN family.