該基因編碼一個融合蛋白，該蛋白包含一個N-末端組蛋白賴氨酸N-甲基轉移酶結構域和一個C-末端水手轉座酶結構域編碼蛋白與DNA結合，參與DNA的非同源末端連接和雙鏈斷裂修復該蛋白的集合結構域部分特異性地甲基化組蛋白H3賴氨酸4和36這種基因在靈長類動物中只作為一個融合基因存在，其他生物缺乏水手的領域。交替剪接導致多個轉錄變體。
This gene encodes a fusion protein that contains an N-terminal histone-lysine N-methyltransferase domain and a C-terminal mariner transposase domain. The encoded protein binds DNA and functions in DNA repair activities including non-homologous end joining and double strand break repair. The SET domain portion of this protein specifically methylates histone H3 lysines 4 and 36. This gene exists as a fusion gene only in anthropoid primates, other organisms lack mariner transposase domain. Alternate splicing results in multiple transcript variants.