AFF1（AF4/FMR2 family member 1），癌症关联基因，基因ID：4299，该基因编码与脆性X E综合征（FRAXE）家族相关的AF4/淋巴样核蛋白的成员，其与人类儿童淋巴母细胞白血病、脆性X染色体智力残疾和共济失调有关。它是与自发性急性淋巴细胞白血病相关的流行性混合系白血病融合基因这个家族的成员有三个保守的结构域：n端同源结构域、af4/淋巴核蛋白结构域和c端同源结构域。该蛋白通过延伸和染色质重塑功能作为RNA聚合酶II介导的转录调控因子通过RNA干扰筛选，发现该基因能促进白血病细胞生存所需的质膜糖蛋白CD133的表达选择性剪接导致多个转录变体[由RefSeq提供，2017年7月]This gene encodes a member of the AF4/ lymphoid nuclear protein related to the Fragile X E syndrome (FRAXE) family of proteins， which have been implicated in human childhood lymphoblastic leukemia， fragile chromosome X intellectual disability， and ataxia. It is the prevalent mixed-lineage leukemia fusion gene associated with spontaneous acute lymphoblastic leukemia. Members of this family have three conserved domains: an N-terminal homology domain， an AF4/ lymphoid nuclear protein domain， and a C-terminal homology domain. The protein functions as a regulator of RNA polymerase II-mediated transcription through elongation and chromatin re。