ALK基因编码一种受体酪氨酸激酶(eceptor tyrosine kinase ,RTK),为跨膜蛋白,属于胰岛素受体超家族,在大脑发育与及特定的神经元中起重要作用。最初在间变性大细胞淋巴瘤(anaplastic large cell lymphoma, ALCL)发现ALK-NPM1融合蛋白,目前已在其它肿瘤中包括神经母细胞瘤和非小细胞肺癌,发现该基因出现突变、扩增或者重排,其中染色体重排最为常见,导致ALK与其他基因产生融合,包括ALK(2号染色体)/EML4(2号染色体),ALK / RANBP2(2号染色体),ALK /ATIC(2号染色体),ALK / TFG(3号染色体),ALK / NPM1(5号染色体),ALK / SQSTM1(5号染色体),ALK / KIF5B(10号染色体),ALK / CLTC(17号染色体),ALK / TPM4(19号染色体),和ALK / MSN(X染色体)。
T(2;17)(p23;q23)易位导致CLTC-ALK融合蛋白,这是弥漫性大B细胞淋巴瘤(dlbcl)中最常见的ALK融合蛋白。ALK重排DLBCL对CHOP化疗的反应较低。临床前研究表明,在细胞系和小鼠模型中,CLTC-ALK-DLBCL对ALK抑制有反应,两个病例研究表明,当重度预处理和晚期ALK阳性的DLBCL用环唑替尼治疗时,反应短暂,随后进展(一例为CLTC-ALK,一例为未知的ALK融合)。
The t(2;17)(p23;q23) translocation results in the CLTC-ALK fusion protein, the most common ALK fusion observed in diffuse large B cell lymphoma (DLBCL). ALK-rearranged DLBCL is less responsive to CHOP chemotherapy. Preclinical work indicates that CLTC-ALK DLBCL is responsive to ALK inhibition in cell lines and mouse models, and two case studies show short response followed by progression when heavily pretreated and advanced ALK-positive DLBCL is treated with crizotinib (one case CLTC-ALK, one case an unknown ALK fusion).
| Chr. | Start | Stop | Ref. s | Var. Bases |
| 17 | 57697219 | 57768072 | C | T |
| Transcript | ||||
| ENST00000269122.3 | ||||
| Chr. | Start | Stop | Transcript |
| 2 | 29415640 | 29446394 | ENST00000389048.3 |