Point mutation in essential genes with loss or mutation of the second allele: relevance to the retention of tumor-specific antigens.

Point mutation in essential genes with loss or mutation of the second allele: relevance to the retention of tumor-specific antigens.
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DOI:
10.1084/jem.194.3.285
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发表时间:
2001-08-06
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Schreiber H
Schreiber H
中科院分区:
其他
文献类型:
--
作者:
Beck-Engeser GB;Monach PA;Mumberg D;Yang F;Wanderling S;Schreiber K;Espinosa R 3rd;Le Beau MM;Meredith SC;Schreiber H

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尽管肿瘤进展,但仍被肿瘤细胞保留的肿瘤特异性抗原为免疫和可能的其他治疗干预提供了稳定和特异性靶点。因此,我们研究了两种CD 4 + T细胞识别的肿瘤特异性抗原,这些抗原在两种紫外线诱导的小鼠癌症向更具侵袭性生长的演变过程中保留。抗原是通过体细胞肿瘤特异性点突变改变的核糖体蛋白,并且进展因子(PRO)变体缺乏相应的正常等位基因。在第一个肿瘤6132 A-PRO中,抗原由点突变的L9核糖体蛋白基因编码。肿瘤缺乏正常的L9等位基因,因为5号染色体的间质缺失。在第二个肿瘤6139 B-PRO中,L26基因的两个等位基因都具有点突变,并且每个等位基因编码不同的肿瘤特异性CD 4 + T细胞识别抗原。因此,对于L9和L26基因,我们观察到抑制肿瘤生长的基因中常见的“两次击中”动力学。事实上,将丢失的野生型L9等位基因重新引入6132 A-PRO变体中抑制了体内肿瘤细胞的生长。由于L9和L26都编码核糖体生物发生所必需的蛋白质,因此在不存在正常等位基因的情况下肿瘤特异性靶抗原的完全丧失将消除肿瘤生长。
Antigens that are tumor specific yet retained by tumor cells despite tumor progression offer stable and specific targets for immunologic and possibly other therapeutic interventions. Therefore, we have studied two CD4+ T cell–recognized tumor-specific antigens that were retained during evolution of two ultraviolet-light–induced murine cancers to more aggressive growth. The antigens are ribosomal proteins altered by somatic tumor-specific point mutations, and the progressor (PRO) variants lack the corresponding normal alleles. In the first tumor, 6132A-PRO, the antigen is encoded by a point-mutated L9 ribosomal protein gene. The tumor lacks the normal L9 allele because of an interstitial deletion from chromosome 5. In the second tumor, 6139B-PRO, both alleles of the L26 gene have point mutations, and each encodes a different tumor-specific CD4+ T cell–recognized antigen. Thus, for both L9 and L26 genes, we observe “two hit” kinetics commonly observed in genes suppressing tumor growth. Indeed, reintroduction of the lost wild-type L9 allele into the 6132A-PRO variant suppressed the growth of the tumor cells in vivo. Since both L9 and L26 encode proteins essential for ribosomal biogenesis, complete loss of the tumor-specific target antigens in the absence of a normal allele would abrogate tumor growth.
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