概括
科学家们在Saccharomyces cerevisiae中发现了一种酵母基因,该基因编码了一种与人类原型瘤基因相同的蛋白质. 这一发现有助于理解真核生物中保存的原型基因功能.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 原型瘤基因在细胞调节中至关重要,并且在真核生物体中得到保护.
- 在更简单的生物体中,基因分析可以阐明保存的蛋白质的功能.
- 德洛索菲拉黑菌和Saccharomyces cerevisiae是研究瘤基因同类物种的潜在模型生物.
研究的目的:
- 在酵母菌Saccharomyces cerevisiae中识别和描述原型瘤基因序列.
- 调查酵母衍生蛋白质和人类原型瘤基因产品之间的同质性.
- 在模型真核生物中探索保存的原型基因元素的潜在功能.
主要方法:
- 选Saccharomyces cerevisiaeDNA,以寻找与脊椎动物瘤基因相同的序列.
- 在酵母中的基因识别和测序.
- 蛋白质同质性分析比较酵母衍生蛋白与人类p21原生基因产品.
- 在酵母基因组中的基因映射和表达分析.
主要成果:
- 鉴定了一种编码206个氨基酸蛋白的Saccharomyces cerevisiae基因 (YP2).
- YP2蛋白与人类c-has/bas原型瘤基因p21产物和病毒ras蛋白 (v-rasH,v-rasK) 有着惊人的相似之处.
- YP2基因位于第六染色体上,位于actin和tubulin基因之间,在成长中的细胞中得到表达.
结论:
- 麦芽菌具有与真核原生基因同源的基因,这表明功能保留.
- 已识别的酵母蛋白 (YP2) 可能与人类的p21蛋白具有功能上的相似性,例如核酸结合能力.
- 这一发现支持使用酵母作为研究保存原型瘤基因功能的模型系统.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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