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Studying DNA and RNA
Gene Chips for Comparing Cell Activity
Description
DNA microarrays are gene chips used to compare gene activity in different conditions. They are high-throughput assays, which means they can analyze large amounts of data at once. They are also relatively inexpensive and can be automated, making them useful for genome-wide studies.
These chips are...
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Transcript
DNA 微阵列包含数千条单链 DNA 探针,这些探针以网格形式排列在玻璃或硅芯片上。待检测的 DNA 经荧光标记后,可与微阵列上互补的探针发生杂交。
该技术可同时测定特定 cDNA 序列的相对浓度。
通常,DNA 微阵列通过检测与特定 mRNA 转录本相对应的 cDNA 水平来定量基因表达。
其他用途包括检测转录因子在染色质上的结合,或鉴定基因组DNA中的单核苷酸变异。
用于检测 mRNA 的微阵列探针是单链 DNA 片段,对应于待分析的每个基因的编码区。探针的核苷酸可以通过 PCR 从基因组 DNA 中复制获得, 也可以直接合成在芯片表面。
这些探针共价结合在芯片上,形成点阵,每个位点代表一个单一靶标。因此,一张D...
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