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Biology

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Molecular Biology

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Studying DNA and RNA

FISH for Chromosome and Pathogen Detection

Description

FISH is a DNA and RNA detection method used in cytogenetics and medical testing. FISH stands for fluorescence in situ hybridization. It uses labeled probes that bind to complementary DNA or RNA sequences on a chromosome or inside a cell.

The method was developed in the early 1980s and became wide...

Transcript

荧光 原位 杂交或荧光原位杂交(FISH)是一种用于检测特定基因或基因片段在固定细胞染色体上位置的技术。

在此技术中,使用荧光标记的单链DNA作为探针,以结合染色体中含有互补DNA序列的区域,该区域被称为靶标。

首先,将细胞阻滞在间期或中期。将阻滞的细胞悬浮于缓冲液中,并涂布在洁净的玻璃载片上。

接下来,通过加热或化学方法使目标 DNA 和标记的探针变性。此步骤可使双链 DNA 解链,从而使探针和目标 DNA 均成为能够进行碱基配对的单链序列。

然后,将探针与目标DNA混合,并在夜间孵育。这使得探针能够与染色体上的互补序列杂交。

杂交完成后,洗去多余的探针。

如果探针用荧光染料标记,则...

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