핵산 추출 중에 RNA가 DNA보다 더 쉽게 분해되는 이유?

RNA를 사용하는 이유 (리보핵산) DNA보다 쉽게 ​​분해된다 (디옥시리보핵산) during 추출 is mainly related to their different chemical structures and improper operation during extraction.

나. Differences in chemical structure:

1. RNA is a single-stranded structure, which is more unstable than the double-stranded structure of DNA.

2. Hydroxyl at the 2′ position: The ribose in RNA molecules contains a hydroxyl group (-오) at the 2′ position, while the deoxyribose in DNA has a hydrogen atom at this position. This extra hydroxyl group makes the RNA molecule more unstable because it can promote spontaneous hydrolysis reactions, resulting in RNA chain breaks.

II. The influence of RNAse in the extraction system:

1. Endogenous RNAse: It exists in cells and can continue to degrade RNA even after cell lysis.

2. Exogenous RNAse: It is widely present in the environment, such as air, skin, and laboratory supplies (gloves, test tubes, 등.).

III. Improper experimental operation:

1. The reagents and instruments used have not been treated with DEPC (diethylpyrocarbonate) and cannot effectively inactivate RNA enzymes.

2. The inhibitor is ineffective, or the dosage is insufficient, and the activity of RNA enzymes cannot be effectively inhibited.

3. More experimental samples or higher homogenization temperatures lead to increased RNA enzyme activity.

4. Changes in pH and temperature, especially under alkaline conditions, can easily cause RNA bases to be deaminated, resulting in chain breaks; high temperatures can also cause partial or complete degradation of RNA molecules.

IV. What should be done to reduce RNA degradation？

In order to reduce RNA degradation during extraction, a series of measures need to be taken, including using RNAse-free laboratory supplies, operating at low temperatures, using RNA stabilizers, using finished kits, 등. These methods effectively reduce the risk of RNA degradation and ensure that high-quality RNA samples are obtained for downstream analysis.

공급업체 소개

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