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Index >> Microbes and Lithosphere >> Molecular Techniques for Analysis of Soil Microbial Communities

Molecular Techniques for Analysis of Soil Microbial Communities

Molecular techniques for analysis of soil microbial communities
Molecular techniques have recognised the limitations of culture-based
approaches (lack of universal media for analysing microbial populations).

Molecular techniques circumvent these shortcomings by targeting molecules that serve as markers of a particular type of microbe, and which can be recovered or assayed without having to culture the microbes.

Many types of molecular techniques that have been applied to for the analysis of soil microbial populations including cell membrane components (fatty acids), cell surface components (proteins/ carbohydrates exposed on the surface of the cell) and nucleic acids (DNA and RNA). The latter have been the focus of the greatest attention.

Approaches for utilisation of nucleic acid analysis
a. Types of information obtained from nucleic acid analysis

Because DNA, mRNA and rRNA have different roles, their analysis provides different kinds of information about organisms and their activity.

Genes (DNA) may be analysed by "probes" to provide information on the presence of a specific function in microbial populations.

Determining amounts of specific mRNA present might allow activation (expression) of specific genes to be followed.

rRNA analysis can allow identities of organisms in a population to be determined (the molecular clock aspect).

It will focus on DNA and rRNA analysis. Recovery of mRNA from soil microbial populations has special problems that make it at present relatively uncommon.

b. Recovery and use of nucleic acids to investigate soil microbial communities

There are three phases in the molecular techniques applied to soil samples:
i. nucleic acid extraction
ii. extract purification
iii. extract analysis

 

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