Extraction of High-quality Genomic DNA from Different Plant Orders Applying a Modified CTAB-Based Method | Chapter 07 | Modern Research in Botany Vol. 1
Background:
Reliable measurement of DNA concentration and purity is important for almost
all molecular genetics studies. Different plant species have varying levels of
polysaccharides, polyphenols and other secondary metabolites which combine with
nucleic acids during DNA isolation and further affect the quality of the
extracted DNA. The current extraction protocol is based-upon the conventional
CTAB method with further modifications for the extraction of DNA from variable
plant seeds and crops belong to seven different orders The principle
modifications currently employed for DNA extraction involved the use of higher
CTAB concentration and higher levels of β-Mercaptoethanol. Additionally, higher
concentrations of sodium chloride and potassium acetate were added simultaneously
with absolute ice cold isopropanol for the precipitation of DNA free from
polysaccharides.
Results and Conclusion: The
prescribed modifications in the present method establish a quick and efficient
standardized protocol for DNA extraction from different plant orders. The
current extraction protocol, therefore, can be of great value for molecular
analysis involving large numbers of different plant samples from different
orders. These modifications consistently produced pure and high quality DNA suitable
for further molecular analysis. Successful PCR amplification with RAPD primer,
the complete digestion of the isolated DNA with the HindIII restriction enzyme
and amplification of nptII gene applying both conventional and real-time PCR
(RT-PCR) in presence of SYBR Green 1 dye pursued by the analysis of melting
curve analysis validated the quality of the isolated DNA. Moreover, it reflects
the efficiency of the protocol and proves its suitability for further
applications for the assessment of food safety, detection of genetically
modified (GM) crops and conservation of biodiversity.
Author(s) Details
Dr. Nadia Aboul-Ftooh
Aboul-Maaty
Department of Cell Biology,
Genetic Engineering and Biotechnology Research Division, National Research
Centre, Dokki, Cairo, Egypt.
Professor Hanaa Abdel-Sadek
Oraby
Department of Cell Biology,
Genetic Engineering and Biotechnology Research Division, National Research
Centre, Dokki, Cairo, Egypt.
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