African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5210

Full Length Research Paper

Isolation of DNA from saltern soils collected in Taiwan and whole-genome amplification of minute amounts of DNA for construction of metagenomic libraries

Shie-Jea Lin, Hsuen-Chun Liao, Tzu-Jun Liu and Wen-Shen Chu*
Food Industry Research and Development Institute, Hsinchu 30062, Taiwan, Republic of China.
Email: [email protected]

  •  Accepted: 30 November 2012
  •  Published: 04 June 2013


Environmental DNAs from 21 samples of saltern soil in Taiwan were isolated by using the SDS-lysis method, resulting in yields ranging from 0.03 ng to 8.06 µg per gram of soil. However, sample 143 collected from saltern soil near a crystallizer had a low yield of 1.2 ng per gram of soil. Comparative analyses of the sequence data of representative clones with other 16S rRNA samples indicated that not all clones for sample 143 were closely related to the soil bacteria. A minute amount of DNA (0.15 ng) was amplified 100,000-times to 15 µg by multiple displacement amplification (MDA). The MDA method was validated by analysis of amplified bacteriorhodopsin (bR) genes. Two clone libraries were constructed from DNA samples before and after amplification and were compared. The result suggests that bR diversity was relatively conserved during whole-genome amplification (WGA). The constructed metagenome fosmid library consists of 1.7 × 106clones with an average insert size of 26.1 kb. Taken together, WGA of metagenomic DNA from very minute microbial sources allows for construction of metagenomic libraries that are previously inaccessible.


Key words: Saltern soil, DNA extraction, metagenomic DNA, multiple displacement amplification, fosmid library construction.