Biotechnology Bulletin ›› 2020, Vol. 36 ›› Issue (7): 220-227.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0935

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An Improved Method for Large Size DNA Recovery Facilitates Fosmid Library Preparation

ZHANG Cui-cui1, ZHAO Sheng2, WANG Yue1,2, ZHANG Peng1,2, CHANG Yu-xiao2   

  1. 1. College of Life Science and Technology,Guangxi University,Nanning 530004;
    2. Agricultural Genomics Institute at Shenzhen,Chinese Academy of Agricultural Sciences,Shenzhen 518120
  • Received:2019-10-01 Online:2020-07-26 Published:2020-07-28

Abstract: The Fosmid library with inserted DNA of around 40 kb has been widely used in genomics research. However,the traditional method of agarose gel separation and electroelution into dialysis bag has long been used for large DNA fragment isolation,which makes it difficult to obtain sufficient amount of DNA fragments for ligation,thus dramatically reduces the success rate in Fosmid library preparation. In this study,a simple,convenient and efficient method for 40 kb DNA fragments recovery was established exploiting a modified program on SageELF,a fully automated nucleic acid / protein recovery system. The method was used to prepare Fosmid libraries with improved quality successfully. Through Sanger sequencing and restriction fragment analysis of 25 random selected Fosmid clones,we found the size of the inserted DNA was 37.9 ± 5.2 kb. These results showed that,our improved method could recover 40 kb DNA accurately,simply and efficiently;In addition,the inserts of the Fosmid library constructed with the recovered 40 kb DNA were more concentrated,which will facilitate the following genomics analysis.

Key words: fosmid library, large size DNA recovery, dialysis bag