Artifactual pyrosequencing reads in multiple-displacement-amplified sediment metagenomes from the Red Sea

PeerJ

On On Lee¹  Yong Wang¹  Jiang Ke Yang¹  Pei Yuan Qian¹  Tie Gang Li² 

[1] Division of Life Science, Hong Kong University of Science and Technology, Hong Kong SAR, China;Institute of Oceanography, Chinese Academy of Science, Qingdao, China;

关键词: Gene fragments;    MDA;    Metagenome;    Artifactual 454 reads;   

DOI  :  10.7717/peerj.69

来源: DOAJ

【 摘 要 】

The Multiple Displacement Amplification (MDA) protocol is reported to introduce different artifacts into DNA samples with impurities. In this study, we report an artifactual effect of MDA with sediment DNA samples from a deep-sea brine basin in the Red Sea. In the metagenomes, we showed the presence of abundant artifactual 454 pyrosequencing reads over sizes of 50 to 220 bp. Gene fragments translocated from neighboring gene regions were identified in these reads. Occasionally, the translocation occurred between the gene fragments from different species. Reads containing these gene fragments could form a strong stem-loop structure. More than 60% of the artifactual reads could fit the structural models. MDA amplification is probably responsible for the massive generation of the artifactual reads with the secondary structure in the metagenomes. Possible sources of the translocations and structures are discussed.

【 授权许可】

Unknown