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BGI develops new strategy to uncover structural variations of human genomes
Date:7/25/2011

enotypes previously difficult to define by other approaches.

Through this new method, researchers identified 277,243 SVs, ranging from 1bp to 23kbp in assembled regions of both genomes. Meanwhile, the researchers performed validation using computational and experimental methods and the results indicated a high accuracy of detection. They also carried out characterization of genome-wide patterns of these SVs on different genomic features and studied their potential biological impacts. Profiling using 106 individuals of the 1000 Genomes Project indicates that the extent of diversity in SVs between individuals exceeds that of SNPs. These findings demonstrate whole genome de novo assembly could serve as a new solution to a more comprehensive SV map.

"Here we provide a new method, at a relatively low cost and high speed, to establish in greater detail the presence and patterns of SVs in different genomes, and the results have a high accuracy and a wider range of length spectrum coverage in comparison with previous methods," said Honglong Wu, bioinformatician at BGI and one senior author of the study.

Furthermore, researchers reported, SVs are more individual-specific than SNPs, which may play a significant role underlying the phenotypic differences between individuals. "This study makes us understand we need to consider all kinds of genetic variations and potential differences in their impacts on disease and various other phenotypes in medical genomics studies in the future." added Yingrui Li.

Professor Jun Wang, Executive Director of BGI, said, "With further progresses in de novo assembling by new technologies, assembly-based approaches will be of greater importance and potentially an ultimate solution to SV determination. The study of SVs is likely to attract even more attention in the future."

This study also reveals that de novo assembly can develop more complete personal genomes than resequencing based mapping. Research
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Contact: Lei Su
BGI-Marketing@genomics.cn
86-075-525-283-805
Beijing Genomics Institute
Source:Eurekalert

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