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Illumina Library Preparation for Sequencing the GC-Rich Fraction of Heterogeneous Genomic DNA.


ABSTRACT: Standard Illumina libraries are biased toward sequences of intermediate GC-content. This results in an underrepresentation of GC-rich regions in sequencing projects of genomes with heterogeneous base composition, such as mammals and birds. We developed a simple, cost-effective protocol to enrich sheared genomic DNA in its GC-rich fraction by subtracting AT-rich DNA. This was achieved by heating DNA up to 90?°C before applying Illumina library preparation. We tested the new approach on chicken DNA and found that heated DNA increased average coverage in the GC-richest chromosomes by a factor up to six. Using a Taq polymerase supposedly appropriate for PCR amplification of GC-rich sequences had a much weaker effect. Our protocol should greatly facilitate sequencing and resequencing of the GC-richest regions of heterogeneous genomes, in combination with standard short-read and long-read technologies.

SUBMITTER: Tilak MK 

PROVIDER: S-EPMC5808798 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Illumina Library Preparation for Sequencing the GC-Rich Fraction of Heterogeneous Genomic DNA.

Tilak Marie-Ka MK   Botero-Castro Fidel F   Galtier Nicolas N   Nabholz Benoit B  

Genome biology and evolution 20180201 2


Standard Illumina libraries are biased toward sequences of intermediate GC-content. This results in an underrepresentation of GC-rich regions in sequencing projects of genomes with heterogeneous base composition, such as mammals and birds. We developed a simple, cost-effective protocol to enrich sheared genomic DNA in its GC-rich fraction by subtracting AT-rich DNA. This was achieved by heating DNA up to 90 °C before applying Illumina library preparation. We tested the new approach on chicken DN  ...[more]

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