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Exome sequencing and arrayCGH detection of gene sequence and copy number variation between ILS and ISS mouse strains

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Abstract

It has been well documented that genetic factors can influence predisposition to develop alcoholism. While the underlying genomic changes may be of several types, two of the most common and disease associated are copy number variations (CNVs) and sequence alterations of protein coding regions. The goal of this study was to identify CNVs and single-nucleotide polymorphisms that occur in gene coding regions that may play a role in influencing the risk of an individual developing alcoholism. Toward this end, two mouse strains were used that have been selectively bred based on their differential sensitivity to alcohol: the Inbred long sleep (ILS) and Inbred short sleep (ISS) mouse strains. Differences in initial response to alcohol have been linked to risk for alcoholism, and the ILS/ISS strains are used to investigate the genetics of initial sensitivity to alcohol. Array comparative genomic hybridization (arrayCGH) and exome sequencing were conducted to identify CNVs and gene coding sequence differences, respectively, between ILS and ISS mice. Mouse arrayCGH was performed using catalog Agilent 1 × 244 k mouse arrays. Subsequently, exome sequencing was carried out using an Illumina HiSeq 2000 instrument. ArrayCGH detected 74 CNVs that were strain-specific (38 ILS/36 ISS), including several ISS-specific deletions that contained genes implicated in brain function and neurotransmitter release. Among several interesting coding variations detected by exome sequencing was the gain of a premature stop codon in the alpha-amylase 2B (AMY2B) gene specifically in the ILS strain. In total, exome sequencing detected 2,597 and 1,768 strain-specific exonic gene variants in the ILS and ISS mice, respectively. This study represents the most comprehensive and detailed genomic comparison of ILS and ISS mouse strains to date. The two complementary genome-wide approaches identified strain-specific CNVs and gene coding sequence variations that should provide strong candidates to contribute to the alcohol-related phenotypic differences associated with these strains.

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Acknowledgments

NIAAA [2R01 AA011853 Genome variation underlying alcohol action (JMS), 3R01 AA011853-12S1 Genome variation underlying alcohol action (JMS), R01 AA016957 Genetic studies of alcohol tolerance (RAR)].

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Authors and Affiliations

  1. Department of Biochemistry and Molecular Genetics, University of Colorado Denver School of Medicine, Aurora, CO, 80045, USA

    Laura Dumas, Nathan Anderson, Jonathan Davis & James M. Sikela

  2. Department of Biology, University of Memphis, Memphis, TN, USA

    C. Michael Dickens

  3. Department of Pharmaceutical Sciences, University of Colorado Denver School of Medicine, Aurora, CO, 80045, USA

    Beth Bennett & Richard A. Radcliffe

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  1. Laura Dumas
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  2. C. Michael Dickens
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Correspondence to James M. Sikela.

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Dumas, L., Dickens, C.M., Anderson, N. et al. Exome sequencing and arrayCGH detection of gene sequence and copy number variation between ILS and ISS mouse strains. Mamm Genome 25, 235–243 (2014). https://doi.org/10.1007/s00335-014-9502-6

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