Multi-ethnic cytochrome-P450 copy number profiling: novel pharmacogenetic alleles and mechanism of copy number variation formation.

Multi-ethnic cytochrome-P450 copy number profiling: novel pharmacogenetic alleles and mechanism of copy number variation formation.
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DOI:
10.1038/tpj.2012.48
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发表时间:
2013-12
期刊:
The pharmacogenomics journal
影响因子:
--
通讯作者:
Scott SA
Scott SA
中科院分区:
其他
文献类型:
--
作者:
Martis S;Mei H;Vijzelaar R;Edelmann L;Desnick RJ;Scott SA

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为了确定CYP 450拷贝数变异(CNV)在CYP 2D 6以外的作用,通过MLPA和qPCR在542名非洲裔美国人、亚洲人、高加索人、西班牙人和德系犹太人中询问了11个CYP 450基因。在这些人群中,CYP 2A 6、CYP 2B 6和CYP 2 E1合并的缺失/重复等位基因频率范围为2%至10%。基于高分辨率微阵列的比较基因组杂交(aCGH)将CYP 2A 6、CYP 2B 6和CYP 2 E1断点定位于直接定向的低拷贝重复序列。测序将CYP 2B 6断裂点定位于与CYP 2B 7 P1具有高度同源性的529 bp内含子4区域,导致CYP 2B 6 *29部分缺失等位基因和互补的新型CYP 2B 6/2B 7 P1重复融合等位基因(CYP 2B 6 *30)。总之,这些数据确定了新的CYP 450 CNV等位基因(CYP 2B 6 *30和CYP 2 E1 * 1Cx 2),并表明常见的CYP 450 CNV形成可能是由非等位基因同源重组介导的,导致全基因和基因融合拷贝数失衡。当询问这些基因用于药物遗传学药物选择和给药时,应考虑这些CNV的检测。
To determine the role of CYP450 copy number variation (CNV) beyond CYP2D6, 11 CYP450 genes were interrogated by MLPA and qPCR in 542 African-American, Asian, Caucasian, Hispanic, and Ashkenazi Jewish individuals. The CYP2A6, CYP2B6 and CYP2E1 combined deletion/duplication allele frequencies ranged from 2% to 10% in these populations. High-resolution microarray-based comparative genomic hybridization (aCGH) localized CYP2A6, CYP2B6 and CYP2E1 breakpoints to directly-oriented low-copy repeats. Sequencing localized the CYP2B6 breakpoint to a 529 bp intron 4 region with high homology to CYP2B7P1, resulting in the CYP2B6*29 partial deletion allele and the reciprocal, and novel, CYP2B6/2B7P1 duplicated fusion allele (CYP2B6*30). Together, these data identified novel CYP450 CNV alleles (CYP2B6*30 and CYP2E1*1Cx2) and indicate that common CYP450 CNV formation is likely mediated by non-allelic homologous recombination resulting in both full gene and gene-fusion copy number imbalances. Detection of these CNVs should be considered when interrogating these genes for pharmacogenetic drug selection and dosing.
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