Enrichment of meiotic recombination hotspot sequences by avidin capture technology

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• 作者：Daniel Camara Teixeira ; Sridhar A. Malkaram¹ ; Janos Zempleni ; ^{jzempleni2@unl.edu}
• 关键词：bp ; basepair ; EDTA ; ethylenediaminetetraacetic acid ; EHMT1 ; eukaryotic histone methyl transferase ; FAM ; fluorescein amidite ; H3K4me3 ; histone H3 ; trimethylated at lysine9 ; HLCS ; holocarboxylase synthetase ; K ; lysine ; kb ; kilo bases ; LTR ; long terminal rep
• 刊名：Gene
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：516
• 期：1
• 页码：101-106
• 全文大小：694 K

文摘

About 40 % of the hotspots for meiotic recombination contain the degenerate consensus sequence 5¡ä-CCNCCNTNNCCNC-3¡ä. Here we present a novel protocol for enriching hotspot sequences from digested genomic DNA by using biotinylated oligonucleotides and streptavidin-coated magnetic beads. The captured hotspots can be released by simple digestion with restriction enzymes for subsequent characterization by second generation sequencing or PCR. The capture protocol specifically enriches hotspot sequences, judged by using fluorophore-conjugated synthetic oligonucleotides and synthetic double-stranded oligonucleotides in combination with PCR. The capture protocol enriches single-stranded DNA, denatured double-stranded DNA, and large fragments (> 3000 bp) of digested plasmid DNA with good efficacy. No false positive and false negatives were detected when enriching digested DNA from human cell cultures and primary human cells. The protocol can probably be adapted to enriching sequences other than the hotspot sequence by altering the sequence in the capture oligonucleotide. We intend to apply this protocol in studies assessing effects of micronutrient status on meiotic recombination events in human sperm.