Barley haplotyping using biplex deoxyribozyme nanomachine

Abstract

Direct sequencing is the gold standard for genome haplotyping, while PCR is used for detection of limited number of genetic variations. However, these methods are not suitable for fast low-cost in-field testing of plant specimens. Here, we developed a two-color florescent nanosensor system (named here biplex deoxyribozyme nanomachine or bixDNM) that can haplotype dsDNA amplicons. The sensor is based on fluorescent binary deoxyribozyme embedded in a nanostructure containing together four DNA binding arms. Two allele specific sensors were tailored for producing signals at two different wavelengths (525 and 662 nM) only in the presence of fully matched analytes. Accurate haplotyping of seven barley samples was achieved. This is the first technique showing detected of both short (146 bp) and long (1348 bp) dsDNA amplicons with single nucleotide specificity. The study demonstrated bixDNM can become a foundation for future development of a plant haplotyping technology that can be used in field or at the low resource agricultural settings.

Keywords

• Split probes
• Crop haplotyping
• Detection of dsDNA
• SNV selectivity
• binary probe
• DNA machine