Abstract
A marker suitable for genetic mapping and genomic fingerprinting is characterized by high polymorphic information content (PIC) and high “multiplex ratio” (defined as the number of loci that can be simultaneously typed). Towards this goal, we combined an Alu-specific with a non-Alu primer in a single PCR amplification targeting genomic regions where length polymorphisms are abundant. Three loci were revealed with the variable number of (AAT), (TAAA), (AG), and/or (AAAGG) motifs, and PIC values between 0.7 and >0.94. Their location on Chromosomes (Chrs) 19q12, 17q12-q24, and 5q31.2–33.3 was determined by multipoint analysis with markers from CEPH database. The most common genotype for this three-locus marker, estimated from the occurrence of the most frequent alleles, is of the order of 2×10−4, while the combined PIC value of a single typing experiment is 2.37. The use of a similar primer pair, as well as examples from the literature, indicates the general nature of this approach when a non-Alu oligonucleotide, presumably with “random” priming sites downstream of Alu repeats, is combined with an Alu-specific one. Clustering of DNA length variants in the regions adjacent to interspersed repeats provides opportunity to develop other highly informative multiple-locus markers similar to that described here.
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Tang, J.Q., Korab-Laskowska, M., Jarnik, M. et al. Alu-PCR combined with non-Alu primers reveals multiple polymorphic loci. Mammalian Genome 6, 345–349 (1995). https://doi.org/10.1007/BF00364798
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DOI: https://doi.org/10.1007/BF00364798