Abstract
Silver-stained random amplified polymorphic DNA (ssRAPD) markers have been identified that are always jointly present or absent in the ssRAPD profiles of cranberry varieties. On the basis of segregation data and the ability to re-create these “associated ssRAPDs” through the intermixing of amplified DNA from individuals lacking them, five of the six pairs of associated ssRAPDs analyzed were shown to be consistent with heteroduplex molecules. Heteroduplexes are “hybrid”” double-stranded DNAs that are formed following the polymerase chain reaction (PCR) amplification of two DNA segments that have a high degree of homology to one another, yet differ in their nucleotide sequences as a result of base pair deletions, additions, or substitutions. Three of the five putative heteroduplex systems identified are consistent with a one locus, two-allele heteroduplex model. The remaining two systems appeared to be multi-allelic, involving interactions among three and four alleles, respectively. RAPD heteroduplex formation has the potential to confound genetic relatedness and pedigree studies. Heterozygous individuals exhibit heteroduplex RAPDs not seen in either of the two homozygote classes. Genetic estimates under such a circumstance would “inflate” the differences between the heterozygote and the homozygote classes. Heteroduplex formation is also a mechanism for the presence of non-parental RAPDs in progeny of parents homozygous for alternate alleles. While this class of molecular markers can confound RAPD analyses, they also offer a source of co-dominant RAPD markers, which are of value in genetic relatedness estimates and as markers for studying breeding behavior.
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Communicated by G. E. Hart
Supported by State and U.S. Federal funds, CSRS grant 93-34155-8382, and Ocean Spray Cranberries, Inc.
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Novy, R.G., Vorsa, N. Evidence for RAPD heteroduplex formation in cranberry: implications for pedigree and genetic-relatedness studies and a source of co-dominant RAPD markers. Theoret. Appl. Genetics 92, 840–849 (1996). https://doi.org/10.1007/BF00221896
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DOI: https://doi.org/10.1007/BF00221896