A partial genomic DNA library of Chlamydomonas reinhardtii was screened with an (AC)11 probe for the presence of (CA/GT)n simple sequence repeats (SSRs). Based on the frequency of these repeats in the partial genomic library, we estimate that (CA/GT)n repeats occur at a rate of about one every 17.7 kb in the C. reinhardtii genome. Ten positive clones were sequenced and four polymerase chain reaction (PCR) primer sets flanking (CA/GT)n sequences were constructed for four loci. The PCR was used to specifically amplify these regions from multiple isolates of C. reinhardtii. All four loci were highly polymorphic in the C. reinhardtii isolates. A simple Mendelian inheritance pattern was found for all four loci, which showed 2:2 segregation in the tetrads resulting from a cross between C. reinhardtii and C. smithii. Our results suggest that these simple sequence repeat DNA loci will be useful for identity testing, population studies, linkage analysis, and genome mapping in Chlamydomonas.
Plant Molecular Biology – Springer Journals
Published: Sep 30, 2004
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