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. 1996 Jul 15;24(14):2807–2812. doi: 10.1093/nar/24.14.2807

Sequence analysis and characterization of stutter products at the tetranucleotide repeat locus vWA.

P S Walsh 1, N J Fildes 1, R Reynolds 1
PMCID: PMC146018  PMID: 8759015

Abstract

The PCR amplification of tetranucleotide short tandem repeat (STR) loci typically produces a minor product band 4 bp shorter than the corresponding main allele band; this is referred to as the stutter band. Sequence analysis of the main and stutter bands for two sample alleles of the STR locus vWA reveals that the stutter band lacks one repeat unit relative to the main allele. Sequencing results also indicate that the number and location of the different 4 bp repeat units vary between samples containing a typical verses low proportion of stutter product. The results also suggest that the proportion of stutter product relative to the main allele increases as the number of uninterrupted core repeat units increases. The sequence analysis and results obtained using various DNA polymerases appear to support the slipped strand displacement model as a potential explanation for how these stutter products are generated.

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Selected References

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