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. 2008 Nov;134(3):267-75.
doi: 10.1007/s10709-007-9234-6. Epub 2007 Nov 29.

Titration of repeat-induced point mutation (RIP) by chromosome segment duplications in Neurospora crassa

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Titration of repeat-induced point mutation (RIP) by chromosome segment duplications in Neurospora crassa

Parmit K Singh et al. Genetica. 2008 Nov.

Abstract

Repeat-induced point mutation (RIP) is a hypermutational process that alters duplicated DNA sequences in Neurospora crassa. In previous studies, five of six large ( > 100 kb) chromosome segment duplications (Dp's) examined were shown to dominantly suppress RIP in smaller (< 5 kb) duplications. The suppressor duplications were > 270 kb, whereas the lone non-suppressor duplication was approximately 117 kb. We have now screened another 33 duplications and found 29 more suppressors and four more non-suppressors. All 22 suppressor duplications whose size could be estimated were > 270 kb, whereas two newly identified non-suppressor duplications examined were 140-154 kb. RIP was suppressed in a subset of crosses heterozygous for more than one ordinarily non-suppressor duplication. These results strengthen the hypothesis that large duplications titrate out the RIP machinery and suggest the "equivalence point" for the titration is close to 300 kb.

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