[No authors listed]
Even in the absence of excisional loss of the associated Mu transposons, some Mu-induced mutant alleles of maize can lose their capacity to condition a mutant phenotype. Three of five Mu-derived rf2a alleles are susceptible to such Mu suppression. The suppressible rf2a-m9437 allele has a novel Mu transposon insertion (Mu10) in its 5' untranslated region (UTR). The suppressible rf2a-m9390 allele has a Mu1 insertion in its During suppression, alternative transcription initiation sites flanking the Mu1 transposon yield functional transcripts. The suppressible rf2a-m8110 allele has an rcy/Mu7 insertion in its Suppression of this allele occurs via a previously unreported mechanism; sequences in the terminal inverted repeats of rcy/Mu7 function as alternative polyadenylation sites such that the suppressed rf2a-m8110 allele yields functional rf2a transcripts. No significant differences were observed in the nucleotide compositions of these alternative polyadenylation sites as compared with 94 other polyadenylation sites from maize genes.
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