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. 1979 Jun 11;6(7):2403–2422. doi: 10.1093/nar/6.7.2403

Evidence that populations of Dictyostelium single-copy mRNA transcripts carry common repeat sequences.

K L Kindle, R A Firtel
PMCID: PMC327862  PMID: 461193

Abstract

Two recombinant plasmids, M4 and KH10, carrying Dictyostelium DNA inserted into the Eco RI restriction endonuclease site of pMB9 by poly(dA)-poly(dT) tailing, were selected for study because they are complementary to abundant mRNA populations from Dictyostelium. Both plasmids have been shown to hybridize a heterogeneous size class of mRNAs which, in the case of KH10, comprise 5-10% of the pulse-labeled poly(A)+ RNA from vegetative cells. Analysis of the sequence organization of the two pieces of Dictyostelium DNA shows that they consist mostly of single-copy sequences with a short DNA sequence which is repeated in the genome and interspersed with single-copy DNA. These and other results suggest that the majority of the hybridization of pulse-labeled mRNA to M4 and KH10 is to the short "repeated" DNA sequences. In the genome, members of these repeat families appear to be transcribed onto a population of different single-copy mRNAs. Additional results show that M4 DNA contains a sequence which is entirely complementary to a discrete mRNA.

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Selected References

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