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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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A second gene in a Balbiani ring. Chironomus salivary glands contain a 6.5-kb poly(A)+ RNA that is transcribed from a hierarchy of tandem repeated sequences in Balbiani ring 1.

A second gene has been discovered at a previously studied Balbiani ring in Chironomus. Northern hybridizations demonstrated that cDNA clone pCt35 originated from a salivary gland specific 6.5-kilobase (kb) RNA that was abundant, nonribosomal, and apparently poly(A)+. pCt35 had a 120-base pair (bp) insert with 1.6 copies of a 75-bp sequence that contained two open reading frames. Southern hybridizations indicated that pCt35 was homologous to at least a 4-kb block of genomic DNA organized as a hierarchy of 150- and 300-bp tandem repeats. In situ hybridization localized these sequences to Balbiani ring 1. From these results we postulated that a 6.5-kb RNA gene may have evolved by stepwise duplication and amplification of a 75-bp ancestral sequence.[1]

References

  1. A second gene in a Balbiani ring. Chironomus salivary glands contain a 6.5-kb poly(A)+ RNA that is transcribed from a hierarchy of tandem repeated sequences in Balbiani ring 1. Dreesen, T.D., Bower, J.R., Case, S.T. J. Biol. Chem. (1985) [Pubmed]
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