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The transcriptional organization of the

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The genetic organization of the spoVAF–serA area of the Bacillus subtilis chromosome and its putative transcription map have been derived from analysis of the nucleotide sequence. In order to confirm this transcription map as regards size of transcripts and to determine growth conditions for their appearance, we undertook Northern hybridization analysis of total RNA from vegetatively growing and sporulating cells. Twenty‐three distinct transcripts were thus identified, 14 of which were predicted from sequence analysis and nine of which were not predicted. Eight of the latter are homologous to open reading frames identified by sequence analysis but were not expected, since no obvious promoter or terminator was found in the sequence. The last unexpected transcript does not correspond to an ORF and might identify a novel gene. Three predicted transcripts were not detected. The transcripts were classified in four groups as (i) constitutive, (ii) regulated by nutritional depletion, (iii) specific for sporulation, and (iv) possibly regulated temporally. These studies demonstrate that systematic Northern analysis of a bacterial chromosome region is a useful complement to sequence analysis.
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Document Type: Original Article

Affiliations: Laboratoire de Génétique Microbienne, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy en Josas Cedex, France.

Publication date: October 1, 1993

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