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  • 1
    Electronic Resource
    Electronic Resource
    Organization of the ribosomal RNA genes of Schizophyllum commune (1988)
    Springer
    Current genetics 13 (1988), S. 417-424 
    Details
    ISSN: 1432-0983
    Keywords: Schizophyllum ; Ribosomal DNA ; Gene organization ; Length polymorphisms ; Transcriptional initiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The 18, 5.8, 25 and 5S ribosomal RNA (rRNA) cistrons have been mapped on the ribosomal DNA (rDNA) unit repeat of Schizophyllum commune strain 4–40. These genes are spatially ordered in the sequence given. The presence of a large primary precursor rRNA which is processed to form the mature 18, 5.8 and 25S rRNAs has been demonstrated. We have mapped the site of transcriptional initiation for this rRNA primary precursor. The sequence surrounding this site has been determined and shown to be highly conserved, with considerable identity to those in Neurospora crassa and Dictyostelium discoideum. The direction of transcription of the rRNA genes has been determined. The 5S rRNA cistron is transcribed in the same direction as the other rRNAs, however it is not transcribed as a part of the large primary precursor. The previously identified rDNA strain-specific length polymorphisms (Specht et al. 1984) are shown to be located within the transcribed region of the rDNA unit repeat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365663
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Developmental regulation of the methylation of the ribosomal DNA in the basidiomycete fungusSchizophyllum commune (1988)
    Springer
    Current genetics 14 (1988), S. 105-111 
    Details
    ISSN: 1432-0983
    Keywords: Schizophyllum ; Methylation ; Ribosomal DNA ; Developmental regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ribosomal DNA (rDNA) ofSchizophyllum commune was shown previously to be highly methylated (Specht et al. 1984). To investigate the role of methylation of rDNA, a map of the recognition sites (CCGG) of the methylation-sensitive restriction endonucleases, MspI and Hpall, was prepared for the rDNA ofS. commune strain 4–40. The incidence of methylation at these CCGG sequences was analyzed. Our analyses demonstrate that either of the cytosines of the CCGG sequence can be methylated in Schizophyllum, however methylation of the internal cytosine is more frequent than methylation of the external cytosine. The external cytosines of CCGG sequences near the rDNA transcriptional initiation site are less frequently methylated than those else-where in the rDNA. The methylation of these sequences has been shown to be developmentally regulated inS. commune. We find that these sequences are more highly methylated in dikaryonic than homokaryotic cells. We propose that methylation of the rDNA may have a role in regulating the transcription of rRNA inS. commune.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569333
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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