A putative rhamnogalacturonase required for sexual development of Neurospora crassa.

Genetics
M A NelsonR L Metzenberg

Abstract

In previous work, the asd-I (ascus development) gene of the filamentous fingus Neurospora crassa was identified as a gene expressed preferentially during the sexual cycle and shown to be essential for normal sexual development. The asd-I gene has been sequenced and further characterized. It contains two introns, the first of which is in-frame and inefficiently or differentially spliced. The predicted ASD-I protein has extensive homology with rhamnogalacturonase B of Aspergillus aculeatus, which cleaves the backbone within the ramified hairy regions of pectin. In homozygous asd-I crosses, sexual development is initiated and large numbers of normal-sized asci are formed. Ascospore delineation does not occur, however, and no sexual progeny are produced. As most asd-I asci contain eight nuclei, the two meiotic divisions and subsequent mitotic division typical of normal crosses seem to occur, but the haploid nuclei are not partitioned into ascospores. In wild-type crosses, the ASD-I protein is present in large amounts in croziers and young asci, but it is only faintly detectable in more mature asci containing developing ascospores. Models to explain the possible role of a rhamnogalacturonase in sexual development are presented.

Citations

Apr 4, 2000·Current Opinion in Microbiology·P K Shiu, N L Glass
Mar 10, 2007·The Plant Journal : for Cell and Molecular Biology·Radnaa NaranAndrew J Mort
May 21, 1998·Fungal Genetics and Biology : FG & B·M S Sachs
Feb 20, 2003·Journal of Bacteriology·Minna Laatu, Guy Condemine
Sep 30, 2021·Microbiology and Molecular Biology Reviews : MMBR·Andi M WilsonBrenda D Wingfield
Aug 12, 2009·Proceedings of the National Academy of Sciences of the United States of America·Verena SeidlMonika Schmoll

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