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Mol Cell Biol. 1985 April; 5(4): 849-855

Isolation and characterization of genes differentially expressed during conidiation of Neurospora crassa.

ABSTRACT

A Neurospora crassa genomic DNA library was screened with a cDNA probe enriched in sequences expressed in conidiating cultures. Clones were isolated that preferentially hybridized to this probe versus a second cDNA probe complementary to polyadenylated RNA isolated from mycelia. Twelve clones contained unique sequences that hybridized to 22 transcripts, 19 of which accumulated preferentially in conidiating cultures. Eight transcripts were present in higher levels in conidiating cultures than in mycelia. Eleven transcripts were detected only in conidiating cultures and first appeared at different times during the asexual cycle. We mapped genomic sequences homologous to the 11 clones by conventional crosses using restriction fragment-length polymorphisms as genetic markers. The sequences homologous to genes expressed preferentially in conidiating cultures are distributed on six of the seven chromosomes. Clones that map to the same chromosome are linked. No recombination occurred between genomic sequences homologous to three clones, suggesting that the genes contained in these clones may constitute a gene cluster.

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