Neurospora crassa nuclear genome contains analogy of Saccharomyces cerevisiae genes for ribosomal RNA processing

Summary Neurospora crassa wild type genome shows DNA sequences which are homologous to the sequences present in the rRNA processing genes of the yeast Saccharomyces cerevisiae. Five such processing genes from yeast, viz., RNA1 through RNA5, cloned in plasmid pBR322 were transformed in Escherichia coli strain LE392. Southern blots containing DNAs from these clones were restricted with several restriction endonucleases along with DNAs from lambda phage, rice (plant) and neuroblastoma (animal), were hybridized with ³²P-labelled nick-translated N. crassa nuclear DNA under very stringent conditions. Autoradiograms of these blots revealed that four yeast rRNA processing genes (RNA1, RNA2, RNA3, and RNA4) showed homology with N. crassa nuclear DNA but such analogs were not found in DNAs representing prokaryotes, phages, higher plants and animals.