Deletion of the unique gene encoding a typical histone H1 has no apparent phenotype in Aspergillus nidulans.
We have cloned the H1 histone gene (hhoA) of Aspergillus nidulans. This single-copy gene codes for a typical linker histone with one central globular domain. The open reading frame is interrupted by six introns. The position of the first intron is identical to that of introns found in some plant histones. An H1-GFP fusion shows exclusive nuclear localization, whereas chromosomal localization can be observed during condensation at mitosis. Surprisingly, the deletion of hhoA results in no obvious phenotype. The nucleosomal repeat length and susceptibility to micrococcal nuclease digestion of A. nidulans chromatin are unchanged in the deleted strain. The nucleosomal organization of a number of promoters, including in particular the strictly regulated niiA-niaD bidirectional promoter is not affected.
Ramón
A
A
Institut de Génétique et Microbiologie, Bâtiment 409, Université Paris-Sud, UMR 8621, 91405 Orsay Cedex, France.
Muro-Pastor
M I
MI
Scazzocchio
C
C
Gonzalez
R
R
D000595:Amino Acid Sequence; D001233:Aspergillus nidulans / Q000235:genetics*; D001483:Base Sequence; D015825:Chromosomes, Fungal; D003001:Cloning, Molecular; D004271:DNA, Fungal; D029968:Escherichia coli Proteins; D017353:Gene Deletion; D006657:Histones / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010641:Phenotype; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000235:genetics*; D014158:Transcription, Genetic
D004271:DNA, Fungal; D029968:Escherichia coli Proteins; D006657:Histones; C098059:DegQ protein, E coli; D012697:Serine Endopeptidases