Macronuclear Symbionts in Euplotes Crassus (Ciliata Hypotrichida)
نویسندگان
چکیده
منابع مشابه
Ciliary organelles and associated fibre systems in Euplotes eurystomus (Ciliata, hypotrichida). I. Fine structure.
Euplotes eurystomus bears 8 rows of single, non-motile simple cilia, 18 ventral cirri, and a row of adoral membranelles. Each cirrus contains 40-120 cilia in tight hexagonal packing, and each membranelle consists of 3 rows of 10-40 cilia; the component cilia adhere together in life, but no means of adhesion, other than small protuberances of the ciliary membrane, has been seen. The kinetosomes ...
متن کاملLarge scale synchronous mating and the study of macronuclear development in Euplotes crassus
After conjugation in hypotrichous ciliates, a new macronucleus is produced from a copy of the micronucleus. This transformation involves large-scale reorganization of DNA, with conversion of the chromosomal micronuclear genome into short, gene-sized DNA molecules in the macronucleus. To study directly the changes that occur during this process, we have developed techniques for synchronous matin...
متن کاملFaithful expression of a heterologous gene carried on an artificial macronuclear chromosome in Euplotes crassus.
Macronuclear chromosomes of hypotrichous ciliates are gene-sized molecules carrying the coding sequence flanked by short non-translated regions and bounded by telomeres. We have constructed artificial chromosomes for investigation of transcription in the macronucleus of Euplotes crassus. The neo gene was put under the control of the 5"-non-translated region of the TBP gene of E.crassus. These m...
متن کاملSequencing of random Euplotes crassus macronuclear genes supports a high frequency of +1 translational frameshifting.
Programmed translational frameshifts have been identified in genes from a broad range of organisms, but typically only a very few genes in a given organism require a frameshift for expression. In contrast, a recent analysis of gene sequences available in GenBank from ciliates in the genus Euplotes indicated that >5% required one or more +1 translational frameshifts to produce their predicted pr...
متن کاملMacronuclear Duplication in the Ciliated Protozoan Euplotes
The ribbon-like macronucleus of Euplotes eurystomus pinches in half amitotically at each cell division. Several hours before the actual division two lightly staining duplication bands (reorganization bands) appear at the ends of the nucleus and approach each other slowly, finally meeting near the middle. Distal to the bands, that is, in regions through which the bands have already passed, the c...
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ژورنال
عنوان ژورنال: Bolletino di zoologia
سال: 1975
ISSN: 0373-4137
DOI: 10.1080/11250007509431435