نتایج جستجو برای: ژن 18s rrna
تعداد نتایج: 47023 فیلتر نتایج به سال:
زمینه و هدف: بلاستوسیستیس تک یاخته ای بیهوازی است که در دستگاه گوارش انسان زندگی کرده و میتواند بعنوان یک انگل زئونتیک در میزبان های مختلفی نیز وجود داشته باشد. این مطالعه در جهت شناسایی ساب تایپ ها و بررسی تنوع ژنتیک بلاستوسیستیس از نمونه های انسانی شهرستانهای ارومیه، تبریز و مراغه در شمال غرب ایران انجام گرفته است. روش بررسی: در این مطالعه که به روش توصیفی-مقطعی است،600 نمونهی مدفوع انسانی...
18S rRNA processing requires base pairings of snR30 H/ACA snoRNA to eukaryote-specific 18S sequences
The nuclear small subunit rRNA (18S) has played a dominant role in the estimation of relationships among insect orders from molecular data. In previous studies, 18S sequences have been aligned by unadjusted automated approaches (computer alignments that are not manually readjusted), most recently with direct optimization (simultaneous alignment and tree building using a program called "POY"). P...
Synthesis of rRNA in eukaryotes involves the action of a large population of snoRNA-protein complexes (snoRNPs), which create modified nucleotides and participate in cleavage of pre-rRNA. The snoRNPs mediate these functions through direct base pairing, in many cases through long complementary sequences. This feature suggests that RNA helicases may be involved in the binding and release of snoRN...
In eukaryotes, U3 snoRNA is essential for pre-rRNA maturation. Its 5'-domain was found to form base pair interactions with the 18S and 5'-ETS parts of the pre-rRNA. In Xenopus laevis, two segments of U3 snoRNA form base-pair interactions with the 5'-ETS region and only one of them is essential to the maturation process. In Saccharomyces cerevisiae, two similar U3 snoRNA-5' ETS interactions are ...
We have used comparative analyses of prokaryotic and eukaryotic small subunit ribosomal RNAs to deduce a secondary structure for the Dictyostelium discoideum 18S rRNA. Most of the duplex regions are evolutionarily conserved in all organisms. We have taken advantage of the variation to the D. discoideum sequence (relative to the yeast and frog 19S rRNAs) to identify additional helical regions wh...
Repeated sequences, like the 5.8S rRNA and its flanking regions in C. albicans, can be of particular interest as PCR targets; this is especially true if variations in sequence or length of these regions occur between members of a same genus or species (1). We therefore cloned ribosomal repetitive units of two C. albicans strains and determined the sequence of their respective Internal Transcrib...
We report the identification of a new gene, RRP3 (rRNA processing), which is required for pre-rRNA processing. Rrp3 is a 60.9 kDa protein that is required for maturation of the 35S primary transcript of pre-rRNA and is required for cleavages leading to mature 18S RNA. RRP3 was identified in a PCR screen for DEAD box genes. DEAD box genes are part of a large family of proteins homologous to the ...
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