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The 5'-flanking sequence of the loach oocyte 5S rRNA gene contains a signal for effective transcription. 1990

P Felgenhauer, and J Sedman, and N Shostak, and M Timofeeva, and A Lind, and A Bayev
W. Engelhardt Institute of Molecular Biology, USSR Academy of Sciences, Moscow.

Deletion mutants of loach oocyte 5S rRNA genes were injected and transcribed in vivo in the nuclei of loach (Misgurnus fossilis) and Xenopus laevis. A control region was found in the 5'-flanking sequence, the elimination of which greatly decreases in vivo transcription of 5S rRNA genes. This cis-acting element is located in the region between nt-18 and the transcription start point. We propose that the oocyte nucleus contains (a) specific transcriptional factor(s), NTFO, which interacts with the cis-acting element we described. We also propose that NTFO is inactivated in maturing oocytes when nucleoplasm interacts with oocyte cytoplasm after germinal vesicle breakdown. The residual activity of this factor(s) may be responsible for low-level synthesis of oocyte 5S rRNA at the beginning of embryogenesis. We consider the disappearance of NTFO during gastrulation to be responsible for the total inactivation of oocyte 5S rRNA genes in embryonic and somatic tissue.

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D009865 Oocytes Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocytes begin meiosis but are arrested at the diplotene state until OVULATION at PUBERTY to give rise to haploid secondary oocytes or ova (OVUM). Ovocytes,Oocyte,Ovocyte
D012045 Regulatory Sequences, Nucleic Acid Nucleic acid sequences involved in regulating the expression of genes. Nucleic Acid Regulatory Sequences,Regulatory Regions, Nucleic Acid (Genetics),Region, Regulatory,Regions, Regulatory,Regulator Regions, Nucleic Acid,Regulatory Region,Regulatory Regions
D002467 Cell Nucleus Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) Cell Nuclei,Nuclei, Cell,Nucleus, Cell
D003001 Cloning, Molecular The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells. Molecular Cloning
D003531 Cypriniformes An order of fish with 26 families and over 3,000 species. This order includes the families CYPRINIDAE (minnows and CARPS), Cobitidae (loaches), and Catostomidae (suckers). Catostomus,Loaches,Misgurnus,Suckers (Fish),Catastomus,Catostomidae,Cobitidae,Sucker (Fish)
D005775 Gastrula The developmental stage that follows BLASTULA or BLASTOCYST. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism. Archenteron,Blastopore,Gastrocoele,Primitive Gut,Archenterons,Blastopores,Gastrocoeles,Gastrulas,Gut, Primitive,Guts, Primitive,Primitive Guts
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA

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