ArticleNucleic acids research1990
rRNA genes from the lower chordate Herdmania momus: structural similarity with higher eukaryotes.
Article in Nucleic acids research, 1990. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
7 citing papers in PubMed, 22 citations in OpenAlex.
- Dropout alignment allows homology recognition and evolutionary analysis of rDNA intergenic spacers.Journal of molecular evolution · 2008Article
- Multiple origins of anural development in ascidians inferred from rDNA sequences.Journal of molecular evolution · 1995Article
- The sequence of 28S ribosomal RNA varies within and between human cell lines.Nucleic acids research · 1993Article
- Extrachromosomal ribosomal DNA of Didymium iridis: sequence analysis of the large subunit ribosomal RNA gene and sub-telomeric region.Current genetics · 1992Article
- A compilation of large subunit (23S- and 23S-like) ribosomal RNA structures.Nucleic acids research · 1992Article
- Compilation of small ribosomal subunit RNA sequences.Nucleic acids research · 1992Article
- New nucleotide sequence data on the EMBL File Server.Nucleic acids research · 1991Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Ascidians, primitive chordates that have retained features of the likely progenitors to all vertebrates, are a useful model to study the evolutionary relationship of chordates to other animals. We have selected the well characterized ribosomal RNA (rRNA) genes to investigate this relationship, and we describe here the cloning and characterization of an entire ribosomal DNA (rDNA) tandem repeat unit from a lower chordate, the ascidian Herdmania momus. rDNA copy number and considerable sequence differences were observed between two H. momus populations. Comparison of rDNA primary sequence and rRNA secondary structures from H. momus with those from other well characterized organisms, demonstrated that the ascidians are more closely related to other chordates than invertebrates. The rDNA tandem repeat makes up a larger percentage (7%) of the genome of this animal than in other higher eukaryotes. The total length of the spacer and transcribed region in H. momus rDNA is small compared to most higher eukaryotes, being less than 8 kb, and the intergenic spacer region consists of smaller internal repeats. Comparative analysis of rDNA sequences has allowed the construction of secondary structures for the 18S, 5.8S and 26S rRNAs.
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