Publication Date:
1990-12-14
Description:
Introns have been found in the genomes of all major groups of organisms except eubacteria. The presence of introns in chloroplasts and mitochondria, both of which are of eubacterial origin, has been interpreted as evidence either for the recent acquisition of introns by organelles or for the loss of introns from their eubacterial progenitors. The gene for the leucine transfer RNA with a UAA anticodon [tRNALeu (UAA)] from five diverse cyanobacteria and several major groups of chloroplasts contains a single group I intron. The intron is conserved in secondary structure and primary sequence, and occupies the same position, within the UAA anticodon. The homology of the intron across chloroplasts and cyanobacteria implies that it was present in their common ancestor and that it has been maintained in their genomes for at least 1 billion years.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuhsel, M G -- Strickland, R -- Palmer, J D -- 35087/PHS HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1570-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington 47405.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2125748" target="_blank"〉PubMed〈/a〉
Keywords:
Anticodon/genetics
;
Base Sequence
;
Biological Evolution
;
Chloroplasts/*metabolism
;
Cloning, Molecular
;
Cyanobacteria/genetics
;
Eubacterium/*genetics
;
Eukaryota/genetics
;
Introns/*genetics
;
Molecular Sequence Data
;
Nucleic Acid Conformation
;
Plants/genetics
;
Polymerase Chain Reaction
;
RNA, Transfer, Leu/*genetics
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
