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1.  Primordial spliceosomal introns were probably U2-type 
Trends in Genetics  2008;24(11):525-528.
The two types of eukaryotic spliceosomal introns, U2 and U12, possess different splice signals and are excised by distinct spliceosomes. The nature of the primordial introns remains uncertain. A comparison of the amino acid distributions at insertion sites of introns that retained their positions throughout eukaryotic evolution with the distributions for human and Arabidopsis thaliana U2 and U12 introns reveals close similarity with U2 but not U12. Thus, the primordial spliceosomal introns were, most likely, U2-type.
PMCID: PMC3381341  PMID: 18824272
2.  Nested genes and increasing organizational complexity of metazoan genomes 
Trends in Genetics  2008;24(10):475-478.
The most common form of protein-coding gene overlap in eukaryotes is a simple nested structure, whereby one gene is embedded in an intron of another. Analysis of nested protein-coding genes in vertebrates, fruit flies and nematodes revealed substantially higher rates of evolutionary gains than losses. The accumulation of nested gene structures could not be attributed to any obvious functional relationships between the genes involved and represents an increase of the organizational complexity of animal genomes via a neutral process.
PMCID: PMC3380635  PMID: 18774620

Results 1-2 (2)