Avtor/Urednik		Borštnik, B; Pumpernik, D; Lukman, D; Ugarkovič, D; Plohl, M
Naslov		Tandemly repeated pentanucleotides in DNA sequences of eucaryotes
Tip		članek
Vir		Nucleic Acids Res
Vol. in št.		Letnik 22, št. 16
Leto izdaje		1994
Obseg		str. 3412-7
Jezik		eng
Abstrakt		Genetic sequence data banks were scanned in order to retrieve tandemly repeated pentanucleotides (pnts). It was found that among 102 (=(1024-4)/2/5) possible distinct pnts roughly each fourth is involved in tandem repeats. It is shown that tandemly repeated pnts are composed of frequently occurring di- and trinucleotides and that those pnts which occur frequently in the form of mono- or di-pnts form also tandem repeats either in the form of satellites or in the form of shorter tandem repeats. Human satellite III is taken as a specific example. It is shown that the first guanine within GG-AAT pnt exhibits the highest mutability. Sequential distribution of base changes gives evidence that the mutations do not occur at random positions but in a correlated fashion so that long stretches of original pnts remain intact. It is found that pnts related to the satellite III are present in introns and flanking regions of some structural genes, but are not preserved between orthologous genes of related species. The results corroborate the most plausible mechanism of their evolution--rapid amplification followed by successive divergence of repeat units by various mutational processes.
Deskriptorji		DNA OLIGODEOXYRIBONUCLEOTIDES REPETITIVE SEQUENCES, NUCLEIC ACID BASE SEQUENCE DNA, SATELLITE GUANINE INTRONS MOLECULAR SEQUENCE DATA MUTATION PROBABILITY