Comparative analysis of context-dependent mutagenesis in humans and fruit flies.

Abstract:

:In general, mutation frequencies are context-dependent: specific adjacent nucleotides may influence the probability to observe a specific type of mutation in a genome. Recently, several hypermutable motifs were identified in the human genome. Namely, there is an increased frequency of T>C mutations in the second position of the words ATTG and ATAG and an increased frequency of A>C mutations in the first position of the word ACAA. Previous studies have also shown that there is a remarkable difference between the mutagenesis of humans and drosophila. While C>T mutations are overrepresented in the CG context in humans (and other vertebrates), this mutation regularity is not observed in Drosophila melanogaster. Such differences in the observed regularities of mutagenesis between representatives of different taxa might reflect differences in the mechanisms involved in mutagenesis. We performed a systematical comparison of mutation regularities within 2-4 bp contexts in Homo sapiens and Drosophila melanogaster and found that the aforementioned contexts are not hypermutable in fruit flies. It seems that most mutation contexts affect mutation rates in a similar manner in H. sapiens and D. melanogaster; however, several important exceptions are noted and discussed.

journal_name

Int J Genomics

authors

Medvedeva SA,Panchin AY,Alexeevski AV,Spirin SA,Panchin YV

doi

10.1155/2013/173616

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

173616

eissn

2314-436X

issn

2314-4378

journal_volume

2013

pub_type

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