Temporal patterns of nucleotide misincorporations and DNA fragmentation in ancient DNA.
Temporal patterns of nucleotide misincorporations and DNA fragmentation in ancient DNA.
复制标题
DOI:
10.1371/journal.pone.0034131
复制
发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Pääbo S
中科院分区:
文献类型:
--
作者:
Sawyer S;Krause J;Guschanski K;Savolainen V;Pääbo S
DNA that survives in museum specimens, bones and other tissues recovered by archaeologists is invariably fragmented and chemically modified. The extent to which such modifications accumulate over time is largely unknown but could potentially be used to differentiate between endogenous old DNA and present-day DNA contaminating specimens and experiments. Here we examine mitochondrial DNA sequences from tissue remains that vary in age between 18 and 60,000 years with respect to three molecular features: fragment length, base composition at strand breaks, and apparent C to T substitutions. We find that fragment length does not decrease consistently over time and that strand breaks occur preferentially before purine residues by what may be at least two different molecular mechanisms that are not yet understood. In contrast, the frequency of apparent C to T substitutions towards the 5′-ends of molecules tends to increase over time. These nucleotide misincorporations are thus a useful tool to distinguish recent from ancient DNA sources in specimens that have not been subjected to unusual or harsh treatments.
登录
查看更多内容
影响因子:
12.3
作者:
Kircher M;Stenzel U;Kelso J
通讯作者:
Kelso J
影响因子:
3.7
作者:
García-Garcerà M;Gigli E;Sanchez-Quinto F;Ramirez O;Calafell F;Civit S;Lalueza-Fox C
通讯作者:
Lalueza-Fox C
影响因子:
9.2
作者:
Ermini, Luca;Olivieri, Cristina;Rollo, Franco
通讯作者:
Rollo, Franco
影响因子:
14.9
作者:
Briggs AW;Stenzel U;Meyer M;Krause J;Kircher M;Pääbo S
通讯作者:
Pääbo S
DOI:
10.1093/bioinformatics/btp352
发表时间:
2009-08-15
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
Li H;Handsaker B;Wysoker A;Fennell T;Ruan J;Homer N;Marth G;Abecasis G;Durbin R;1000 Genome Project Data Processing Subgroup
通讯作者:
1000 Genome Project Data Processing Subgroup