Struktura obiektu

Autor:

Renwick, Alexander ; Bonnen, Penelope E. ; Trikka, Dimitra ; Nelson, David L. ; Chakraborty, Ranajit ; Kimmel, Marek

Współtwórca:

Kimmel, Marek - red. ; Lachowicz, Mirosław - red. ; Świerniak, Andrzej - red.

Tytuł:

Sampling properties of estimators of nucleotide diversity at discovered SNP sites

Podtytuł:

Cancer Growth and Progression, Mathematical Problems and Computer Simulations

Tytuł publikacji grupowej:

AMCS, volume 13 (2003)

Temat i słowa kluczowe:

single nucleotide polymorphisms ; ascertainment bias ; nucleotide diversity ; molecular evolution

Abstract:

SNP sites are generally discovered by sequencing regions of the human genome in a limited number of individuals. This may leave SNP sites present in the region, but containing rare mutant nucleotides, undetected. Consequently, estimates of nucleotide diversity obtained from assays of detected SNP sites are biased. ; In this research we present a statistical model of the SNP discovery process, which is used to evaluate the extent of this bias. This model involves the symmetric Beta distribution of variant frequencies at SNP sites, with an additional probability that there is no SNP at any given site. ; Under this model of allele frequency distributions at SNP sites, we show that nucleotide diversity is always underestimated. However, the extent of bias does not seem to exceed 10-15% for the analyzed data. ; We find that our model of allele frequency distributions at SNP sites is consistent with SNP statistics derived based on new SNP data at ATM, BLM, RQL and WRN gene regions. The application of the theory to these new SNP data as well as to the literature data at the LPL gene region indicates that in spite of ascertainment biases, the observed differences of nucleotide diversity across these gene regions are real. ; This provides interesting evidence concerning the heterogeneity of the rates of nucleotide substitution across the genome.

Wydawca:

Zielona Góra: Uniwersytet Zielonogórski

Data wydania:

2003

Typ zasobu:

artykuł

Strony:

385-394

Źródło:

AMCS, volume 13, number 3 (2003) ; kliknij tutaj, żeby przejść

Jezyk:

eng

Prawa do dysponowania publikacją:

Biblioteka Uniwersytetu Zielonogórskiego