scholarly journals Simple method for analyzing the pattern of DNA polymorphism and its application to SNP data of human

2008 ◽  
Vol 83 (4) ◽  
pp. 353-360 ◽  
Author(s):  
Nobukazu Nawa ◽  
Fumio Tajima
Biomics ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 309-320
Author(s):  
O.Yu. Kiryanova ◽  
R.R. Garafutdinov ◽  
D.A. Chemeris ◽  
Yu.R. Giniyatov ◽  
I.M. Gubaidullin ◽  
...  

A rather simple method of detecting DNA polymorphism in dogs in the form of amplification of random fragments of the genome using RAPD analysis with primers with arbitrary nucleotide sequences, which does not require prior knowledge of the sequences of nitrogenous bases of the detected DNA fragments, is considered. However, information about the complete genomes of the investigating species of organisms and, dogs in particular, allows with a preliminary in silico RAPD analysis to predict the expected results for each primer and their multiplex composition, which makes it possible at this stage to reject unsuitable primers before conducting "wet" experiments. In the case of known genomes of a number of related organisms for example in this case dogs, the multiplex RAPD analysis conducted in silico with six decameric primers, the sequences of which exclude the formation of homo- and heterodimers in PCR showed both genomic similarities and differences between different breeds, as well as with their wild relative gray wolf. Multiplex in silico RAPD analysis is a virtual PCR and if amplicons common to all studied organisms are removed from such amplification, leaving only significant ones, then this tool in the form of the ABCDNA_GS program created by us can be used to establish phylogenetic kinship, especially of those organisms whose genomes are highly collinear, which is just typical of the genomes of different dog breeds.


2006 ◽  
Vol 100 (5) ◽  
pp. 1023-1031 ◽  
Author(s):  
Hiroo Higo ◽  
Sachio Miura ◽  
Takeshi Agatsuma ◽  
Tatsuyuki Mimori ◽  
Tetsuo Yanagi ◽  
...  

Genetics ◽  
1989 ◽  
Vol 123 (3) ◽  
pp. 585-595 ◽  
Author(s):  
F Tajima

Abstract The relationship between the two estimates of genetic variation at the DNA level, namely the number of segregating sites and the average number of nucleotide differences estimated from pairwise comparison, is investigated. It is found that the correlation between these two estimates is large when the sample size is small, and decreases slowly as the sample size increases. Using the relationship obtained, a statistical method for testing the neutral mutation hypothesis is developed. This method needs only the data of DNA polymorphism, namely the genetic variation within population at the DNA level. A simple method of computer simulation, that was used in order to obtain the distribution of a new statistic developed, is also presented. Applying this statistical method to the five regions of DNA sequences in Drosophila melanogaster, it is found that large insertion/deletion (greater than 100 bp) is deleterious. It is suggested that the natural selection against large insertion/deletion is so weak that a large amount of variation is maintained in a population.


Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.


Author(s):  
Dean A. Handley ◽  
Jack T. Alexander ◽  
Shu Chien

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.


2010 ◽  
Vol 34 (8) ◽  
pp. S75-S75
Author(s):  
Weifeng Zhu ◽  
Zhuoqi Liu ◽  
Daya Luo ◽  
Xinyao Wu ◽  
Fusheng Wan

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