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  • Genetic traceability of black pig meats using microsatellite markers

    Asian-Austraiasian Journal of Animal Sciences

    Pork from Jeju black pig (population J) and Berkshire (population B) has a unique market share in Korea because of their high meat quality. Due to the high demand of this pork, traceability of the pork to its origin is becoming an important part of the consumer demand. To examine the feasibility of such a system, we aim to provide basic genetic information of the two black pig populations and assess the possibility of genetically distinguishing between the two breeds. Muscle samples were collected from slaughter houses in Jeju Island and Namwon, Chonbuk province, Korea, for populations J and B, respectively. In total 800 Jeju black pigs and 351 Berkshires were genotyped at thirteen microsatellite (MS) markers. Analyses on the genetic diversity of the two populations were carried out in the programs MS toolkit and FSTAT. The population structure of the two breeds was determined by a Bayesian clustering method implemented in structure and by a phylogenetic analysis in Phylip. Population J exhibited higher mean number of alleles, expected heterozygosity and observed heterozygosity value, and polymorphism information content, compared to population B. The FIS values of population J and population B were 0.03 and ?0.005, respectively, indicating that little or no inbreeding has occurred. In addition, genetic structure analysis revealed the possibility of gene flow from population B to population J. The expected probability of identify value of the 13 MS markers was 9.87×10?14 in population J, 3.17×10?9 in population B, and 1.03×10?12 in the two populations. The results of this study are useful in distinguishing between the two black pig breeds and can be used as a foundation for further development of DNA markers.

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  • Comparative genomics reveals insights into avian genome evolution and adaptation


    Birds are the most species-rich class of tetrapod vertebrates and have wide relevance across many research fields. We explored bird macroevolution using full genomes from 48 avian species representing all major extant clades. The avian genome is principally characterized by its constrained size, which predominantly arose because of lineage-specific erosion of repetitive elements, large segmental deletions, and gene loss. Avian genomes furthermore show a remarkably high degree of evolutionary stasis at the levels of nucleotide sequence, gene synteny, and chromosomal structure. Despite this pattern of conservation, we detected many non-neutral evolutionary changes in protein-coding genes and noncoding regions. These analyses reveal that pan-avian genomic diversity covaries with adaptations to different lifestyles and convergent evolution of traits.

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  • Comparative Genomic Analysis of Staphylococcus aureus FORC_001 and S. aureus MRSA252 Reveal the Characteristics of Antibiotic Resistance and Virulence Factors for Human Infection

    Journal of Microbiology and Biotechnology

    Staphylococcus aureus is an important foodborne pathogen that causes diverse diseases ranging from minor infections to life-threatening conditions in humans and animals. To further understand its pathogenesis, the genome of the strain S. aureus FORC_001 was isolated from a contaminated food. Its genome consists of 2, 886, 017 bp double-stranded DNA with a GC content of 32.8%. It is predicted to contain 2, 728 open reading frames, 57 tRNAs, and 6 rRNA operons, including 1 additional 5S rRNA gene. Comparative phylogenetic tree analysis of 40 complete S. aureus genome sequences using average nucleotide identity (ANI) revealed that strain FORC_001 belonged to Group I. The closest phylogenetic match was S. aureus MRSA252, according to a whole-genome ANI (99.87%), suggesting that they might share a common ancestor. Comparative genome analysis of FORC_001 and MRSA252 revealed two non-homologous regions: Regions I and II. The presence of various antibiotic resistance genes, including the SCCmec cluster in Region I of MRSA252, suggests that this strain might have acquired the SCCmec cluster to adapt to specific environments containing methicillin. Region II of both genomes contains prophage regions but their DNA sequence identity is very low, suggesting that the prophages might differ. This is the first report of the complete genome sequence of S. aureus isolated from a real foodborne outbreak in South Korea. This report would be helpful to extend our understanding about the genome, general characteristics, and virulence factors of S. aureus for further studies of pathogenesis, rapid detection, and epidemiological investigation in foodborne outbreak.

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  • Genome-wide DNA Methylation Profiles of Small Intestine and Liver in Fast-growing and Slow-growing Weaning Piglets

    Asian-Austraiasian Journal of Animal Sciences

    Although growth rate is one of the main economic traits of concern in pig production, there is limited knowledge on its epigenetic regulation, such as DNA methylation. In this study, we conducted methyl-CpG binding domain protein-enriched genome sequencing (MBD-seq) to compare genome-wide DNA methylation profile of small intestine and liver tissue between fast- and slow-growing weaning piglets. The genome-wide methylation pattern between the two different growing groups showed similar proportion of CpG (regions of DNA where a cytosine nucleotide occurs next to a guanine nucleotide in the linear sequence) coverage, genomic regions, and gene regions. Differentially methylated regions and genes were also identified for downstream analysis. In canonical pathway analysis using differentially methylated genes, pathways (triacylglycerol pathway, some cell cycle related pathways, and insulin receptor signaling pathway) expected to be related to growth rate were enriched in the two organ tissues. Differentially methylated genes were also organized in gene networks related to the cellular development, growth, and carbohydrate metabolism. Even though further study is required, the result of this study may contribute to the understanding of epigenetic regulation in pig growth.

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  • A Novel Genetic Variant Database for Korean Native Cattle (Hanwoo): HanwooGDB

    Genes & Genomics

    Korean native cattle, known as Hanwoo, have been raised in the Korean Peninsula since 2000 B.C. for use as a draft animal. However, Hanwoo now have an important position in the Korean livestock industry as a meat source. Therefore, the breeding and selection of Hanwoo are crucial for the industry. Although many researchers have studied the genetic architecture of Hanwoo, no well-established Hanwoo-related databases exist. In order to better understand the genetic contents of Hanwoo, an integrated database is necessary. We constructed a genetic variants database including annotation information. HanwooGDB (http://?hanwoogdb.?snu.?ac.?kr) provides genetic variants (SNPs, INDELs, CNVs) in the Hanwoo genome produced by Next Generation Sequencing data collected from 23 cattle. The identified SNPs were integrated with SNP chip data and annotation information for checking the concordance of position of each SNP and inferring functional aspects. This database provides browsers to understand and visualize the comprehensive information of these variants and allows users to download data according to their preference from this database without limitation. This database will contribute to genetic research and development of Hanwoo breeding strategies.

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  • VCS: tool for Visualizing Copy number variation and Single nucleotide polymorphism

    Asian-Austraiasian Journal of Animal Sciences.

    Copy number variation (CNV) or single nucleotide phlyorphism (SNP) is useful genetic resource to aid in understanding complex phenotypes or deseases susceptibility. Although thousands of CNVs and SNPs are currently avaliable in the public databases, they are somewhat difficult to use for analyses without visualization tools. We developed a web-based tool called the VCS (visualization of CNV or SNP) to visualize the CNV or SNP detected. The VCS tool can assist to easily interpret a biological meaning from the numerical value of CNV and SNP. The VCS provides six visualization tools: i) the enrichment of genome contents in CNV; ii) the physical distribution of CNV or SNP on chromosomes; iii) the distribution of log2 ratio of CNVs with criteria of interested; iv) the number of CNV or SNP per binning unit; v) the distribution of homozygosity of SNP genotype; and vi) cytomap of genes within CNV or SNP region.

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  • The association of SLC6A4 5-HTTLPR and TRPV1 945G>C with functional dyspepsia in Korea

    Journal of Gastroenterology and Hepatology

    Background and Aim
    The association of various genetic polymorphisms with functional dyspepsia (FD) has been suggested, but the results were still controversial. The aim of the present study was to assess the association of GNB3 825C>T, SLC6A4 5-HTTLPR, ADRA2A-1291C>G, CCK-1R intron 779T>C, and TRPV1 945G>C polymorphisms with FD based on Rome III criteria in Korea.
    Study subjects were prospectively recruited from visitors to Seoul National University Bundang Hospital between 2009 and 2012. One hundred and twelve FD patients and 269 controls were enrolled.
    In SLC6A4 5-HTTLPR polymorphism, the frequency of S/S genotype was significantly lower than that of L/L?+?L/S genotype in FD compared to controls (P?

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  • Semantic Modeling for SNPs associated with ethnic disparities in HapMap samples

    Genomics & Informatics

    Single-nucleotide polymorphisms (SNPs) have been emerging out of the efforts to research human diseases and ethnic disparities. A semantic network is needed for in-depth understanding of the impacts of SNPs, because phenotypes are modulated by complex networks, including biochemical and physiological pathways. We identified ethnicity-specific SNPs by eliminating overlapped SNPs from HapMap samples, and the ethnicity-specific SNPs were mapped to the UCSC RefGene lists. Ethnicity-specific genes were identified as follows: 22 genes in the USA (CEU) individuals, 25 genes in the Japanese (JPT) individuals, and 332 genes in the African (YRI) individuals. To analyze the biologically functional implications for ethnicity-specific SNPs, we focused on constructing a semantic network model. Entities for the network represented by Gene, Pathway, Disease, Chemical, Drug, ClinicalTrials, SNP, and relationships between entity-entity were obtained through curation. Our semantic modeling for ethnicity-specific SNPs showed interesting results in the three categories, including three diseases (AIDS-associated nephropathy, Hypertension, and Pelvic infection), one drug (Methylphenidate), and five pathways (Hemostasis, Systemic lupus erythematosus, Prostate cancer, Hepatitis C virus, and Rheumatoid arthritis). We found ethnicity-specific genes using the semantic modeling, and the majority of our findings was consistent with the previous studies that an understanding of genetic variability explained ethnicity-specific disparities.

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  • Estimating effective population size of thoroughbred horses using linkage disequilibrium and theta (4Nμ) value

    Livestock Science

    With the availability of genome-wide data, it has become possible to perform the analysis of single nucleotide polymorphisms (SNPs). In this study, we used Sved?s original relationship and the revised Hill?s formula to determine effective population size. The effective population size (Ne) can be calculated as a coefficient when the correlation coefficient of linkage disequilibrium (LD) is related to the recombination rate. We used SNPs with the kinship matrix of all chromosomes, with the kinship matrix of each chromosome, and without the kinship matrix. The calculation of theta (θ) and the mutation rate using the Kimura 2-parameter model (K2P) was used to determine Ne. Using these two methods, Ne of Korean Thoroughbred horses was estimated to be 79 and 77 for LD and theta (θ), respectively. We also computed the historical effective size of Thoroughbred horses which showed a gradual decrease in size from 100 generations ago to the present.

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  • Thoroughbred Horse Single Nucleotide Polymorphism and Expression Database: HSDB

    Asian-Austraiasian Journal of Animal Sciences

    Genetics is important for breeding and selection of horses but there is a lack of well-established horse-related browsers or databases. In order to better understand horses, more variants and other integrated information are needed. Thus, we construct a horse genomic variants database including expression and other information. Horse Single Nucleotide Polymorphism and Expression Database (HSDB) (http://snugenome2.snu.ac.kr/HSDB) provides the number of unexplored genomic variants still remaining to be identified in the horse genome including rare variants by using population genome sequences of eighteen horses and RNA-seq of four horses. The identified single nucleotide polymorphisms (SNPs) were confirmed by comparing them with SNP chip data and variants of RNA-seq, which showed a concordance level of 99.02% and 96.6%, respectively. Moreover, the database provides the genomic variants with their corresponding transcriptional profiles from the same individuals to help understand the functional aspects of these variants. The database will contribute to genetic improvement and breeding strategies of Thoroughbreds.

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