The Jindo dog is a Korean natural monument and is recognized by the Fédération Cynologique Internationale. A prominent feature is the diverse coat color within the breed. To analyze the genetic basis of variation in the Jindo coat color, we sequenced the protein-coding regions of the melanocortin 1 receptor gene (MC1R). The MC1R coding sequence was determined from 154 dogs in five breeds (Jindo, Labrador Retriever, English Springer Spaniel, Belgian Malinois, and German Shepherd). To confirm the genetic structure of sampled populations, we tested for Hardy-Weinberg equilibrium (HWE) and computed $F_{st}$ The sample populations did not significantly deviate from HWE. $F_{st}$ was 0.02 between white and fawn Jindo dogs; this was lower than $F_{st}$ between breeds. Six single nucleotide polymorphisms (SNPs) were detected in the MC1R coding region. Among the six SNPs, five were non-synonymous (S90G, T105A, Q159P, M264V, and R306ter) and one was synonymous SNP (Y298Y). From the SNPs, we predicted four haplotypes (H1, H2, H3, and H4) for Jindo MC1R. Jindo dogs had different haplotypes corresponding to different coat colors. H1 was frequently observed in white Jindo dogs with an odds ratio of 5.03 (95% CI: 2.27-11.18, p<0.0001), whereas H2 and H4 were observed only in fawn Jindo dogs. Our findings indicate that SNP haplotype can influence coat color. Knowledge of MC1R haplotypes can help discriminate white and fawn coats in Jindo dogs. We hope this report will trigger more research into the genetics of this traditional Korean dog and will be a reference for dogs of Asian origin. Also, our results will provide a useful genetic marker for Jindo dog breeders who have selected for specific colors.
This study aimed to investigate the single nucleotide polymorphisms (SNPs) of the porcine MC4R gene and validate the effect of the MC4R genotype for marker assisted selection (MAS). Six amplicons were produced to analyze the entire base sequences of the porcine MC4R gene and six SNPs were detected (c.-780C>G, c.-135C>T, c.175C>T-Leu59Leu, c.707A>G-Arg236His, c.892A>G-Asp298Asn, and c.*430A>T). Linkage disequilibrium (LD) of the six SNPs was analyzed by performing haploid analysis. There was a perfect linkage disequilibrium in c.-780C>G, c.-135C>T, c.175C>T-Leu59Leu, c.707A>G-Arg236His, and c.*430A>T. Only the c.892A>G (Asp298Asn) SNP showed a very low LD with an $r^2$ value of 0.028 and the D' value of 0.348. As a result, the two SNPs-c.707A>G (Arg236His) and c.892A>G (Asp298Asn)-were selected to extract the genotype frequencies from the 5 pig breeds by using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) genotype analysis method. The SNP frequency of c.707A>G (Arg236His) indicated the presence of the A (His) allele only in Yorkshire, while the G allele was fixed in the KNP, Landrace, Berkshire, and Duroc. Association analysis was carried out in 484 pigs with the c.707A>G (Arg236His) SNP and the meat quality traits of four different pig cross populations: a significant association was noted in crude fat, sirloin moisture, meat color, and the degree of red and yellow coloration. The frequency of the c.892A>G(Asp298Asn) SNP genotype varied among the breeds; while Duroc showed the highest frequency of the A (Asn) allele, KNP showed the highest frequency of the G (Asp) allele. Association analysis was carried out in 1126 pigs with the c.892A>G (Asp298Asn) SNP and the meat quality traits of four pig populations: a highly significant linkage was noted in the back-fat thickness (P<0.002). It was found that the back-fat thickness was higher in individuals with the AA genotype than in those with the AG or GG genotype. Thus, in this study, we verified that the c.892A>G (Asp298Asn) SNP in the pig MC4R gene has a sufficient effect as a gene marker for MAS in Korean pork industry.
Proceedings of the Korean Society for Food Science of Animal Resources Conference
/
2000.11a
/
pp.59-75
/
2000
This study was carried out to develop a DNA marker for identifying between Korean cattle (Hanwoo) and other breeds. First experiment was performed to isolate Hanwoo specific DNA marker at sequence characterized amplified regions (SCARs). Five breeds of cattle including Hanwoo, Holstein, Hereford, Angus and Charolais were represented with the from 8 to 20 individuals. Fourteen primers of 300 arbitrary primers of 10 nucleotides showed reproducible polymorphism across the breeds. An amplified band of 0.9 kb in the primer MG-3 showed the specificity to Holstein breed. And MG-6 and MG-12 detected the Hereford and Hanwoo specific markers at the size of 2.0 kb and 1.0 kb, respectively. A 1.0 kb band of MG-12 was cloned and sequenced. A SCAR primer was designed based on the obtained sequences. It was possible to identify the Hanwoo from Holstein breed. Second experiment was carried out to observe the genotype frequencies of MC1R in 1,044 samples of imported beef and eight different cattle breeds including Hanwoo, Holstein, Angus, Brown-Swiss, Charolais, Limousin, Simmental and Hereford. The primers for the amplification of bovine MC1R gene were designed based on a bovine MC1R gene sequence (GenBank accession no.Y19103). A size of 350 bp was amplified by polymerase chain reaction(PCR), digested with two different restriction enzyme, BsrFI and MspA II, and electrophoresed in 2.5% Metaphore agarose gel for determination of genotypes. Genotype frequencies of Hanwoo were 0.10 in E+e and 0.90 in ee. Allele ED was shown in all of Holstein and Angus breeds tested which have black coat color phenotypes. We suggested that SCAR marker and the bovine MC1R gene could be used as a DNA marker for distinguishing beef between Hanwoo and Holstein.
Proceedings of the Korean Society of Applied Pharmacology
/
1996.11a
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pp.153-159
/
1996
${\alpha}$-Melanotropin (Ac-Ser-Tyr- Ser-Met-Glu$\^$5/-His-Phe-Arg-Trp-Gly$\^$10/-Lys-Pro-Val-NH$_2$) is one of the first peptide hormones to be isolated and have its structure determined. It was early recognized to have essentially the same N-terminal tridecapeptide sequence as adrenocorticotropic hormone (ACTH) except that the N-terminal was acetylated in the case of ${\alpha}$-MSH but not in the case of ACTH, indicating that their biosyntheses were different (Figure 1). Subsequently it was discovered that ${\alpha}$-MSH and ACTH were derived from the same gene, currently referred to as proopiomelanocortin (POMC). Its original bioactivity was pigmentation, but it also was recognized that it may have activity in the central nervous system, though the precise nature of these central activities have been controversial. The recent cloning and expression of five melanocortin receptors, with the MC3 and MC4 receptors found primarily in the brain and the MC5 receptor (MC5-R) found throughout the body, has provided new impetus to understand the structure-activity relationships of ${\alpha}$-MSH at these receptors. The effects of ${\alpha}$-MSH on pigmentation are mediated by the MC1-R expressed specifically on the surface of melanocytes. Similarly the MC2-R is involved in the regulation of adrenal steroidogenesis by ACTH. However, given the complexity of expression of the MC3, MC4, and MC5 receptors, it has not been possible to identify any simple correlations between these receptors and the reported biological activities of the melanocortin peptides. Consequently, potent and receptor specific agonists and especially antagonists would be extremely valuable tools for the determination of the physiological roles of the MC3, MC4, and MC5 receptors. Though the extensive structure-activity relationships have provided much information on agonist activity related to pigmentary effects, only recently has it been possible to begin to systematically develop potent and selective antagonists.
Park, Jae-Hee;Lee, Hae-Lee;Kim, Yong-Su;Kim, Jong-Gug
Journal of Animal Science and Technology
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v.54
no.4
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pp.255-265
/
2012
The objectives of this study were to investigate MC1R genotype, coat color, and muzzle phenotype variationsin the Korean native brindle cattle (KNBC) maintaining family lines and to establish the mating system for increased brindle coat color appearance. KNBC with genotype and phenotype records were selected as experimental animals. The relationship between melanocortin 1 receptor (MC1R) genotypes, verified by PCR-RFLP, and brindle coat color appearance was determined. Fragments of the MC1R gene amplified by PCR were digested with MspI and RFLP was determined. KNBC had $E^+E^+$, $E^+e$, and ee genotypes. The $E^+e$ genotype was most common with 65%, compared to $E^+E^+$ (33.33%), or ee (1.67%). When the sire had $E^+e$ genotype and the dam had $E^+E^+$ genotype, and both of them had the whole body-brindle coat color, all of their offspring (4/4) had whole body-brindle coat color. When the sire had $E^+E^+$ genotype and the dam had $E^+e$ genotype, and both had whole body-brindle coat color, 44.44% (4/9) of the offspring had whole body-brindle coat color. The mating between the sires and dams with these two genotypes with whole body-brindle coat color may have the highest whole body-brindle coat color appearance in their offspring. Muzzle grades 3 or 4 were more common than other muzzle grades. This is the first report indicating the segregation of MC1R genotypes and the inheritance of coat color through family lines in KNBC. The mating system proposed from this study may increase the possibility of brindle coat color appearance in KNBC.
Rapuano, Bruce E.;Hackshaw, Kyle;Macdonald, Daniel E.
Journal of Periodontal and Implant Science
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v.42
no.3
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pp.95-104
/
2012
Purpose: The purpose of this study was to determine whether increasing the Ti6Al4V surface oxide negative charge through heat ($600^{\circ}C$) or radiofrequency plasma glow discharge (RFGD) pretreatment, with or without a subsequent coating with fibronectin, stimulated osteoblast gene marker expression in the MC3T3 osteoprogenitor cell line. Methods: Quantitative real-time polymerase chain reaction was used to measure changes over time in the mRNA levels for osteoblast gene markers, including alkaline phosphatase, bone sialoprotein, collagen type I (${\alpha}1$), osteocalcin, osteopontin and parathyroid hormone-related peptide (PTH-rP), and the osteoblast precursor genes Runx2 and osterix. Results: Osteoprogenitors began to differentiate earlier on disks that were pretreated with heat or RFGD. The pretreatments increased gene marker expression in the absence of a fibronectin coating. However, pretreatments increased osteoblast gene expression for fibronectin-coated disks more than uncoated disks, suggesting a surface oxide-mediated specific enhancement of fibronectin's bioactivity. Heat pretreatment had greater effects on the mRNA expression of genes for PTH-rP, alkaline phosphatase and osteocalcin while RFGD pretreatment had greater effects on osteopontin and bone sialoprotein gene expression. Conclusions: The results suggest that heat and RFGD pretreatments of the Ti6Al4V surface oxide stimulated osteoblast differentiation through an enhancement of (a) coated fibronectin's bioactivity and (b) the bioactivities of other serum or matrix proteins. The quantitative differences in the effects of the two pretreatments on osteoblast gene marker expression may have arisen from the unique physico-chemical characteristics of each resultant oxide surface. Therefore, engineering the Ti6Al4V surface oxide to become more negatively charged can be used to accelerate osteoblast differentiation through fibronectin-dependent and independent mechanisms.
Nine strains of xyl mutants that could not utilize xylose as a carbon source were isolated from E. coli JM109 by the treatment of NTG in order to investigate the regulation of xylose operon and to use recipient cells for the cloning of xylR gene. For the characterization of all isolated mutants, colony colors of all mutants on MacConkey-xylose and MacConkey-xylulose agar plate were observed for the utilization of xylose and xylulose, and the growth level and the activity of xylose isomerase and xylulokinase were determined in need. The isolated xylR/T mutants formed the white colony on MacConkey-xy-lose and MacConkey-xylulose agar plate. They did not detect the activity of xylose isomerase, and the activity of xylose isomerase was not restored in transformants of xylR/T mutant with pEX13 which contained xylA gene. xylR and xylT mutants were classified from xylR/T mutants depending upon the growth level in minimal medium. xylT mutants; DH13, DH121 and DH125 could grow a little in that medium, but xylR mutants; DH10, DH53, and DH60 could not grow that medium.
Cho Young-Eon;Lomeda Ria-Ann R.;Kim Yang-Ha;Ryu Sang-Hoon;Choi Je-Yong;Kim Hyo-Jin;Beattie John H.;Kwun In-Sook
Nutritional Sciences
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v.8
no.4
/
pp.242-249
/
2005
It is well established that zinc plays an important role in bone metabolism and mineralization. The role of zinc in bone formation is well documented in animal models, but not much reported in cell models. In the present study, we evaluated zinc deficiency effects on osteoblastic cell proliferation, alkaline phosphatase activity and expression, and extracellular matrix bone nodule formation and bone-related gene expression in osteoblastic MC3T3-E1 cells. To deplete cellular zinc, chelexed-FBS and interpermeable zinc chelator TPEN were used. MC3T3-E1 cells were cultured in zinc concentration-dependent (0-15 ${\mu}M\;ZnCl_2$) and time-dependent (0-20 days) manners. MC3T3-E1 cell proliferation by MTT assay was increased as medium zinc level increased (p<0.05). Cellular Ca level and alkaline phosphatase activity were increased as medium zinc level increased (p<0.05). Alkaline phosphatase expression, a marker of commitment to the osteoblast lineage, measured by alkaline phosphatase staining was increased as medium zinc level increased. Extracellular calcium deposits measured by von Kossa staining for nodule formation also appeared higher in Zn+(15 ${\mu}M\;ZnCl_2$) than in Zn-(0 ${\mu}M\;ZnCl_2$). Bone formation marker genes, alkaline phosphatase and osteocalcin, were also expressed higher in Zn+ than in Zn-. The current work supports the beneficial effect of zinc on bone mineralization and bone-related gene expression. The results also promote further study as to the molecular mechanism of zinc deficiency for bone formation and thus facilitate to design preventive strategies for zinc-deficient bone diseases.
Microseira wollei (Farlow ex Gomont) G.B.McGregor and Sendall ex Kennis, a mat-forming filamentous harmful cyanobacterium, has historically been found in the United States. Microseira wollei produces neurotoxins and hepatotoxins which affect declining water quality. In the present research, we report of unrecorded M. wollei with morphology, TEM anatomy, molecular phylogeny on the Korean population. Based on 16S rRNA gene sequences, Korean population were different by 0.02% (2 bp) to the Japanese population, 1.2-1.3% to the Australian population, and 2.5-3.7% to the United States populations. nifH gene sequences were 8.4-8.7% different to Australian ones and 3.5-3.8% to other population, however molecular phylogenetic analysis of M. wollei living in Korea revealed monophyly with the geographical populations of U.S.A., Australia, and other geographical populations. Since the mat of M. wollei has been reported to be maintained for several years in other countries, it is necessary further investigate the seasonal and regional distribution of this species in Korea.
Park, Jae-Hee;Lee, Chang-Woo;Lee, Hae-Lee;Choi, Jae Won;Choy, Yun Ho;Kwon, A-Nam;Ji, Yeoen Hee;Kim, Jong Gug
Journal of Embryo Transfer
/
v.29
no.1
/
pp.21-27
/
2014
The objective of this study was to determine the effect of the MC1R genotypes of the Chikso (Korean brindle cattle) sires on the coat colors of their offspring. In this study, 15 Chikso sires with known MC1R genotypes were used for breeding in the Gangwon Province Livestock Research Center, the Chungbuk Institute of Livestock and Veterinary Research, and the Livestock Experiment Station, Jeonbuk Institute of Livestock and Veterinary Research from either 2011 or 2012 to 2013. There were 6 sires with $E^+E^+$ genotypes and 9 sires with $E^+e$ genotypes, and their coat colors were all whole brindle (more than 50 of the body). Among the 90 calves produced in 2011~2013 or 2012~2013 from the 15 sires, 50 (55.6%) of them were females and 40 (44.4%) of them were males. Coat colors of the offspring were determined when they reached over 6 months of age. Calves with whole brindle, part brindle, brown and black coat colors were 42 (48.3%), 11 (12.6%), 18 (20.7%) and 16 (18.4%), respectively. Ratio of calves with whole brindle coat color was higher than any other coat colors. Among the offspring with whole brindle color, 20 (41.7%) calves were female and 22 (51.3%) calves were male. By determining the MC1R genotypes of the dams and calves in this study along the family lines, and investigating other genes that may be involved in the coat colors of the Chikso, better breeding system may be established to increase the brindle coat color appearance in the future.
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