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INTRODUCTION
Paralichthys olivaceus is commercially important teleost species, belonging to family Paralichthyidae, order Pleuronectiformes, broadly distributed on the seashore of the Yellow Sea, southern sea and the Jeju Island of Korea, Chinese sea and Japanese sea. In the environment, the fishes inhabit the benthic flats consisting of a lot of sand and slime. Like other fishes, the rate at which the fish grows, is greatly influenced by water quality. The outer body color of this fish is yellowish and/or body color is black and grey. The color of the abdomen is yellowish brown or light white. Mainly, there are marked shifts of the fish weight, size, color and shape in P. olivaceus in keeping with the ecological surroundings of habitat such as prey, rock crystal, water temperature, feed and harsh period. The bastard halibut is environmentally and biologically very important fishes in the Korea. However, this kind of finfish, which are well-known important environmentally (Bae et al., 2017), physiologically (Kim et al., 2018), histopathologically (Kim et al., 2017), as well as aquaculturally (Lee & Yoo, 2016) are not genetically and/or molecular-biologically studied comparable other fishes. There is a necessity to understand the genetic traits and composition of this finfish population in order to evaluate exactly the patent genetic significance. PCR-based molecular research methods have been applied to study the genetic characters of various finfishes and shellfishes (Partis & Wells, 1996; Callejas & Ochando, 1998; Tassanakajon et al., 1998; Muchmore et al., 1998; McCormack et al., 2000; Zhou et al., 2000; Chenyambuga et al., 2004; Yoon & Park 2002; Islam et al., 2005; Oh & Yoon, 2014). Generally, the markers peculiar to the species, the genus or the geographical populations have been applied for the individuals and species, hybrid parentage and for the monitoring of DNA markers. Here, to clarify the Euclidean genetic distances in bastard halibut, the author undertook the clustering analyses of two geographical populations of bastard halibut (P. olivaceus) raising in the Hampyeong and Wando, respectively.
MATERIALS AND METHODS
PCR analysis was accomplished on DNA samples extracted from a total of 22 individuals using eight oligonucleotides primers. DNA extraction should be performed along with the separation and extraction methods (Yoon & Kim, 2004). 600 µL of chloroform was added to the mixture and then inverted (no phenol). After quite a few washing, the lysis buffer Ⅰ (155 mM NH4Cl; 10 mM KHCO3; 1 mM EDTA) was augmented to samples, and the mixture tubes were gently upset. The precipitates obtained were centrifuged and suspended with lysis buffer II (10 mM Tris-HCl, pH 8.0; 10 mM EDTA; 100 mM NaCl; 0.5% SDS) and added 15 µL proteinase K solution (10 mg/mL). After incubation, there was added 300 µL of 3 M NaCl and gently pipetted for a few of min. Added not phenol, 600 µL of chloroform were added to the mixture and then inverted. Ice-cold 70% EtOH was added, and then the samples were centrifuged at 19,621 g for 5 min to extract the DNA from the lysates. The concentration of the extracted genomic DNA was measured with the optical density (OD) at 260 nm by a spectrophotometer (Beckman Coulter, Buckinghamshire, UK). The DNA pellets were then incubation-dried for more than 12 hours, maintained at -70℃ until needed and then dissolved in the distilled water. The DNA amplification was performed in 25 µL containing 10 ng of template DNA, 20 µL premix (Bioneer Co., Daejeon, Korea) and the 1.0 unit primer. Amplification products were separated by 1.4% agarose (Bioneer Co., Daejeon, Korea) gel electrophoresis with TBE (90 mM Tris, pH 8.5; 90 mM borate; 2.5 mM EDTA). The 100 bp DNA ladder (Bioneer Co., Daejeon, Korea) was used as DNA molecular weight marker. The agarose gels electrophoresed were stained with ethidium bromide (Song & Yoon, 2013). The electrophoresed agarose gels were illuminated by ultraviolet rays, and photographed using a photoman direct copy system (PECA Products, Beloit, WI, USA). The oligonucleotides primer were acquired from Operon Technologies, USA. OPA-02 (5’-TGCCGAGCTG-3’), OPA-07 (5’-GAAACG GGTG-3’), OPA-18 (5’-AGGTGACCGT-3’), OPA-20 (5’-GTTGCGATCC-3’), OPB-08 (5’-GTCCACACGG-3’), OPB-09 (5’-TGGGGGACTC-3’), OPB-15 (5’-GGAGGG TGTT-3’), and OPB-17 (5’-AGGGAACGAG-3’) were displayed to yield the bandsharing values and genetic distances of the two bastard halibut populations. PCR was carried out using programmable DNA Thermal Cycler Cycler (MJ Research Inc., Waltham, MA, USA). Similarity matrix including bandsharing values between dissimilar individuals in the two P. olivaceus populations, was generated allowing formula of Jeffreys and Morton (1987) and Yoke-Kqueen and Radu (2006). A hierarchical clustering tree was accumulated using similarity matrices to yield a dendrogram, which was supported by the Systat version 10 (SPSS Inc., Chicago, IL, USA).
RESULTS AND DISCUSSION
In this study, the bandsharing value, which is based on the presence or absence of amplified fragments, was utilized to calculate similarity indices in two bastard halibut populations, as demonstrated in Table 1. Here, the complexity of the banding patterns varied dramatically between the primers from the two finfish populations. The similarity matrix, which was bas ed on the average bandsharing value of all the samples, ranged from 0.677 to 0.987 in the Hampyeong population and 0.757–0.980 to the Wando population. The bandsharing value between individuals no. 08 and no. 09 within the Hampyeong population (P. olivaceus) was 0.987, which was the highest value identified among the two populations. As regards average bandsharing value (BS) results, individuals from Hampyeong population (0.810) displayed lower bandsharing values than did individuals from Wando population (0.877). The average bandsharing value reported by this study is similar to the value ported for Spanish barbell species (0.71–0.81) (Callejas & Ochando, 1998). The average bandsharing value recorded in our study is also higher than the average value between the bullhead population (0.504± 0.115) (Yoon & Kim, 2004). In the present study, the hierarchical polar dendrogram obtained by the eight oligonucleotides primers designates two genetic clusters: cluster 1 (HAMPYEONG 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, and 11) and cluster 2 (WANDO 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, and 22) (Fig. 1). Among the twenty-two fishes, the shortest genetic distance that demonstrated significant molecular differences was between individuals fish no. 09 and no. 08 from the cluster I (genetic distance=0.018), while the longest genetic distance among the twenty-two individuals that exhibited significant molecular differences was between individuals fish no. 05 and clam no. 20 (genetic distance=0.489). Relatively, individuals of cluster I were greatly closely related to that of cluster II, as shown in the polar dendrogram of Euclidean genetic distances. The genetic distance between individuals approved the existence of close relationship in the cluster II. The values of the pairwise comparisons of unbiased genetic distance between the populations of the Indian major carp (Catla catla) from the combined data for the four primers, ranged from 0.025 to 0.052 (Islam et al., 2005). They reported that the Padma and the Jamuna populations were separated from each other with the lowest genetic distance (D= 0.025). From what has been said above, the prospective of this research method in determining the diagnostic markers for the breed, stock, species, genus and geographic population identification in teleost (Mamuris et al., 1999; Diaz-Jaimes & Uribe-Alcocer, 2003), in shellfish (Tassanakajon et al., 1998; McCormack et al., 2000; Oh & Yoon, 2014) and in livestock (Jeffreys & Morton, 1987; Gwakisa et al., 1994) has also been established. The points of a significant genetic distance between two P. olivaceus populations demonstrated this PCR means is one of the several devices for individuals and/or populations biological DNA investigates.
| Population | Hampyeong | Wando |
|---|---|---|
| Hampyeong | 0.810±0.009 a | 0.560±0.004 b |
| Wando | - | 0.877±0.007 a |
Each value is a result of three different experiments.
