• 약학회지
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• 제31권2호
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• pp.116-125
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• 1987

It is still difficult and time consuming to obtain cDNA sequences that contain the entire nucleotide sequence of the corresponding mRNA. A rapid and high efficient cloning method to obtain full-length cDNA segments is thus developed. The cloning procedure described here consists of the construction of oligo(dT)-tailed vector primer using pWR34 plasmid, polyadenylation of mRNA-cDNA heteroduplex using terminal deoxytransferase, and replacement of MRNA strand with DNA by RNase H and DNA polymerase I. The restriction endonuclease analysis shows that the size of inserted-cDNA is in the range of 1.5~4.0 kb long suggesting that most of cloned cDNA are full-length or nearly full-length cDNA. The plasmid-DNA recombinants obtained were 4$\times$$10^5$~$10^{6}$ per $\mu\textrm{g}$ of rat liver poly (A$^+$)mRNA, which is 4 to 10 fold higher cloning efficiency in comparison to the presently used methods for full-length cDNA cloning. The results indicate that the described cloning system is much simpler, less time consuming, and very efficient cloning method to construct a cDNA library.

• 한국미생물·생명공학회지
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• 제22권1호
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• pp.37-44
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• 1994

The homology among the genes coding for degradation of bipheny(BP) and 4-chlorobiphenyl(4CB) was comparatively analyzed by Southern hybridization in several BP/4CB degrading bacterial strains. As the hybridization results of their genomic DNAs with pcbABCD as the DNA probe, the group of Pseudomonas sp. DJ-12. P08 and P27 strain was separated by the group of P20 and P1242 strains. The P. pseudoalcaligenes KF707 showed the hybidization signal which was homologous to the group of DJ-12, but they had different restriction endonuclease sites. The pcbAB genes in pCUl recombinant plasmid from Pseudomonas sp. DJ-12 appeared to be homologous to pchAB genes in pKTF20 cloned from P. pseudoalcaligenes KF707, but the C genes in both strains were not homologous. The bphABC in pKTF20 showed the signals homologous to the cbp ACB in pAW6194 cloned from P. putida OU83, but homologous signal was not found botween the pcbABCD genes in pCUl and the cbpADCB genes in pAW6194 recombbinant plasmid.

• 한국응용곤충학회지
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• 제30권2호
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• pp.144-149
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• 1991

국내에서 분리된 파밤나방 핵다각체병바이러스(Spodoptera exigua nuclear polyhedrosis virus: SeNPV)의 생화학적인 특성을 규명하기 위하여 몇가지 실험을 행하였다. SeNPV는 하나의 envelopeso내에 다수의 nucleocapsid가 존재하는 MNPV(multiple embeded NPV)형태였다. 다각체단백질은 분자량 30kb의 단일 band로 나타났으며, Spodoptera litura NPV와 Bombyx mori NPV의 다각체단백질 항체에 반응하여 뚜렷한 침강선을 형성하였다. 비리온 단백질을 은염색한 결과, 많은 수의 minor band들이 포함된 49개의 band로 나타났으며, 바이러스 DNA를 분리하여 여러종의 제한효소에 의한 대략적인 genome size는 약 110kb 였다.

• 한국응용곤충학회지
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• 제34권4호
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• pp.373-377
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• 1995

전국의 토양시료로부터 3가지의 곤충목인, 나비목, 파리목, 딱정벌레목에 속하는 10종의 곤충에 대하여 독성을 보이지 않는 4종의 Bacillus thunngiensis 균주를 분리하였다. 이들 4종의 균주를 각각 NTB-1, NTB-2, NTB-3, NTB-4로 명명하였다. 취상차 현미경과 주사전자현미경을 통해 관찰된 이들 4종 균주의 내독소 단백질 형태는 모두 원형이었으며, 각 균주의 내독소 단백질과 plasmid DNA 특성을 규명하기 위해 단백질 전기영동과 제한효소 분석을 실시하였다. 그 결과 이들 균주의 내독소 단백질과 plasmid DNA pattern은 이미 알려져 있는 무독성 균주들과는 다른 양상을 보여, 기존의 무독성 균주와 다른 새로운 균주임을 알 수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제15권9호
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• pp.1237-1243
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• 2002

We have developed a reliable and noninvasive method for swine genotyping of single locus nuclear gene with aged single hair follicles delivered by general mail. The method is based on booster and nested PCR amplification with step-wise increase of primers and dNTPs concentrations followed by restriction endonuclease digestion. To establish this method, the ryanodine receptor (RYR 1) locus which is an economically important trait in swine industry was employed for genotyping experiment. The 3-step PCR amplication method is much less dependent on the quantity and quality of template DNA and produces enough amplification product for the detection on the ethidium bromide-stained gel such as RFLP analysis. A total of 120 pigs were subjected to the RYR 1 genotyping analysis using three-step PCR method which amplified enough quantity of PCR products from the aged single hair follicles for RFLP analysis and genotyping results were identical to the results of the corresponding ethanol-fixed skeletal muscle tissue. This approach will be a great help for porcine breeders and investigators in genotyping of swine. They can receive genotyping results later by simply plucking single hairs of their pigs at farm and sending them in general mail to the diagnostic laboratory which eliminates the inconveniences to collect ear tissue or blood cells from pigs, or the investigator's need for travel to farms in order to collect fresh hair samples.

• Clinical and Experimental Reproductive Medicine
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• 제50권4호
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• pp.253-261
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• 2023

Objective: Azoospermia (the total absence of sperm in the ejaculate) affects approximately 10% of infertile males. Despite diagnostic advances, azoospermia remains the most challenging issue associated with infertility treatment. Our study evaluated transition nuclear protein 2 (TNP2) and synaptonemal complex protein 3 (SYCP3) polymorphisms, azoospermia factor a (AZFa) microdeletion, and gene expression levels in 100 patients with azoospermia. Methods: We investigated a TNP2 single-nucleotide polymorphism through polymerase chain reaction (PCR) restriction fragment length polymorphism analysis using a particular endonuclease. An allele-specific PCR assay for SYCP3 was performed utilizing two forward primers and a common reverse primer in two PCR reactions. Based on the European Academy of Andrology guidelines, AZFa microdeletions were evaluated by multiplex PCR. TNP2, SYCP3, and the AZFa region main gene (DEAD-box helicase 3 and Y-linked [DDX3Y]) expression levels were assessed via quantitative PCR, and receiver operating characteristic curve analysis was used to determine the diagnostic capability of these genes. Results: The TNP2 genotyping and allelic frequency in infertile males did not differ significantly from fertile volunteers. In participants with azoospermia, the allelic frequency of the SYCP3 mutant allele (C allele) was significantly altered. Deletion of sY84 and sY86 was discovered in patients with azoospermia and oligozoospermia. Moreover, SYCP3 and DDX3Y showed decreased expression levels in the azoospermia group, and they exhibited potential as biomarkers for diagnosing azoospermia (area under the curve, 0.722 and 0.720, respectively). Conclusion: These results suggest that reduced SYCP3 and DDX3Y mRNA expression profiles in testicular tissue are associated with a higher likelihood of retrieving spermatozoa in individuals with azoospermia. The homozygous genotype TT of the SYCP3 polymorphism was significantly associated with azoospermia.

• Journal of Microbiology and Biotechnology
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• 제10권3호
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• pp.405-409
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• 2000

We have studied the genome of an obligately commensal thermophile, Symbiobacterium toebii. The chromosome was extracted from pure cultures of S. toebii recently established. Total DNA of S. toebii was resolved by pulsed-field gel electrophoresis (PFGE) into discrete numbers of fragments by digenstion with the endonuclease SspI, SpeI, XbaI, and HpaI. Estimated sizes of fragments produced by the four enzymes and their sum consistently yielded a total genome size of 2.8 Mb. Because restriction endonucleases NotI and SwaI, recognizing 8 bp, released too many fragments, these enzymes could not be used for the estimation of the genome size. Considering no mobility of undigested genome under PFGE, the genome of S. toebii appears to be circular. The presence of extrachromosomal DNA in S. toebii was excluded by the results of the conventional 1% agarose gel electrophoresis and the field inversion gel electrophoresis of undigested S. toebii DNA.

• Asian-Australasian Journal of Animal Sciences
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• 제15권7호
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• pp.938-943
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• 2002

This study was perfonned to detect polymorphisms of the two candidate genes, bovine BTN (Butyrophilin) and ST AT5a (Signal Transducers and Activators of Transcription) gene using 98 Holstein bulls' frozen semen, and to offer the basic information for QTL (Quantitative Trait Loci) analysis. Each BTN PCR product was digested with endonuclease restriction enzyme. The digested fragments of four BTN PCR products were observed as follows: 316,280, and 162 bp in BTN1, 568, 305 and 263 bp in BTN2, 576, 332, and 244 bp in BTN3, and 573, 291, and 282 bp in BTN4, respectively. The gene frequencies of A and B allele in four BTN loci were as follows: 0.8980 and 0.1020 in BTN1, 0.5510 and 0.4490 in BTN2, 0.8163 and 0.1837 in BTN3, and 0.8875 and 0.1122 in BTN4, respectively. And three genotypes (homotypel, heterotype, and homotype2) for STAT5a were observed by SSCP (single stranded conformational polymorphism) method and the genotype frequencies are 78.57%, 19.39%, and 2.04%, respectively. The PlC (Polymorphism Information Content) value and heterozygosity of four BTN loci were as follows: 0.1695 and 0.1870 in BTN1, 0.3713 and 0.4927 in BTN2, 0.2549 and 0.2999 in BTN3, and 0.1794 and 0.1992 in BTN4, respectively. Comparing with the reported data, PlC value of BTN2 might have the possibility to be useful marker. Other BTN loci indicated skewed allele distribution.

• 한국잠사곤충학회지
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• 제38권1호
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• pp.36-41
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• 1996

AcNPV 와 BmNPV의 배양세포주에서의 동시감염에 의해 선발된 재조합 바이러스 RecS-A6는 그 다각체 외부 형태가 모바이러스와 다를뿐만 아니라 배양 세포주에 따라서도 그 형태에 차이가 있었다. 이러한 다각체의 특징적인 형태가 나타나는 요인을 다각체 단백질 유전자를 중심으로 조사한 결과 RecS-A6는 AcNPV 와 BmNPV의 다각체 단백질 유전자를 모두 갖고 있는 것이 확인되었으며, 또한 RecS-A6의 다각체를 단백질 전기영동하여 분석한 결과 RecS-A6의 다각체를 단백질 전기영동하여 분석한 결과 AcNPV와 BmNPV의 다각체 단백질이 모두 다각체 형성에 이용되었음을 확인할 수 있었다.

• 대한바이러스학회지
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• 제27권1호
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• pp.29-37
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• 1997

To use recombinant viruses with wider host range as viral insecticides, we investigated the characteristics and pathogenicity of host range expanded recombinant viruses in insect cells. We compared host range expanded recombinant viruses, RecS-B6 and RecB-8, constructed by cotransfection of Autographa californica nuclear polyhedrosis virus (AcNPV) and Bombyx mori NPV (BmNPV), to host range expanded AcNPV, Ac-BH, by substitution of the 0.6 Kb fragment of the BmNPV helicase gene. Restriction endonuclease profiles of RecS-B6 and RecB-8 DNAs were different from those of parent viruses. Nucleotide sequence analysis of the 0.6 Kb region in the putative helicase gene of RecS-B6 and RecB-8 showed that their structures were identical to the counterpart region of BmNPV. Comparison of viral replication of these recombinant viruses in Sf-21 and BmN-4 cells showed that Ac-BH, compared to wild type viruses, replicated well in BmN-4 cells but poorly in Sf-21 cells. In contrast, RecS-B6 and RecB-8 replicated relatively well in both cells compared to parent viruses. These results may imply that random genomic recombinant viruses, RecS-B6 and RecB-8, possess better potential as viral pesticides than helicase-mediated recombinant virus, Ac-BH.