• 제목/요약/키워드: Molecular identification

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Low Molecular Weight(LMW) RNA Profiles에 의한 젖산균의 동정 (Identification of Lactic Acid Bacteria from Meat by Low Molecular Weight(LMW) RNA Profiles)

  • 차원섭
    • 한국식품영양과학회지
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    • 제21권6호
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    • pp.681-685
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    • 1992
  • 돼지고기에서 분리한 bacteriocin 생성능이 우수한 젖산균을 동정하기 위하여 이미 알려진 몇가지 젖산균을 참고균으로 하여 10% denaturing polyacrylamide gel에 전기영동으로 전개한 5S rRNA 와 tRNA 등 150개 이하의 핵산으로 구성된 저분자량 RNA(Low Molecular Weight RNA : LMW RNA) profiles에 나타난 15~25개의 밴드 양상이 균에 따라 차이점을 보여 동정에 효과적으로 이용할 수 있었다. 새로 분리한 젖산균은 참고균과는 다른 균종이었다. APT, TSB, MRS의 3종류 다른 배지에서 배양하여도 LMW RNA profiles에는 차이가 없었으며, 겔상의 밴드 전개거리를 3개의 표준 분자량 물질을 이용하여 만든 표준곡선을 사용하여 상대핵산단위(relative nucleotide units : RNU)로 나타낸 밴드의 양상을 도표화 하는 것이 profiles를 서로 비교 하는데 편리하였다.

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임상검체에서 분리된 병원성 사상균의 분자생물학적 분석 (Molecular Analysis of Pathogenic Molds Isolated from Clinical Specimen)

  • 이장호;권계철;구선회
    • 대한임상검사과학회지
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    • 제52권3호
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    • pp.229-236
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    • 2020
  • 임상 검체에서 분리된 65개의 사상형 진균을 대상으로 연구하였다. 이 균주들은 형태학적으로 동정이 불가능한 진균, 형태학적으로 유사하여 동정이 까다로운 균주, 종(species) 수준의 동정이 요구되는 균종들이다. PCR과 염기서열분석은 ITS. DiD2, 그리고 β-tubulin 유전자를 표적 부위로 하였고, 증폭된 염기서열은 상동성 분석을 위하여 GenBank 데이터베이스의 알고리즘을 이용하여 분석하였다. 형태학적으로 속 수준의 동정이 가능한 진균은 61.5%이었고, 65주의 염기서열분석으로 62 균주는 속과 종의 동정이 가능하였다. 형태학적 검사와 염기서열분석의 결과, 속과 종이 불일치한 경우 14주(21.5%)이었고, 형태학적으로 동정이 불가능하였던 사례는 11 균주이었다. B. dermatitidis, T. marneffei, 그리고 G. argillacea 등은 염기서열분석으로 국내에서 처음으로 확인하였다. Aspergillus와 같이 흔히 분리되고 성장이 빠른 진균들의 경우에는 형태학적인 검사가 보고시간과 비용 면에서는 매우 유용한 방법이다. 분자유전학적인 검사 방법은 비용과 임상적 중요성 등을 고려하여야 하지만 분자유전학적 검사를 병행하여 신속하고 정확한 결과를 제공할 수 있다.

rpoB 염기서열 분석을 이용한 응고효소 음성 포도알세균 분자 동정 (Molecular identification of coagulase-negative staphylococci by rpoB sequence typing)

  • 성원진;김단일;김은경;고대성;노영혜;김재홍;권혁준
    • 대한수의학회지
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    • 제58권1호
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    • pp.51-55
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    • 2018
  • Bovine mastitis (BM) has resulted in enormous economic loss in the dairy industry and coagulase-negative staphylococci (CNS) have caused subclinical BM. Although VITEK 2 GP ID card (VITEK 2) has been used for CNS identification, the probability of identification varies. The rpoB sequence typing (RSTing) method has been used for molecular diagnosis and epidemiology of bacterial infections. In this study, we undertook RSTing of CNS and compared the results with those of VITEK2 and 16S rRNA gene sequencing. As compared VITEK2, the molecular-based methods were more reliable for species identification; moreover, RSTing provided more molecular epidemiological information than that from 16S rRNA gene sequencing.

Development of SCAR Markers for Korean Wheat Cultivars Identification

  • Son, Jae-Han;Kim, Kyeong-Hoon;Shin, Sanghyun;Choi, Induk;Kim, Hag-Sin;Cheong, Young-Keun;Lee, Choon-Ki;Lee, Sung-Il;Choi, Ji-Yeong;Park, Kwang-Geun;Kang, Chon-Sik
    • Plant Breeding and Biotechnology
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    • 제2권3호
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    • pp.224-230
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    • 2014
  • Amplified fragment length polymorphism (AFLP) is a molecular marker technique based on DNA and is extremely useful in detection of high polymorphism between closely related genotypes like Korean wheat cultivars. Six sequence characterized amplified regions (SCARs) have been developed from inter simple sequence repeat (ISSR) analysis which enabled the identification and differentiation of 13 Korean wheat cultivars from the other cultivars. We used six combinations of primer sets in our AFLP analysis for developing additional cultivar-specific markers in Korean wheat. Fifty-eight of the AFLP bands were isolated from EA-ACG/MA-CAC, EA-AGC/MA-CTG and EA-AGG/MA-CTA primer combinations. Of which 40 bands were selected to design SCAR primer pairs for Korean wheat cultivar identification. Three of 58 amplified primer pairs, KWSM006, KWSM007 and JkSP, enabled wheat cultivar identification. Consequently, 23 of 32 Korean wheat cultivars were classified by eight SCAR marker sets.

Current Studies on Bakanae Disease in Rice: Host Range, Molecular Identification, and Disease Management

  • Yu Na An;Chandrasekaran Murugesan;Hyowon Choi;Ki Deok Kim;Se-Chul Chun
    • Mycobiology
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    • 제51권4호
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    • pp.195-209
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    • 2023
  • The seed borne disease such as bakanae is difficult to control. Crop yield loss caused by bakanae depending on the regions and varieties grown, ranging from 3.0% to 95.4%. Bakanae is an important disease of rice worldwide and the pathogen was identified as Fusarium fujikuroi Nirenberg (teleomorph: Gibberella fujikuroi Sawada). Currently, four Fusaria (F. fujikuroi, F. proliferatum, F. verticillioides and F. andiyazi) belonging to F. fujikuroi species complex are generally known as the pathogens of bakanae. The infection occurs through both seed and soil-borne transmission. When infection occurs during the heading stage, rice seeds become contaminated. Molecular detection of pathogens of bakanae is important because identification based on morphological and biological characters could lead to incorrect species designation and time-consuming. Seed disinfection has been studied for a long time in Korea for the management of the bakanae disease of rice. As seed disinfectants have been studied to control bakanae, resistance studies to chemicals have been also conducted. Presently biological control and resistant varieties are not widely used. The detection of this pathogen is critical for seed certification and for preventing field infections. In South Korea, bakanae is designated as a regulated pathogen. To provide highly qualified rice seeds to farms, Korea Seed & Variety Service (KSVS) has been producing and distributing certified rice seeds for producing healthy rice in fields. Therefore, the objective of the study is to summarize the recent progress in molecular identification, fungicide resistance, and the management strategy of bakanae.