• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
• /
• pp.117.2-117
• /
• 2003

The importance and diversity of the genus Stemphylium highlights the need for accurate identification of species. However, many Stemphylium isolates have been misidentified due to the use of spore size as the only identifying character. Molecular phylogenetic analyses were performed on fifty-four isolates covering 9 Stemphylium species collected in Korea. Phylogenetic analysis of the translation elongation factor -1 alpha (EF-1) and the calmodulin gene sequence data showed that Stemphylium species were segregated into seven distinct groups, most of w hichcorrelated with species identified by morphology. Analysis of EF-1 in particular was useful for establishing well- supported relationships among the species of Stemphylium.

• Molecules and Cells
• /
• 제27권1호
• /
• pp.55-66
• /
• 2009

The phylogeny of the family Tephritidae (Diptera: Tephritidae) was reconstructed from mitochondrial 12S, 16S, and COII gene fragments using 87 species, including 79 tephritid and 8 outgroup species. Minimum evolution and Bayesian trees suggested the following phylogenetic relationships: (1) A sister group relationship between Ortalotrypeta and Tachinisca, and their basal phylogenetic position within Tephritidae; (2) a sister group relationship between the tribe Acanthonevrini and Phytalmiini; (3) monophyly of Plioreocepta, Taomyia and an undescribed new genus, and their sister group relationship with the subfamily Tephritinae; (4) a possible sister group relationship of Cephalophysa and Adramini; and (5) reconfirmation of monophyly for Trypetini, Carpomyini, Tephritinae, and Dacinae. The combination of 12S, 16S, and COII data enabled resolution of phylogenetic relationships among the higher taxa of Tephritidae.

• 한국생물정보학회:학술대회논문집
• /
• 한국생물정보시스템생물학회 2005년도 BIOINFO 2005
• /
• pp.118-123
• /
• 2005

With the increasing availability of mammalian genome sequences it became possible to use large scale phylogenetic analysis in order to locate potentially functional regions. In this paper we describe a new probabilistic method for the characterization of phylogenetic conservation in mammalian DNA sequences. We have used this method for the analysis of Hox gene clusters, based on the alignment of 6 species, and we constructed a map of for indicating short and long conserved fragments and their positions with respect to the known locations of Hox genes and other elements, sometimes showing surprising layouts.

• Ocean Science Journal
• /
• 제41권4호
• /
• pp.315-318
• /
• 2006

Three Synechococcus strains were isolated from seawater near the Ieodo Ocean Research Station (IORS), and their 16S rDNA genes and the internal transcribed spacer (ITS) between the 16S and 23S rRNA genes were sequenced to investigate their phylogenetic relationships. Phylogenetic trees based on the 16S rDNA and ITS sequences showed that they clustered in the main MC-A Synechococcus group (subcluster 5.1), but formed branches differentiating them from the described clades. As the IORS is located in an area affected by diverse water masses, high Synechococcus diversity is expected in the area. Therefore, the IORS might be a good site to study the diversity, physiology, and distribution of the Synechococcus group.

• 한국산학기술학회논문지
• /
• 제9권5호
• /
• pp.1218-1224
• /
• 2008

유전자의 상위부분에 위치하면서 해당 유전자의 발현을 제어하는 신호부위 역할을 하는 프로모터 영역은 다양한 전사인자들이 결합하는 특정 신호부위들을 갖고 있다. 이러한 전사인자 결합부위들은 프로모터 영역 내의 매우 다양한 위치에 자리잡고 있으며, 진화론적으로 잘 보존된 Consensus 형태의 염기서열 패턴을 띠고 있다. 본 논문은 이러한 Consensus 패턴 탐색에 사용되는 Wataru 방법, EM 알고리즘, MEME 알고리즘, 유전자 알고리즘 및 Phylogenetic Footprinting 기법 등에 대해 소개하고, 향후 연구방향에 대한 전망을 제시하고자 한다.

• 대한수학회논문집
• /
• 제25권1호
• /
• pp.149-160
• /
• 2010

Among the distance based algorithms in phylogenetic tree reconstruction, the neighbor-joining algorithm has been a widely used and effective method. We propose a new algorithm which counts the number of consistent quartets for cherry picking with tie breaking. We show that the success rate of the new algorithm is almost equal to that of neighbor-joining. This gives an explanation of the qualitative nature of neighbor-joining and that of dissimilarity maps from DNA sequence data. Moreover, the new algorithm always reconstructs correct trees from quartet consistent dissimilarity maps.

• Fisheries and Aquatic Sciences
• /
• 제2권2호
• /
• pp.122-128
• /
• 1999

Several differences are revealed in the segmentation and setation of the antennule, maxillule, maxilliped and fifth legs between three genera of the family Metridinidae, Metridia, Pleuromamma, and Gaussia. The phylogenetic relationships are cladistically analyzed on the basis of 10 morphological characters. The cladogram shows that Gaussia and Pleuromamma form a sister group, with Metridia which is the first branch to diverge within the family. The presence Of quadritheks on the male antennules of Metridia and Pleuromamma seems to be an important synapomorphy. The loss of quadritheks in Gaussia represents likely evidence of a character reversal into the ancestral condition.

• 한국균학회지
• /
• 제33권2호
• /
• pp.92-94
• /
• 2005

동양란에 썩음병을 일으키는 병원균을 분리하여 동정하였다. 병원균은 배양학적으로나 형태학적으로 Fusarium 속의 특성을 지니고 있었고, PCR 기법을 사용한 18S rRNA 염기서열을 분석결과 Fusarium 속의 균류와 매우 높은 유사도를 보였다. 계통학적 분석결과, 본 균주는 Fusarium sp. LP-A2/3(AF548314)과 가장 근접한 것으로 나타났다.

• Mycobiology
• /
• 제44권3호
• /
• pp.131-136
• /
• 2016

Gymnopus is a cosmopolitan genus of agaric fungi and consists of ~300 species. In Korea, Gymnopus represents common saprobic mushrooms, and 12 species have been reported in Korea. Several Gymnopus specimens were collected in Korea between 2008 and 2015. To identify them exactly, phylogenetic analysis was performed by means of the internal transcribed spacer region of ribosomal-DNA sequences from the collected Gymnopus specimens. Among them, G. iocephalus, G. polygrammus, and G. subnudus have not been reported in Korea. A phylogenetic tree and images are provided.

• Journal of Microbiology
• /
• 제35권2호
• /
• pp.79-86
• /
• 1997

For the phylogenetic study of the genus Trichaptum, nuclear ribosomal DNA sequences from eight strains of four Trichaptium species were examined. Phylogenetic trees were constructed using molecular data on 18 rDNA and 5.8S rDNA and thei ITSs. Parsimony analyses of the Trichaptum species showed that T. biforme and T. laricinum made a monophyletic group respectively, suggesting that each species is phylogenetically independent. However, T. abietum represented a polyphyletic group and T. fusco-violaceum formed a polytomous group, suggesting that these species could be in the process of evolutionary differentiation. Examination of base substitutions of the 18S rRNA gene reveals that the C-T transition is most predominant and that there is a stronger transition bias between closely related organisms rather than between distantly related ones.