scholarly journals The Syntenic Relationship of the Zebrafish and Human Genomes

2000 ◽  
Vol 10 (9) ◽  
pp. 1351-1358 ◽  
Author(s):  
W. B. Barbazuk
Keyword(s):  
Syntenic Relationship ◽  
Human Genomes ◽  
Relationship Of

HUNTINGTON GENE ONTOLOGICAL STUDY AND ORTHOLOGICAL ANALYSIS

2016 ◽  
Vol 1 (2) ◽  
pp. 65
Author(s):  
Muhammad Ilyas ◽  
Asif Mir ◽  
Sobiah Rauf ◽  
Sidrah Nazir ◽  
Humera Javed
Keyword(s):  
Neurodegenerative Disorder ◽  
Evolutionary Relationship ◽  
Causative Gene ◽  
Syntenic Relationship ◽  
Complete Penetrance ◽  
Phylogenetic Studies ◽  
Abnormal Movements ◽  
Psychiatric Disturbances ◽  
Relationship Of ◽  
Insight Into

Huntington gene is located on chromosome 4p16.3 IT15 locus considered a major causative gene of Huntington disorder. HTT is a neurodegenerative disorder mutation in gene cause abnormal movements and psychiatric disturbances. HTT is inherited in an autosomal dominant manner with almost complete penetrance and till now, no research studies provide insight into HTT gene. Bioinformatics analysis includes transcription factors binding sites, phylogenetic studies with reference to various selected orthologs and syntenic relationship of HTT gene. Our study showed that in HTT gene majority of the portion is conserved among two orthologs chimpanzee and mouse in significance to human. These studies also revealed information about conservation of genes among different ortholog species and their evolutionary relationship.

scholarly journals Syntenizer 3000: Synteny-based analysis of orthologous gene groups

2019 ◽  
Author(s):  
Camous Moslemi ◽  
Cathrine Kiel Skovbjerg ◽  
Sara Moeskjær ◽  
Stig Uggerhøj Andersen
Keyword(s):  
Sequence Similarity ◽  
Orthologous Gene ◽  
Homologous Gene ◽  
Syntenic Relationship ◽  
Gene Group ◽  
Amorphous Nature ◽  
Duplication Events ◽  
Areas Of Interest ◽  
Relationship Of

AbstractMotivationThe amorphous nature of genes combined with the prevalence of duplication events makes establishing correct genetic phylogenies challenging.Since homologous gene groups are traditionally formed on basis of sequence similarity, both orthologs and paralogs are often placed in the same gene group by existing tools. Certain tools such as PoFF take syntenic relationship of genes into consideration when forming gene groups. However, a method to form gene groups consisting of only true syntelogs has not yet been developed.In order to obtain orthologous gene groups consisting of the most likely syntelogs we need a method to filter out paralogs. If one strain has two or more copies of the same gene in a gene group we want to keep only the true syntelog in the group, and remove the paralogous copies by distinguishing between the two using synteny analysis.ResultsWe present a novel algorithm for measuring the degree of synteny shared between two genes and successfully disambiguate gene groups. This synteny measure is the basis for a number of other useful functions such as gene neighbourhood visualisation to inspect suspect gene groups, strain visualisation for assessing assembly quality and finding genomic areas of interest, and chromosome/plasmid classification of contigs in partially classified datasets.AvailabilityThe latest version of Syntenizer 3000 can be downloaded from the GitHub repository at https://github.com/kamiboy/Syntenizer3000/Consult the manual.pdf file in the repository for instructions on how to build and use the tool, as well as a in depth explanation of the algorithms utilised.

scholarly journals Development in Rice Genome Research Based on Accurate Genome Sequence

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Takashi Matsumoto ◽  
Jianzhong Wu ◽  
Baltazar A. Antonio ◽  
Takuji Sasaki
Keyword(s):  
Genome Sequence ◽  
Rice Genome ◽  
Genome Research ◽  
Syntenic Relationship ◽  
Rice Genome Sequence ◽  
Key Technology ◽  
The World ◽  
Cereal Genomes ◽  
Relationship Of ◽  
Genome Information

Rice is one of the most important crops in the world. Although genetic improvement is a key technology for the acceleration of rice breeding, a lack of genome information had restricted efforts in molecular-based breeding until the completion of the high-quality rice genome sequence, which opened new opportunities for research in various areas of genomics. The syntenic relationship of the rice genome to other cereal genomes makes the rice genome invaluable for understanding how cereal genomes function. Producing an accurate genome sequence is not an easy task, and it is becoming more important as sequence deviations among, and even within, species highlight functional or evolutionary implications for comparative genomics.

scholarly journals Using Ancient Samples in Projection Analysis

2015 ◽  
Author(s):  
Melinda A Yang ◽  
Montgomery Slatkin
Keyword(s):  
Population Model ◽  
Reference Population ◽  
Demographic Model ◽  
Ancient Sample ◽  
Human Genomes ◽  
Test Genome ◽  
Projection Analysis ◽  
The One ◽  
Relationship Of ◽  
The Relationship

Projection analysis is a useful tool for understanding the relationship of two populations. It compares a test genome to a set of genomes from a reference population. The projection's shape depends on the historical relationship of the test genome's population to the reference population. Here, we explore the effects on the projection when ancient samples are included in the analysis. First, we conduct a series of simulations in which the ancient sample is directly ancestral to a present-day population (one-population model) or the ancient sample is ancestral to a sister population that diverged before the time of sampling (two-population model). We find that there are characteristic differences between the projections for the one-population and two-population models, which indicate that the projection can be used to determine whether a test genome is directly ancestral to a present day population or not. Second, we compute projections for several published ancient genomes. We compare three Neanderthals, the Denisovan and three ancient human genomes to European, Han Chinese and Yoruba reference panels. We use a previously constructed demographic model and insert these seven ancient genomes and assess how well the observed projections are recovered.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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