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Showing 1 to 20 of 22 for “"mating type"”.
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Novel mutations of the A mating-type idiomorph in Neurospora crassa
The mating-type idiomorphs of Neurospora crassa, A and a, function in the sexual cycle to initiate mating and meiosis (A x a is fertile) and during vegetative growth to prevent heterokaryosis (A + a is incompatible). The A and a idiomorphs encodeputative regulatory polypeptides of 288 amino acids …
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Sex in Cryptococcus: Signaling, Mating-type Locus Evolution and Gene Silencing
… sex-specific region in the genome called the mating-type locus (MAT). In the basidiomycetous yeast Cryptococcus neoformans, the pathogen that causes cryptococcal meningitis and cryptococcosis, sex has been associated with virulence. To further understand how sex is genetically regulated in C. …
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Homothallism in the Sordariaceae : Mating-type loci in selected species of Neurospora, Anixiella, and Gelasinospora
The mating-type genes in Neurospora crassa, called "idiomorphs" and designated A and "a", control entry into the sexual cycle and aspects of meiosis. In heterothallic species, nuclei with unlike mating-types must come together before karyogamy and meiosis can occur. Homothallic species, however, …
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Multi-Step Trafficking Pathway for Regulation of the Protein Composition of the Chlamydomonas Flagellar Membrane during Cilium-Generated Signaling
… is a signaling organelle found on most cell types in vertebrates. It is a distinct compartment for membrane and cytoplasmic proteins that mediate multiple sensory processes. Little is known about the cellular and molecular mechanisms that determine regulated ciliary localization of membrane …
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Die frühe Infektionsphase von Ustilago maydis
… dikaryon. This process is controlled by the two mating type loci a and b. The a-locus encodes a biallelic pheromone/pheromone receptor system which is responsible for cell-cell recognition and fusion of the sporidia. The subsequent pathogenic development is controlled by the multiallelic b-locus, …
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Nuclear Transformation of Chlamydomonas Reinhardtii to Allow for Studies on Circadian Expression of the β-Tubulin Gene
… Autolysin had been harvested successfully during mating of two different mating type strains, the optimal antibiotic concentration in the selection medium had been determined and other components of the transformation process were optimized. In successful transformations, a rate of 300 colonies …
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Characterization of the histone deacetylation activity of the yeast silencing gene SIR2
… the gene SIR2 is crucial for silencing at the HM mating type loci, the telomeres, and the rDNA array. It is also necessary for maintaining a hypoacetylated state of the histones at these locations. To silence genes, the Sir2 protein can deacetylate histones in the presence of NAD+. This is shown …
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Factors regulating transitions among life cycle phases in the marine pennate diatom <i>Pseudo-nitzschia multistriata</i>
… has a heterothallic life cycle and the two mating types ('+' and '-') need to be in contact to allow sexual reproduction to occur. In this thesis, results 'are presented of an investigation using con focal and time lapse microscopy aimed at describing the different stages of the life cycle …
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The changing <em>Phytophthora infestans</em> population: implications for late blight epidemics and control
… a dramatic increase in the proportion of the A2 mating type due to genotype 13_A2 and concerns have been raised about whether this population change affects the reliability of the UK late blight forecasting system. The Smith Period is commonly used in the UK to predict blight risk on the basis of …
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Stenocarpella Maydis: Identification, Management, and Population Diversity
… no sexual reproduction has been reported, both mating type genes, Mat1-1 and Mat1-2 were identified and amplified across 60 selected isolates.</p>
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Investigation of factors involved in RNAi-mediated heterochromatic silencing in Schizosaccharomyces pombe
… formation at centromeric repeats and at the mating-type locus. My findings suggest that Mkt1 could act in an RNA surveillance pathway, thus linking RNA metabolism with the establishment of heterochromatic silencing.
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Genetic analyses of food consumption in growth selected lines of chickens \
… on feed:water ratios was dependent upon mating type. The amount of feed introduced into the crop of chicks from the high-weight line via overfeeding was similar to their ad libitum intake. Chicks from the low-weight line could be overfed at earlier ages and to a greater degree than either …
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Genetics of initial imprinting responses: selection, and heterosis
… tendencies. Time of day tested, sex, hatch, mating type, developmental age, and 24-hr body we1ght were considered independent variables influencing the behavior traits. Multiple regressions showed that the initiation of responsiveness is not predictable. However, once a chick responded, its …
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Using Single-Cell Analyses to Uncover Transcriptional Heterogeneity in Plasmodium falciparum
… programs related to sexual commitment and mating-type determination. Furthermore, discrete changes that occur in these cells are largely undetectable in traditional bulk-cell analyses. Bulk-cell analyses were used to establish models for synchronous stage-specific transcriptional …
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HIF-2: Standing Guard at the Crossroads of Stress and Aging
… enzyme Sirtuin 1, also known as Sirt1 or silent mating type information regulator 2 (Sir2) homolog 1, selectively stimulates HIF-2 alpha signaling during hypoxia. In lower organisms and cell culture models, the FoxO family of transcription factor regulates the transcription of SOD2 and other …
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Heritability and repeatability estimates of first service conception and first cycle calving in Angus cattle
… In addition, given the nature of the phenotypes, heritability estimates of fertility traits are generally low, suggesting minimal genetic influence and therefore slow rates of genetic gain. First service conception (FSC) is a binary trait that describes the outcome of the first service of …
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Biochemical purification and functional characterization of the She RNP complex from S. cerevisiae
… to cytokinesis and is a prerequisite for proper mating type switching. In a genetic screen 5 SHE (for 'Swi5p-dependent HO expression') genes have been isolated, coding for proteins required for the RNA localization process. SHE1 is equivalent to MYO4, a locus that encodes a member of the class V …
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New Species and Phylogeny of the Genus Phytophthora
… of P. mississippiae are A1. When paired with A2 mating type testers, P. mississippiae produces ornamented oogonia and amphigynous antheridia. It is phylogenetically grouped in Phytophthora subclade 6b based on sequences of the rRNA internal transcribed spacer (ITS) region and the mitochondrially …
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Sexual Reproduction and Signal Transduction in the Candida Species Complex
… We start by examining the structure of the mating type locus (<em>MAT</em>) of two sexual species <em>C. lusitaniae</em> and <em>C. guilliermondii</em>. Interestingly, both species are missing either one or two (respectively) canonical transcription factors suggesting that the control of …
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Genotypic characterization and fungicide resistance monitoring for Virginia populations of Parastagonospora nodorum in wheat
Stagonospora nodorum blotch (SNB), is a major foliar disease of wheat in the mid-Atlantic U.S., is caused by the necrotrophic fungus Parastagonospora nodorum. SNB is managed using cultural practices, resistant varieties, and foliar fungicides. There are increasing trends of severity and incidence …
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