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Institute
- Theodor-Boveri-Institut für Biowissenschaften (481) (remove)
Sonstige beteiligte Institutionen
- Institut für Tierökologie und Tropenbiologie (2)
- Boehringer Ingelheim Pharma GmbH & Co. KG (1)
- Deutsches Krebsforschungszentrum Heidelberg (1)
- ESPCI Paris (1)
- European Molecular Biology Laboratory, Heidelberg, Germany (1)
- Fachgebiet für Populationsgenomik bei Nutztieren, Universität Hohenheim (1)
- Klinische Mikrobiologie am Universitätsklinikum Erlangen (1)
- König-Ludwig-Haus, Orthopedic Clinic, Würzburg (1)
- Landesbetrieb Landwirtschaft Hessen, Bieneninstitut Kirchhain (1)
- Lehrstuhl für Tierökologie und Tropenbiologie, Universität Würzburg (1)
ResearcherID
- J-8841-2015 (1)
- N-2030-2015 (1)
EU-Project number / Contract (GA) number
- 311781 (1)
In the present study, a new gene cluster of Listeria monocytogenes EGD containing three internalin genes was identified and characterized. These genes, termed inlG, inlH and inlE, encode proteins of 490, 548 and 499 amino acids, respectively, which belong to the class of large, surface-bound internalins. Each of these proteins contains a signal peptide, two regions of repeats (Leucine-rich repeats and B repeats), an inter-repeat region and a putative cell wall anchor sequence containing the sorting motiv LPXTG. PCR analysis revealed the presence of the inlGHE gene cluster in most L. monocytogenes serotypes. A similar gene cluster termed inlC2DE localised to the same position on the chromosome was described in a different L. monocytogenes EGD isolate. Sequence comparison of the two clusters indicates that inlG is a new internalin gene, while inlH was generated by a site-specific recombination leading to an in-frame deletion which removed the 3'-terminal end of inlC2 and a 5'-portion of inlD. The genes inlG, inlH and inlE seem to be transcribed extracellularly and independent of PrfA. To study the function of the inlGHE gene cluster several in-frame deletion mutants were constructed which lack the genes of the inlGHE cluster individually or in combination with other inl genes. When tested in the mouse model, the inlGHE mutant showed a significant reduction of bacterial counts in liver and spleen in comparison to the wild type strain, indicating that the inlGHE gene cluster plays an important role in virulence of L. monocytogenes. The ability of this mutant to invade non-phagocytic cells in vitro was however two- to three-fold higher than that of the parental strain. To examine whether deletion of the single genes from the cluster has the same stimulatory effect on invasiveness as deletion of the complete gene cluster, the single in-frame deletion mutants inlG, inlH and inlE were constructed. These mutants were subsequently reverted to the wild type by introducing a copy of the corresponding intact gene into the chromosome by homologous recombination using knock-in plasmids. To determine a putative contribution of InlG, InlH and InlE in combination with other internalins to the entry of L. monocytogenes into mammalian cells, the combination mutants inlA/GHE, inlB/GHE, inlC/GHE, inlA/B/GHE, inlB/C/GHE, inlA/C and inlA/C/GHE were constructed. Transcription of the genes inlA, inlB and inlC in these mutants was studied by RT-PCR. Deletion of inlGHE enhances transcription of inlA and inlB, but not of inlC. This enhancement is not transient but can be observed at different time-points of the bacterial growth curve. Deletion of inlA also increases transcription of inlB and vice-versa. In contrast, the amounts of inlA and inlB transcripts in the single deletion mutants inlG, inlH and inlE were similar to those from the wild type.
Recent advances in the development of immunoassays and nucleic acid assays have improved the performance and increased the sensitivity of sensors that are based on biochemical recognition. The new approaches taken by researchers include detecting pathogens by detecting their nucleic acids, using new nontoxic reporter entities for generating signals, and downscaling and miniaturizing sensors to micromigration and microfluidic formats. This dissertation connects some of these successful approaches, thereby leading to the development of novel nucleic acid sensors for rapid and easy detection of pathogens. The author's goal was to develop diagnostic tools that enable investigators to detect pathogens rapidly and on site. While the sensors can be used to detect any pathogen, the author first customized them for detecting particularly Cryptosporidium parvum, a pathogen whose detection is important, yet presents many challenges. Chapter 2 of this thesis presents a novel test-strip for the detection of C. parvum. The test-strip is designed to detect nucleic acids rather than proteins or other epitopes. While test strips are commonly used for sensors based on immunological recognition, this format is very new in applications in which nucleic acids are detected. Further, to indicate the presence or absence of a specific target on the test strip, dye-entrapped, oligonucleotide-tagged liposomes are employed. Using liposomes as reporter particles has advantages over using other reporter labels, because the cavity that the phospholipidic membranes of the liposomes form can be filled with up to 106 dye molecules. By using heterobifunctional linkers liposomes can be tagged with oligonucleotides, thereby enabling their use in nucleic acid hybridization assays. The developed test-strip provides an internal control. The limit of detection is 2.7 fmol/mL with a sample volume of 30 mL. In chapter 3 the detection of nucleic acids by means of oligonucleotide-tagged liposomes is scaled down to a microfluidic assay format. Because the application of biosensors to microfluidic formats is very new in the field of analytical chemistry, the first part of this chapter is devoted to developing the design and the method to fabricate the microchip devices. The performance of the microchips is then optimized by investigating the interactions of nucleic acids and liposomes with the material the chips consist of and by passivating the surface of the chips with blocking reagents. The developed microfluidic chip enabled us to reduce the sample volume needed for one assay to 12.5 mL. The limit of detection of this assay was determined to be 0.4 fmol/mL. Chapters 4 and 5 expand on the development of the microfluidic assay. A prototype microfluidic array that is able to detect multiple analytes in a single sample simultaneously is developed. Using such an array will enable investigators to detect pathogens that occur in the same environment, for example, C. parvum and Giardia duodenalis by conducting a single test. The array's ability to perform multiple sample analysis is shown by detecting different concentrations of target nucleic acids. Further, the author developed a microfluidic chip in which interdigitated microelectrode arrays (IDAs) that consist of closely spaced microelectrodes are integrated. The IDAs facilitate electrochemical detection of cryptosporidial RNA. Electrochemical detection schemes offer benefits of technical simplicity, speed, and sensitivity. In this project liposomes are filled with electrochemically active molecules and are then utilized to generate electrochemical signals. Chapter 6 explores the feasibility of liposomes for enhancing signals derived from nucleic acid hybridization in surface plasmon resonance (SPR) spectroscopy. SPR spectroscopy offers advantages because nucleic acid hybridization can be monitored in real time and under homogeneous conditions because no washing steps are required. SPR spectroscopy is very sensitive and it can be expected that, in the future, SPR will be integrated into microfluidic nucleic acid sensors.
Listeriae are Gram positive, facultative, saprophytic bacteria capable of causing opportunistic infections in humans and animals. This thesis presents three separate lines of inquiries that can lead to the eventual convergence of a global view of Listeria as pathogen in the light of evolution, genomics, and function. First, we undertook to resolve the phylogeny of the genus Listeria with the goal of ascertaining insights into the evolution of pathogenic capability of its members. The phylogeny of Listeriae had not yet been clearly resolved due to a scarcity of phylogenetically informative characters within the 16S and 23S rRNA molecules. The genus Listeria contains six species: L. monocytogenes, L. ivanovii, L. innocua, L. seeligeri, L. welshimeri, and L. grayi; of these, L. monocytogenes and L. ivanovii are pathogenic. Pathogenicity is enabled by a 10-15Kb virulence gene cluster found in L. seeligeri, L. monocytogenes and L. ivanovii. The genetic contents of the virulence gene cluster loci, as well as some virulence-associated internalin loci were compared among the six species. Phylogenetic analysis based on a data set of nucleic acid sequences from prs, ldh, vclA, vclB, iap, 16S and 23S rRNA genes identified L. grayi as the ancestral branch of the genus. This is consistent with previous 16S and 23S rRNA findings. The remainder 5 species formed two groupings. One lineage represents L. monocytogenes and L. innocua, while the other contains L. welshimeri, L. ivanovii and L. seeligeri, with L. welshimeri forming the deepest branch within this group. Deletion breakpoints of the virulence gene cluster within L. innocua and L. welshimeri support the proposed tree. This implies that the virulence gene cluster was present in the common ancestor of L. monocytogenes, L. innocua, L. ivanovii, L. seeligeri and L. welshimeri; and that pathogenic capability has been lost in two separate events represented by L. innocua and L. welshimeri. Second, we attempted to reconstitute L. innocua of its deleted virulence gene cluster, in its original chromosomal location, from the L. monocytogenes 12 Kb virulence gene cluster. This turned out particularly difficult because of the limits of genetic tools presently available for the organism. The reconstitution was partially successful. The methods and approaches are presented, and all the components necessary to complete the constructs are at hand for both L. innocua and the parallel, positive control of L. monocytogenes mutant deleted of its virulence gene cluster. Third, the sequencing of the entire genome of L. monocytogenes EGDe was undertaken as part of an EU Consortium. Our lab was responsible for 10 per cent of the labor intensive gap-closure and annotation efforts, which I helped coordinate. General information and comparisons with sister species L. innocua and a close Gram positive relative Bacillus subtilis are presented in context. The areas I personally investigated, namely, sigma factors and stationary phase functions, are also presented. L. monocytogenes and L. innocua both possess surprisingly few sigma factors: SigA, SigB, SigH, SigL, and an extra-cytoplasmic function type sigma factor (SigECF). The stationary phase genes of L. monocytogenes is compared to the well-studied, complex, stationary phase networks of B. subtilis. This showed that while genetic competence functions may be operative in unknown circumstances, non-sporulating Listeria opted for very different approaches of regulation from B. subtilis. There is virtually no overlap of known, stationary phase genes between Listeria and Gram negative model organism E. coli.
Distinct juvenile behaviour differences, changes in adult sizes and reproductive capacity and a long reproductive period triggered the working hypothesis of two alternative life-cycle strategies favouring aestivation or immediate reproduction. The hypothesis for the life-cycles of Hyperolius nitidulus that differed from the commonly assumed reproductive strategy for this species was confirmed by the results of this study. Aestivated juveniles start to mature at the beginning of the rainy season and reproduce subsequently. Their tadpoles grow until metamorphosis and either reproduce in this same season, in which case their offspring aestivates (one year - two generations), or they delay reproduction to the following year and aestivate themselves (one year - one generation). Juveniles trying to reproduce as fast as possible will invest in growth and differentiation and show no costly adaptations to aestivation, while juveniles delaying reproduction to the following rainy season will be well adapted to dry season conditions. Indirect evidence for the existence of a second generation was found in all three investigation years: adult size decreased abruptly towards the end of the rainy season, mainly due to the arrival of very small individuals, and clutch size decreased abruptly. Also at the end of the rainy season juveniles had two behavioural types: one hiding on the ground and clearly avoiding direct sunlight and another sitting freely above ground showing higher tolerance towards dry season conditions (high air temperatures and low humidity). Skin morphology differed between the types showing many more purine crystals in a higher order in the dry-season adapted juveniles. The final proof for the existence of a second generation came with the recapture of individuals marked as juveniles when they left the pond. The 45 recaptured frogs definitely came back to the pond to reproduce during the same season in 1999. Second generation frogs (males and females) were significantly smaller than the rest of all adults and egg diameter was reduced. Clutch size did not differ significantly. It was found that females did not discriminate against second generation males when coming to the ponds to reproduce. Second generation males had a similar chance to be found in amplexus as first generation males. Indirect and direct evidence for a second generation matched very well. The sudden size decrease in adults occurred just at the time when the first marked frogs returned. The observation that freshly metamorphosed froglets were able to sit in the sun directly after leaving the water led to the assumption that the decision whether to aestivate or to reproduce already happens during the frogs' larval period. Water chemistry and the influence of light was investigated to look for the factors triggering the decision, but only contaminated water increased the number of juveniles ready for aestivation. Whether the life history polymorphism observed in Hyperolius nitidulus is due to phenotypic plasticity or genetic polymorphism is still not known. Despite this uncertainty, there is no doubt that the optimal combination of different life histories is profitable and may be a reason for the wide range and high local abundance of Hyperolius nitidulus.
The MEK5/ ERK5 kinase module is a relatively new discovered mitogen-activated protein kinase (MAPK) signalling pathway with a poorly defined physiological function. Since ERK5 and its upstream activator MEK5 are abundant in skeletal muscle a function of the cascade during muscle differentiation was examined. ERK5 becomes activated upon induction of differentiation in mouse myoblasts. The selective activation of the pathway results in promoter activation of differentiation-specific genes, such as the cdk-inhibitor p21 gene, the myosin light chain (MLC1A) gene, or an E-box containing promoter element, where myogenic basic-helix-loop-helix proteins such as MyoD or myogenin bind. Moreover, myogenic differentiation is completely blocked, when ERK5 expression is inhibited by antisense RNA. The effect can be detected also on the expression level of myogenic determination and differentiation markers such as p21, MyoD and myogenin. Another new finding is that stable expression of ERK5 in C2C12 leads to differentiation like phenotype and to increased p21 expression levels under growth conditions. These results provide first evidence that the MEK5/ERK5 MAP kinase cascade is critical for early steps of muscle cell differentiation.
The present thesis reports on four years of field research on stingless bee ecology in Sabah, Malaysia. Hereby, it was the main focus to evaluate the effect of selective logging for timber extraction on communities of bees, and to elucidate causative relationships involved in regulating bee populations. Included were background studies on resource use (3.1, 3.2, 3.3) and nesting biology (3.4) as well as comparative studies on stingless bee diversity and abundance in logged and unlogged lowland rainforest sites (4.1, 4.2). Stingless bees proved to be generalist foragers that used a large range of plant species as pollen sources. Nevertheless, different species of bees had rather distinct pollen diets, a findind that was independent of fluctuations in flowering activity in the habitat. At one particular point in time colonies of one species (Trigona collina)collected mold spores (Rhizopus sp.) as a pollen surrogate. In order to obtain low-effort estimates of meliponine pollen sources a new method was developed: Trapping of bee garbage (with funnel traps) and the quantitative analysis of pollen in garbage samples. Pollen in bee garbage reflected pollen import with a certain time lag and could therefore be used for an assessment of long-term pollen foraging (see below). The majority of stingless bee nests (275 nests of 12 species) were found in cavities in trunks or under the bases of large, living canopy trees. Nest trees mostly belonged to commercial species and were of the correct size and (partly) timber quality to warrant harvesting. It was estimated that roughly one third of stingless bee nests in an given forest area would be killed during a selective logging operation. Besides causing direct mortality, logging may also indirectly affect bee populations by reducing the availability of potential nest sites (trees). However, in a comparison of primary and differentially logged forest sites (10 to 30 years after logging) no effect of the degree of disturbance on meliponine nest density was found. Instead, the variation in nest density (0 to 16.2 nest/ha) was best explained by differences in the available floral resources (assessed by analysis of pollen in bee garbage). Bee populations in forest edge situations were favored: there was a positive correlation between nest density and the proportion of external non-forest pollen (e.g. from crop plants, road edge vegetation, mangroves) in the bees’ diet. The highest nest density was found in a site bordering the mangroves in Sandakan Bay. Here, the mangrove tree Rhizophora apiculata represented a extraordinary large fraction of the pollen volume. Presumably, external pollen sources effectively supplement bee diets at times when little flowering occurs inside the forest, thus increasing overall bee carrying-capacity. The idea of differential pollen limitation was strengthened by direct measurements of pollen import and foraging activity over a period of five months. Both were elevated in colonies in a site with high bee density. It is concluded that the abundance of stingless bees in forests in Sabah is chiefly dependent on the local availability of food resources. Hereby, bee populations strongly benefit from edge effects and increased habitat diversity. Although direct negative effects of selective logging are strongly indicated by a close association of bee nests with commercial trees, no clear effects were detected in regenerating forests ten to 30 years after logging.
The identification of NRAGE
(2001)
The inhibitor of apoptosis proteins (IAPs) have been shown to interact with a growing number of intracellular proteins and signalling pathways in order to fulfil their anti-apoptotic role. In order to investigate in detail how the avian homologue ITA interfered with both TNF induced apoptosis and the NGF mediated differentiation in PC12 cells, a two hybrid screen was performed with a PC12 library using ITA as a bait. The screen resulted in the identification of several overlapping fragments of a previously unknown gene. The complete cDNA for this gene was isolated, the analysis of which revealed a high homology with a large family of tumour antigens known as MAGE (melanoma associated antigens). This newly identified member of the MAGE family, which was later named NRAGE, exhibited some unique characteristics that suggested for the first time a role in normal cellular physiology for this protein family. MAGE proteins are usually restricted in their expression to malignant or tumour cells, however NRAGE was also expressed in terminally differentiated adult tissue. NRAGE also interacted with the human XIAP in direct two-hybrid tests. The interactions observed in yeast cells were confirmed in mammalian cell culture, employing both coimmunoprecipitation and mammalian two-hybrid methods. Moreover, the results of the coimmunoprecipitation experiments indicated that this interaction requires the RING domain. The widely studied 32D cell system was chosen to investigate the effect of NRAGE on apoptosis. NRAGE was stably transduced in 32D cells, and found to augment cell death induced by the withdrawal of Interleukin-3. One reason for this reduced cell viability in NRAGE expressing cells could be the binding of endogenous XIAP, which occurred inducibly after growth factor withdrawal. Interestingly, NRAGE was able to overcome the protection afforded to 32D cells by the exogenous expression of human Bcl-2. Thus NRAGE was identified during this research doctorate as a novel pro-apoptotic, IAP-interacting protein, able to accelerate apoptosis in a pathway independent of Bcl-2 cell protection.
The proventriculus regulates the food passage from crop to midgut. As the haemolymph provides a constantly updated indication of an insect’s nutritional state, it is assumed that the factor controlling the proventri-culus activity is to be found in the haemolymph. The purpose of this doctoral thesis was to investigate how output (metabolic rate), input (food quality and food quantity) and internal state variables (haemolymph osmolarity and haemolymph sugar titer) affect each other and which of these factors controls the activity of the proventriculus in the honeybee. Therefore free-flying foragers were trained to collect con-trolled amounts of different sugar solutions. Immediately after feeding, metabolic rates were measured over different periods of time, then crop-emptying rates and haemolymph sugar titers were measured for the same individual bees. Under all investigated conditions, both the sugar transport rates through the proventriculus and the haemolyph sugar titers depended mainly on the metabolism. For bees collecting controlled amounts of 15 per cent, 30 per cent or 50 per cent sucrose solution haemolymph trehalose, glucose and fructose titers were constant for metabolic rates from 0 to 4.5 mlCO2/h. At higher metabolic rates, trehalose concentration decreased while that of glucose and fructose increased with the exception of bees fed 15 per cent sucrose solution. As the supply of sugar from the crop via the proventriculus was sufficient to support even the highest metabolic rates, the observed pattern must result from an upper limit in the capacity of the fat body to synthesise trehalose. The maximal rate of conversion of glucose to trehalose in the fat body was therefore calculated to average 92.4 µg glucose/min. However, for bees fed 15 per cent sucrose solution both the rate of conversion of glucose to trehalose and the rate of sugar transport from the crop to the midgut were limited, causing an overall decrease in total haemolymph sugar titers for metabolic rates higher than 5 mlCO2/h. Haemolymph sucrose titers were generally low but increased with increasing metabolic rates, even though sucrose was not always detected in bees with high metabolic rates. Though foragers were able to adjust their sugar transport rates precisely to their metabolic rates, a fixed surplus of sugars was transported through the proventriculus under specific feed-ing conditions. This fixed amount of sugars increased with increasing concentration and in-creasing quantity of fed sugar solution, but decreased with progressing time after feeding. This fixed amount of sugars was independent of the metabolic rates of the bees and of the molarity and viscosity of the fed sugar solution. As long as the bees did not exhaust their crop content, the haemolymph sugar titers were unaffected by the sugar surplus, by the time after feeding, by the concentration and by the viscosity of fed sugar solution. When bees were fed pure glucose (or fructose) solutions, un-usually little fructose (or glucose) was found in the haemolymph, leading to lower total haemolymph sugar titers, while the trehalose titer remained unaffected. In order to investigate the mechanisms underlying the regulation of the honeybee proven-triculus, foraging bees were injected either with metabolisable (glucose, fructose, trehalose), or non-metabolisable sugars (sorbose). Bees reacted to injections of metabolisable sugars with reduced crop-emptying rates, but injection of non-metabolisable sugars had no influence on crop emptying. Therefore it is concluded that the proventriculus regulation is controlled by the concentration of metabolisable compounds in the haemolymph, and not by the haemo-lymph osmolarity. A period of 10min was enough to observe reduced crop emptying rates after injections. It is suggested that glucose and fructose have an effect on the proventriculus activity only via their transformation to trehalose. However, when the bees were already in-jected 5min after feeding, no response was detectable. In addition it was investigated whether the overregulation is the result of feed-forward regulation for the imminent take-off and flight. In a first experiment, we investigated whether the bees release an extra amount of sugar solution very shortly before leaving for the hive. In a second experiment, it was tested whether the distance covered by the bees might have an influence on the surplus amount released prior to the take-off. In a third experiment, it was investigated if walking bees fail to release this extra amount of sugars, as they do not have to fly. Though we were not able to demonstrate that the overregulation is the result of feed-forward regulation for the imminent take-off and flight, it is conceivable that this phenome-non is a fixed reaction in foragers that can not be modulated. To investigate whether regulated haemolymph sugar titers are also observed in honeybee foragers returning from natural food sources, their crop contents and haemolymph sugar titers were investigated. While the quantity of the collected nectar was without influence on the haemolymph sugar titers, foragers showed increasing haemolymph sugar titers of glucose, fructose and sucrose with increasing sugar concentration of the carried nectar. In contrast no relationship between crop nectar concentrations and haemolymph trehalose titers was observed. We are sure that the regulation of food passage from crop to midgut is controlled by the trehalose titer. However, under some conditions the balance between consumption and income is not numerically exact. This imprecision depends on the factors which have an impact on the foraging energetics of the bees but are independent of those without influence on the foraging energetics. Therefore we would assume that the proventriculus activity is modulated by the motivational state of the bees.
Large parts of the tropical lowland rain forests of Sabah (Malaysia) were transformed into secondary forests due to heavy logging. Additionally the remaining forest remnants are isolated from each other by large scale oil palm plantations. Biodiversity patterns and responses of the community of leaf litter ants were studied in anthropogenically disturbed habitats and primary forests of different size. In logged over forests, only 70 per cent of the species of a primary forest were present even 25 years after timber extraction. The ant communities were thinned and could be described by a lower species density producing lower species numbers and a different community composition. The similarity in species number and community composition between logged over forests of different degrees of disturbance was explained by source-sink dynamics within a heterogeneous forest matrix. Rain forest fragments displayed even higher reductions in species density, numbers and diversity due to a more pronounced thinning effect. Even forest isolates exceeding 4 000 ha in size did not support more than 50 per cent of the species of the leaf litter ant community of a contiguous primary rain forest. Additionally, an increase in tramp species was recorded with decreasing size of the forest fragments, leading to a very different community composition. Regarding the leaf litter ant community, the remaining rain forest fragments of Sabah are effectively isolated by a barrier of oil palm plantation, now stretching all over the lowlands of the east coast. Only 13 species, which belonged to the forest ant community in highly disturbed areas were collected in these plantations. Some of the 10 other species of the highly reduced ground-dwelling ant community in the plantations are known as invasive tramp species, forming large exclusive territories. Correlative evidence and a field experiment implied, that leaf litter humidity, volume and temperature affect the distribution and community composition of forest leaf litter ant species. The smaller primary forests and the most disturbed logged over forests in this study revealed higher temperatures and lower humidity levels and a reduction in leaf litter volume compared to a large primary forest or forests affected by a lower impact of timber harvesting. If the pattern for leaf litter ants is confirmed for other taxa, the implications for any efficient management design aiming to preserve the majority of the biodiversity of the country are tremendous and current concepts need rethinking.
Different transgenes that can be expressed in neurons to kill or block them were compared. Tetanus neurotoxin blocked chemical synapses very efficiently. Synapses consisting of a chemical and an electrical component were blocked more reliably by expressing a human inwardly rectifying potassium channel. To gain temporal control over neuronal function, three genetic tools have been investigated. None of the systems is without drawbacks, however, the recombination induced tetanus neurotoxin expression is a promising approach. The knowledge gained from the comparative methodological study was used to investigate the role of neurons in sensory systems in processing different sensory informations. Receptor neurons sensitive for chemical or mechanical stimuli were correlated to specific olfactory behaviors or locomotor tasks. The main topic of this thesis is the much discussed question of which neurons are involved in motion processing in the visual system of flies. Neither L2 nor L4 neurons in the first visual neuropil are essential for motion-detection. The results indicate that maybe motion is detected by the network of amacrine cells (a). The vertical motion-sensitive VS cells in the lobula plate are not necessary for behavioral responses to vertical motion. This finding implies that the lack of VS cells in the structural mutant optomotor blind is not causally related to the altered responses to motion stimuli. Other abnormalities in optomotor blind are responsible for this behavioral phenotype. This work shows the potential of the described methods in studying information processing in the Drosophila brain. Groups of neurons were correlated to complex behavioral responses and theories about information processing were tested by behavioral experiments with transgenic flies. The refinement of the genetic tools to interfere with neuronal function will make the Drosophila brain an even better model to study information processing in nervous systems.