Search

Your search keyword '"Hardy, Holly"' showing total 24 results
Start Over Author "Hardy, Holly"
24 results on '"Hardy, Holly"'

2. Mutation in the intracellular chloride channel CLCC1 associated with autosomal recessive retinitis pigmentosa.

Author

Li, Lin, Jiao, Xiaodong, D'Atri, Ilaria, Ono, Fumihito, Nelson, Ralph, Chan, Chi-Chao, Nakaya, Naoki, Ma, Zhiwei, Ma, Yan, Cai, Xiaoying, Zhang, Longhua, Lin, Siying, Hameed, Abdul, Chioza, Barry A, Hardy, Holly, Arno, Gavin, Hull, Sarah, Khan, Muhammad Imran, Fasham, James, Harlalka, Gaurav V, Michaelides, Michel, Moore, Anthony T, Coban Akdemir, Zeynep Hande, Jhangiani, Shalini, Lupski, James R, Cremers, Frans PM, Qamar, Raheel, Salman, Ahmed, Chilton, John, Self, Jay, Ayyagari, Radha, Kabir, Firoz, Naeem, Muhammad Asif, Ali, Muhammad, Akram, Javed, Sieving, Paul A, Riazuddin, Sheikh, Baple, Emma L, Riazuddin, S Amer, Crosby, Andrew H, and Hejtmancik, J Fielding

Subjects
Retina, Cell Line, Cytoplasm, Animals, Mice, Knockout, Zebrafish, Humans, Mice, Retinitis Pigmentosa, Chloride Channels, Eye Proteins, Homozygote, Mutation, Missense, Asian Continental Ancestry Group, Pakistan, Retinal Rod Photoreceptor Cells, Retinal Cone Photoreceptor Cells, HEK293 Cells, Neurodegenerative, Eye Disease and Disorders of Vision, Genetics, Neurosciences, Rare Diseases, 2.1 Biological and endogenous factors, Eye, Developmental Biology
Abstract

We identified a homozygous missense alteration (c.75C>A, p.D25E) in CLCC1, encoding a presumptive intracellular chloride channel highly expressed in the retina, associated with autosomal recessive retinitis pigmentosa (arRP) in eight consanguineous families of Pakistani descent. The p.D25E alteration decreased CLCC1 channel function accompanied by accumulation of mutant protein in granules within the ER lumen, while siRNA knockdown of CLCC1 mRNA induced apoptosis in cultured ARPE-19 cells. TALEN KO in zebrafish was lethal 11 days post fertilization. The depressed electroretinogram (ERG) cone response and cone spectral sensitivity of 5 dpf KO zebrafish and reduced eye size, retinal thickness, and expression of rod and cone opsins could be rescued by injection of wild type CLCC1 mRNA. Clcc1+/- KO mice showed decreased ERGs and photoreceptor number. Together these results strongly suggest that intracellular chloride transport by CLCC1 is a critical process in maintaining retinal integrity, and CLCC1 is crucial for survival and function of retinal cells.

Published
2018

3. Cofilin and drebrin mediated regulation of the neuronal cytoskeleton in development and disease

Author

Hardy, Holly, Chilton, John, and Dawe, Helen

Subjects
616.8, cofilin, drebrin, actin, AIP-1, WDR-1 actin binding proteins, growth cone, filopodia, axon guidance, cofilin-rods, neurons, nervous system development, neurodegeneration
Abstract

The brain is a highly complex structure; neurons extend axons which follow precise paths to make connections with their targets. This extension is guided by a specialised and highly motile structure at the axon tip -the growth cone- which integrates guidance cues to steer the axon through the environment. Aberrant pathfinding is likely to result in developmental impairments causing disruption to brain functions underlying emotion learning and memory. Furthermore, pre-existing connections are constantly remodelled, the ability to do so declines with age, and can have huge impacts on quality of life and well-being. Examining how changes in growth cone behaviour triggered by external cues occurs is crucial for understanding processes in both development and disease. Controlled reorganisation of growth cone cytoskeletal components, such as actin filaments, generate membrane protrusions forming lamellipodia and filopodia. Filopodium formation is commonly associated with sensing the mechanical and chemical environment of the cell. Despite our understanding of the guidance choices that can be made, how filopodia transmit information at a molecular level leading to profound changes in morphology, motility and directionality remains largely unknown. Various actin-binding proteins regulate the number, stability and branching of filopodia. They may therefore have a key role in priming or abrogating the ability of the growth cone to respond to a given guidance cue. I have shown that the actin binding proteins drebrin and cofilin, whilst displaying opposing molecular activities on actin filaments, work synergistically in a temporally regulated manner. A fluorescent membrane marker combined with tagged cofilin and drebrin enabled accurate correlation of cofilin and drebrin dynamics with growth cone morphology and filopodial turnover in live neurons. In contrast to previous in vitro experiments, cofilin was found to enhance the effect of drebrin to promote filopodia formation in intact neurons, and that growth cone spread was significantly constrained when cofilin was knocked down. Importantly, this adds to our understanding of how the two actin binding proteins contribute to directed motility in neuronal growth cone filopodia during guidance. Furthermore, following acute treatment with low concentrations of the repulsive guidance cue semaphorin-3A, neuronal growth cones expressing cofilin displayed increased morphological complexity and filopodial stability. This suggests that traditional collapse signals may serve as pause signals allowing neurons to increase the surface area to sense the environment adequately and enable precise wiring decisions. Remodeling of the cytoskeleton is perturbed in a number of degenerative diseases including Alzheimer's, Huntington's, and Amyotrophic Lateral Sclerosis. These conditions are associated with widespread synaptic loss, resulting in memory loss, cognitive impairment, and movement disorders which leads to severe deterioration in quality of life for those afflicted in addition to wider negative socioeconomic impacts. How widespread synaptic loss occurs is poorly understood. One common characteristic is neuronal stress which can be initiated through different conditions such as neuroinflammation, energetic stress, glutamate excitotoxicity, and accumulation of misfolded proteins, all of which have been associated with perturbation of the actin cytoskeleton and the initiation of the cofilin-actin rod stress response. Dysfunction of the cytoskeleton can lead to the disruption of synaptic activity by blocking the delivery of elements such as organelles and proteins required for maintenance of the synapse. Modulating this stress response offers an approach to protecting the integrity of normal synaptic function. Actin interacting protein-1 is a conserved actin binding protein that enhances the filament disassembly activity of cofilin. I have discovered that AIP-1 has a potent ability to prevent the formation of cofilin rods which are thought to contribute to the neuronal dysfunction in several neurodegenerative disorders, even when they are treated with amyloid-β or subjected to metabolic stress. This is the first study to demonstrate a molecular mechanism for preventing rod formation in the presence of a neuronal stressor and has the potential to protect against rod formation by other stressors associated with disease such as inflammation and excitotoxicity. AIP-1 offers the exciting possibility of a means to reverse cofilin rod formation and the subsequent cytoskeletal pathology associated with dementia and has potential for therapeutic exploitation in human disease. Furthermore, it is the first study to demonstrate that AIP-1 localises to areas of rapid actin remodeling in neuronal growth cones. Exploiting the action of AIP-1 therefore represents an exciting and novel therapeutic avenue to tackle neurodegeneration.

Published
2017

5. Copy number variation of LINGO1 in familial dystonic tremor

Author

Alakbarzade, Vafa, Iype, Thomas, Chioza, Barry A., Singh, Royana, Harlalka, Gaurav V., Hardy, Holly, Sreekantan-Nair, Ajith, Proukakis, Christos, Peall, Kathryn, Clark, Lorraine N., Caswell, Richard, Lango Allen, Hana, Wakeling, Matthew, Chilton, John K., Baple, Emma L., Louis, Elan D., Warner, Thomas T., and Crosby, Andrew H.

Published
2019
Full Text
View/download PDF

6. Abstracts of the 52nd Workshop for Pediatric Research: Frankfurt, Germany. 27-28 October 2016

Author

van den Bruck, Rhea, Weil, Patrick P., Ziegenhals, Thomas, Schreiner, Philipp, Juranek, Stefan, Gödde, Daniel, Vogel, Silvia, Schuster, Frauke, Orth, Valerie, Dörner, Johannes, Pembaur, Daniel, Röper, Meike, Störkel, Stefan, Zirngibl, Hubert, Wirth, Stefan, Jenke, Andreas C. W., Postberg, Jan, Boy, Nikolas, Heringer, Jana, Haege, Gisela, Glahn, Esther M., Hoffmann, Georg F., Garbade, Sven F., Burgard, Peter, Kölker, Stefan, Chao, Cho-Ming, Yahya, Faady, Moiseenko, Alena, Shrestha, Amit, Ahmadvand, Negah, Quantius, Jennifer, Wilhelm, Jochen, El-Agha, Elie, Zimmer, Klaus-Peter, Bellusci, Saverio, Staufner, Christian, Kölker, Stefan, Prokisch, Holger, Hoffmann, Georg F., Seeliger, Stephan, Müller, Matthias, Hippe, Andreas, Steinkraus, Henrik, Wauer, Roland, Lachmann, Burkhard, Hofmann, Sigrun R., Hedrich, Christian M., Zierk, Jakob, Arzideh, Farhad, Haeckel, Rainer, Rascher, Wolfgang, Rauh, Manfred, Metzler, Markus, Thieme, Sebastian, Bandoła, Joanna, Richter, Cornelia, Ryser, Martin, Jamal, Arshad, Ashton, Michelle P., von Bonin, Malte, Kuhn, Matthias, Hedrich, Christian M., Bonifacio, Ezio, Berner, Reinhard, Brenner, Sebastian, Hammersen, Johanna, Has, Cristina, Naumann-Bartsch, Nora, Stachel, Daniel, Kiritsi, Dimitra, Söder, Stephan, Tardieu, Mathilde, Metzler, Markus, Bruckner-Tuderman, Leena, Schneider, Holm, Bohne, F., Langer, D., Cencic, R., Eggermann, T., Zechner, U., Pelletier, J., Zepp, F., Enklaar, T., Prawitt, D., Pech, Martin, Weckmann, Markus, Heinsen, Femke-Anouska, Franke, Andre, Happle, Christine, Dittrich, Anna-Maria, Hansen, Gesine, Fuchs, Oliver, von Mutius, Erika, Oliver, Brian G., Kopp, Matthias V., Paret, Claudia, Russo, Alexandra, Theruvath, Johanna, Keller, Bettina, El Malki, Khalifa, Lehmann, Nadine, Wingerter, Arthur, Neu, Marie A., Aslihan, Gerhold-Ay, Wagner, Wolfgang, Sommer, Clemens, Pietsch, Torsten, Seidmann, Larissa, Faber, Jörg, Schreiner, Felix, Ackermann, Merle, Michalik, Michael, Rother, Eva, Bilkei-Gorzo, Andras, Racz, Ildiko, Bindila, Laura, Lutz, Beat, Dötsch, Jörg, Zimmer, Andreas, Woelfle, Joachim, Fischer, Hendrik S., Ullrich, Tim L., Bührer, Christoph, Czernik, Christoph, Schmalisch, Gerd, Stein, Robert, Hofmann, Sigrun R., Hagenbuchner, Judith, Kiechl-Kohlendorfer, Ursula, Obexer, Petra, Ausserlechner, Michael J., Loges, Niki T., Frommer, Adrien Tobias, Wallmeier, Julia, Omran, Heymut, Öner-Sieben, Soner, Gimpfl, Martina, Rozman, Jan, Irmler, Martin, Beckers, Johannes, De Angelis, Martin Hrabe, Roscher, Adelbert, Wolf, Eckhard, Ensenauer, Regina, Nemes, Karolina, Frühwald, Michael, Hasselblatt, Martin, Siebert, Reiner, Kordes, Uwe, Kool, Marcel, Wang, Haicui, Hardy, Holly, Refai, Osama, Barwick, Katy E. S., Zimmerman, Holly H., Weis, Joachim, Baple, Emma L., Crosby, Andrew H., Cirak, Sebahattin, Hellmuth, C., Uhl, O., Standl, M., Heinrich, J., Thiering, E., Koletzko, B., Blümel, Lena, Kerl, Kornelius, Picard, Daniel, Frühwald, Michael C., Liebau, Max C., Reifenberger, Guido, Borkhardt, Arndt, Hasselblatt, Martin, Remke, Marc, Tews, D., Wabitsch, M., Fischer-Posovszky, P., Westhoff, Mike-Andrew, Nonnenmacher, Lisa, Langhans, Julia, Schneele, Lukas, Trenkler, Nancy, and Debatin, Klaus-Michael

Published
2017
Full Text
View/download PDF

8. Choline transporter mutations in severe congenital myasthenic syndrome disrupt transporter localization

Author

Wang, Haicui, Salter, Claire G, Refai, Osama, Hardy, Holly, Barwick, Katy E S, Akpulat, Ugur, Kvarnung, Malin, Chioza, Barry A, Harlalka, Gaurav, Taylan, Fulya, Sejersen, Thomas, Wright, Jane, Zimmerman, Holly H, Karakaya, Mert, Stüve, Burkhardt, Weis, Joachim, Schara, Ulrike, Russell, Mark A, Abdul-Rahman, Omar A, Chilton, John, Blakely, Randy D, Baple, Emma L, Cirak, Sebahattin, and Crosby, Andrew H

Published
2017
Full Text
View/download PDF

11. Truncating SLC5A7 mutations underlie a spectrum of dominant hereditary motor neuropathies

Author

Salter, Claire G., Beijer, Danique, Hardy, Holly, Barwick, Katy E. S., Bower, Matthew, Mademan, Inès, De Jonghe, Peter, Deconinck, Tine, Russell, Mark A., McEntagart, Meriel M., Chioza, Barry A., Blakely, Randy D., Chilton, John K., De Bleecker, Jan, Baets, Jonathan, Baple, Emma L., Walk, David, and Crosby, Andrew H.

Subjects
CONGENITAL MYASTHENIC SYNDROMES, Medicine and Health Sciences, LOCALIZATION, Human medicine, AFFINITY CHOLINE TRANSPORTER, NEUROMUSCULAR-JUNCTION
Abstract

Objective : To identify the genetic cause of disease in 2 previously unreported families with forms of distal hereditary motor neuropathies (dHMNs). Methods : The first family comprises individuals affected by dHMN type V, which lacks the cardinal clinical feature of vocal cord paralysis characteristic of dHMN-VII observed in the second family. Next-generation sequencing was performed on the proband of each family. Variants were annotated and filtered, initially focusing on genes associated with neuropathy. Candidate variants were further investigated and confirmed by dideoxy sequence analysis and cosegregation studies. Thorough patient phenotyping was completed, comprising clinical history, examination, and neurologic investigation. Results : dHMNs are a heterogeneous group of peripheral motor neuron disorders characterized by length-dependent neuropathy and progressive distal limb muscle weakness and wasting. We previously reported a dominant-negative frameshift mutation located in the concluding exon of the SLC5A7 gene encoding the choline transporter (CHT), leading to protein truncation, as the likely cause of dominantly-inherited dHMN-VII in an extended UK family. In this study, our genetic studies identified distinct heterozygous frameshift mutations located in the last coding exon of SLC5A7, predicted to result in the truncation of the CHT C-terminus, as the likely cause of the condition in each family. Conclusions : This study corroborates C-terminal CHT truncation as a cause of autosomal dominant dHMN, confirming upper limb predominating over lower limb involvement, and broadening the clinical spectrum arising from CHT malfunction.

Published
2018

14. Cover Image

Author

Ketschek, Andrea, primary, Spillane, Mirela, additional, Dun, Xin‐Peng, additional, Hardy, Holly, additional, Chilton, John, additional, and Gallo, Gianluca, additional

Published
2016
Full Text
View/download PDF

16. Choline transporter mutations in severe congenital myasthenic syndrome disrupt transporter localization.

Author

Haicui Wang, Salter, Claire G., Refai, Osama, Hardy, Holly, Barwick, Katy E. S., Akpulat, Ugur, Kvarnung, Malin, Chioza, Barry A., Harlalka, Gaurav, Taylan, Fulya, Sejersen, Thomas, Wright, Jane, Zimmerman, Holly H., Karakaya, Mert, Stüve, Burkhardt, Weis, Joachim, Schara, Ulrike, Russell, Mark A., Abdul-Rahman, Omar A., and Chilton, John

Subjects
CONGENITAL myasthenic syndromes, MYONEURAL junction, GENETIC mutation, CEREBRAL atrophy, CAENORHABDITIS elegans genetics, ANIMALS, BIOLOGICAL transport, BRAIN, EPITHELIAL cells, GENEALOGY, GENETIC techniques, MYASTHENIA gravis, NEMATODES, NERVOUS system, NEURONS, PROTEINS, RESEARCH funding, TRANSGENIC animals, ATROPHY, ION transport (Biology), MEMBRANE transport proteins, GENOTYPES
Abstract

The presynaptic, high-affinity choline transporter is a critical determinant of signalling by the neurotransmitter acetylcholine at both central and peripheral cholinergic synapses, including the neuromuscular junction. Here we describe an autosomal recessive presynaptic congenital myasthenic syndrome presenting with a broad clinical phenotype due to homozygous choline transporter missense mutations. The clinical phenotype ranges from the classical presentation of a congenital myasthenic syndrome in one patient (p.Pro210Leu), to severe neurodevelopmental delay with brain atrophy (p.Ser94Arg) and extend the clinical outcomes to a more severe spectrum with infantile lethality (p.Val112Glu). Cells transfected with mutant transporter construct revealed a virtually complete loss of transport activity that was paralleled by a reduction in transporter cell surface expression. Consistent with these findings, studies to determine the impact of gene mutations on the trafficking of the Caenorhabditis elegans choline transporter orthologue revealed deficits in transporter export to axons and nerve terminals. These findings contrast with our previous findings in autosomal dominant distal hereditary motor neuropathy of a dominant-negative frameshift mutation at the C-terminus of choline transporter that was associated with significantly reduced, but not completely abrogated choline transporter function. Together our findings define divergent neuropathological outcomes arising from different classes of choline transporter mutation with distinct disease processes and modes of inheritance. These findings underscore the essential role played by the choline transporter in sustaining acetylcholine neurotransmission at both central and neuromuscular synapses, with important implications for treatment and drug selection. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

19. Voice of the future

Author

Hardy, Holly

Subjects
Insurance industry -- Officials and employees, Company business management, Insurance industry, Insurance
Abstract

Holly Hardy, claims settlement team and policyholder indemnity team leader, Covea Insurance Post talks to talented newcomers about what attracted them to insurance What was your view of the industry [...]

Published
2014

20. Calcium Signalling and Regulation of Cell Function

Author

Bootman, Martin D, primary, Rietdorf, Katja, additional, Hardy, Holly, additional, Dautova, Yana, additional, Corps, Elaine, additional, Pierro, Cristina, additional, Stapleton, Eloise, additional, Kang, Esther, additional, and Proudfoot, Diane, additional

Published
2012
Full Text
View/download PDF

22. Truncating SLC5A7 mutations underlie a spectrum of dominant hereditary motor neuropathies.

Author

Salter CG, Beijer D, Hardy H, Barwick KES, Bower M, Mademan I, De Jonghe P, Deconinck T, Russell MA, McEntagart MM, Chioza BA, Blakely RD, Chilton JK, De Bleecker J, Baets J, Baple EL, Walk D, and Crosby AH

Abstract

Objective: To identify the genetic cause of disease in 2 previously unreported families with forms of distal hereditary motor neuropathies (dHMNs)., Methods: The first family comprises individuals affected by dHMN type V, which lacks the cardinal clinical feature of vocal cord paralysis characteristic of dHMN-VII observed in the second family. Next-generation sequencing was performed on the proband of each family. Variants were annotated and filtered, initially focusing on genes associated with neuropathy. Candidate variants were further investigated and confirmed by dideoxy sequence analysis and cosegregation studies. Thorough patient phenotyping was completed, comprising clinical history, examination, and neurologic investigation., Results: dHMNs are a heterogeneous group of peripheral motor neuron disorders characterized by length-dependent neuropathy and progressive distal limb muscle weakness and wasting. We previously reported a dominant-negative frameshift mutation located in the concluding exon of the SLC5A7 gene encoding the choline transporter (CHT), leading to protein truncation, as the likely cause of dominantly-inherited dHMN-VII in an extended UK family. In this study, our genetic studies identified distinct heterozygous frameshift mutations located in the last coding exon of SLC5A7 , predicted to result in the truncation of the CHT C-terminus, as the likely cause of the condition in each family., Conclusions: This study corroborates C-terminal CHT truncation as a cause of autosomal dominant dHMN, confirming upper limb predominating over lower limb involvement, and broadening the clinical spectrum arising from CHT malfunction.

Published
2018
Full Text
View/download PDF

24. Viewpoint: Mind the gap.

Author

Sabey A and Hardy H

Subjects
Social Welfare, United Kingdom, General Practice organization & administration, Health Care Reform, State Medicine organization & administration
Published
2012
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results