Journal articles
Hu X, Xiao W, Lei Y, Green A, Lee X, Maradana MR, Gao Y, Xie X, Wang R, Chennell G, et al (2023). Aryl hydrocarbon receptor utilises cellular zinc signals to maintain the gut epithelial barrier.
Nature Communications,
14(1).
Abstract:
Aryl hydrocarbon receptor utilises cellular zinc signals to maintain the gut epithelial barrier
AbstractZinc and plant-derived ligands of the aryl hydrocarbon receptor (AHR) are dietary components affecting intestinal epithelial barrier function. Here, we explore whether zinc and the AHR pathway are linked. We show that dietary supplementation with an AHR pre-ligand offers protection against inflammatory bowel disease in a mouse model while protection fails in mice lacking AHR in the intestinal epithelium. AHR agonist treatment is also ineffective in mice fed zinc depleted diet. In human ileum organoids and Caco-2 cells, AHR activation increases total cellular zinc and cytosolic free Zn2+ concentrations through transcription of genes for zinc importers. Tight junction proteins are upregulated through zinc inhibition of nuclear factor kappa-light-chain-enhancer and calpain activity. Our data show that AHR activation by plant-derived dietary ligands improves gut barrier function at least partly via zinc-dependent cellular pathways, suggesting that combined dietary supplementation with AHR ligands and zinc might be effective in preventing inflammatory gut disorders.
Abstract.
Donovan APA, Rosko L, Ellegood J, Redhead Y, Green JBA, Lerch JP, Huang JKK, Basson MA (2023). Pervasive cortical and white matter anomalies in a mouse model for CHARGE syndrome.
JOURNAL OF ANATOMY,
243(1), 51-65.
Author URL.
Kerschbamer E, Arnoldi M, Tripathi T, Pellegrini M, Maturi S, Erdin S, Salviato E, Di Leva F, Sebestyen E, Dassi E, et al (2022). CHD8 suppression impacts on histone H3 lysine 36 trimethylation and alters RNA alternative splicing.
NUCLEIC ACIDS RESEARCH,
50(22), 12809-12828.
Author URL.
Oates S, Absoud M, Goyal S, Bayley S, Baulcomb J, Sims A, Riddett A, Allis K, Brasch-Andersen C, Balasubramanian M, et al (2021). <i>ZMYND11</i> variants are a novel cause of centrotemporal and generalised epilepsies with neurodevelopmental disorder.
CLINICAL GENETICS,
100(4), 412-429.
Author URL.
Whittaker DE, Oleari R, Gregory LC, Le Quesne-Stabej P, Williams HJ, Torpiano JG, Formosa N, Cachia MJ, Field D, Lettieri A, et al (2021). A recessive <i>PRDM13</i> mutation results in congenital hypogonadotropic hypogonadism and cerebellar hypoplasia.
JOURNAL OF CLINICAL INVESTIGATION,
131(24).
Author URL.
Zerbi V, Pagani M, Markicevic M, Matteoli M, Pozzi D, Fagiolini M, Bozzi Y, Galbusera A, Scattoni M, Provenzano G, et al (2021). Brain mapping across 16 autism mouse models reveals a spectrum of functional connectivity subtypes.
MOLECULAR PSYCHIATRY,
26(12), 7610-7620.
Author URL.
Ellingford RA, Panasiuk MJ, de Meritens ER, Shaunak R, Naybour L, Browne L, Basson MA, Andreae LC (2021). Cell-type-specific synaptic imbalance and disrupted homeostatic plasticity in cortical circuits of ASD-associated <i>Chd8</i> haploinsufficient mice.
MOLECULAR PSYCHIATRY,
26(7), 3614-3624.
Author URL.
Hurley S, Mohan C, Suetterlin P, Ellingford R, Riegman KLH, Ellegood J, Caruso A, Michetti C, Brock O, Evans R, et al (2021). Distinct, dosage-sensitive requirements for the autism-associated factor CHD8 during cortical development.
MOLECULAR AUTISM,
12(1).
Author URL.
Gileadi TE, Swamy AK, Hore Z, Horswell S, Ellegood J, Mohan C, Mizuno K, Lundebye A-K, Giese KP, Stockinger B, et al (2021). Effects of Low-Dose Gestational TCDD Exposure on Behavior and on Hippocampal Neuron Morphology and Gene Expression in Mice.
ENVIRONMENTAL HEALTH PERSPECTIVES,
129(5).
Author URL.
Badodi S, Pomella N, Zhang X, Rosser G, Whittingham J, Niklison-Chirou MV, Lim YM, Brandner S, Morrison G, Pollard SM, et al (2021). Inositol treatment inhibits medulloblastoma through suppression of epigenetic-driven metabolic adaptation.
NATURE COMMUNICATIONS,
12(1).
Author URL.
Ahmed M, Moon R, Prajapati RS, James E, Basson MA, Streit A (2021). The chromatin remodelling factor Chd7 protects auditory neurons and sensory hair cells from stress-induced degeneration.
COMMUNICATIONS BIOLOGY,
4(1).
Author URL.
Kelly E, Meng F, Fujita H, Morgado F, Kazemi Y, Rice LC, Ren C, Escamilla CO, Gibson JM, Sajadi S, et al (2020). Regulation of autism-relevant behaviors by cerebellar-prefrontal cortical circuits.
Nat Neurosci,
23(9), 1102-1110.
Abstract:
Regulation of autism-relevant behaviors by cerebellar-prefrontal cortical circuits.
Cerebellar dysfunction has been demonstrated in autism spectrum disorders (ASDs); however, the circuits underlying cerebellar contributions to ASD-relevant behaviors remain unknown. In this study, we demonstrated functional connectivity between the cerebellum and the medial prefrontal cortex (mPFC) in mice; showed that the mPFC mediates cerebellum-regulated social and repetitive/inflexible behaviors; and showed disruptions in connectivity between these regions in multiple mouse models of ASD-linked genes and in individuals with ASD. We delineated a circuit from cerebellar cortical areas Right crus 1 (Rcrus1) and posterior vermis through the cerebellar nuclei and ventromedial thalamus and culminating in the mPFC. Modulation of this circuit induced social deficits and repetitive behaviors, whereas activation of Purkinje cells (PCs) in Rcrus1 and posterior vermis improved social preference impairments and repetitive/inflexible behaviors, respectively, in male PC-Tsc1 mutant mice. These data raise the possibility that these circuits might provide neuromodulatory targets for the treatment of ASD.
Abstract.
Author URL.
Saric N, Selby M, Ramaswamy V, Kool M, Stockinger B, Hogstrand C, Williamson D, Marino S, Taylor MD, Clifford SC, et al (2020). The AHR pathway represses TGFβ-SMAD3 signalling and has a potent tumour suppressive role in SHH medulloblastoma.
SCIENTIFIC REPORTS,
10(1).
Author URL.
Gutierrez-Barragan D, Basson MA, Panzeri S, Gozzi A (2019). Infraslow State Fluctuations Govern Spontaneous fMRI Network Dynamics.
CURRENT BIOLOGY,
29(14), 2295-+.
Author URL.
Vaquero M, Cuesta S, Anerillas C, Altes G, Ribera J, Basson MA, Licht JD, Egea J, Encinas M (2019). Sprouty1 Controls Genitourinary Development via its N-Terminal Tyrosine.
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY,
30(8), 1398-1411.
Author URL.
Suetterlin P, Hurley S, Mohan C, Riegman KLH, Pagani M, Caruso A, Ellegood J, Galbusera A, Crespo-Enriquez I, Michetti C, et al (2018). Altered Neocortical Gene Expression, Brain Overgrowth and Functional Over-Connectivity in <i>Chd8</i> Haploinsufficient Mice.
CEREBRAL CORTEX,
28(6), 2192-2206.
Author URL.
Kasah S, Oddy C, Basson MA (2018). Autism-linked CHD gene expression patterns during development predict multi-organ disease phenotypes.
JOURNAL OF ANATOMY,
233(6), 755-769.
Author URL.
Janecka M, Mill J, Basson MA, Goriely A, Spiers H, Reichenberg A, Schalkwyk L, Fernandes C (2017). Advanced paternal age effects in neurodevelopmental disorders-review of potential underlying mechanisms.
Transl Psychiatry,
7(1).
Abstract:
Advanced paternal age effects in neurodevelopmental disorders-review of potential underlying mechanisms.
Multiple epidemiological studies suggest a relationship between advanced paternal age (APA) at conception and adverse neurodevelopmental outcomes in offspring, particularly with regard to increased risk for autism and schizophrenia. Conclusive evidence about how age-related changes in paternal gametes, or age-independent behavioral traits affect neural development is still lacking. Recent evidence suggests that the origins of APA effects are likely to be multidimensional, involving both inherited predisposition and de novo events. Here we provide a review of the epidemiological and molecular findings to date. Focusing on the latter, we present the evidence for genetic and epigenetic mechanisms underpinning the association between late fatherhood and disorder in offspring. We also discuss the limitations of the APA literature. We propose that different hypotheses relating to the origins of the APA effects are not mutually exclusive. Instead, multiple mechanisms likely contribute, reflecting the etiological complexity of neurodevelopmental disorders.
Abstract.
Author URL.
Donovan APA, Yu T, Ellegood J, Riegman KLH, de Geus C, van Ravenswaaij-Arts C, Fernandes C, Lerch JP, Basson MA (2017). Cerebellar Vermis and Midbrain Hypoplasia Upon Conditional Deletion of <i>Chd7</i> from the Embryonic Mid-Hindbrain Region.
FRONTIERS IN NEUROANATOMY,
11 Author URL.
Badodi S, Dubuc A, Zhang X, Rosser G, Jaeger MDC, Kameda-Smith MM, Morrissy AS, Guilhamon P, Suetterlin P, Li X-N, et al (2017). Convergence of BMI1 and CHD7 on ERK Signaling in Medulloblastoma.
CELL REPORTS,
21(10), 2772-2784.
Author URL.
Whittaker DE, Kasah S, Donovan APA, Ellegood J, Riegman KLH, Volk HA, McGonnell I, Lerch JP, Basson MA (2017). Distinct cerebellar foliation anomalies in a <i>CHD7</i> haploinsufficient mouse model of CHARGE syndrome.
AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS,
175(4), 465-477.
Author URL.
Ahmed MU, Maurya AK, Cheng L, Jorge EC, Schubert FR, Maire P, Basson MA, Ingham PW, Dietrich S (2017). Engrailed controls epaxial-hypaxial muscle innervation and the establishment of vertebrate three-dimensional mobility.
Developmental Biology,
430(1), 90-104.
Abstract:
Engrailed controls epaxial-hypaxial muscle innervation and the establishment of vertebrate three-dimensional mobility
Chordates are characterised by contractile muscle on either side of the body that promotes movement by side-to-side undulation. In the lineage leading to modern jawed vertebrates (crown group gnathostomes), this system was refined: body muscle became segregated into distinct dorsal (epaxial) and ventral (hypaxial) components that are separately innervated by the medial and hypaxial motors column, respectively, via the dorsal and ventral ramus of the spinal nerves. This allows full three-dimensional mobility, which in turn was a key factor in their evolutionary success. How the new gnathostome system is established during embryogenesis and how it may have evolved in the ancestors of modern vertebrates is not known. Vertebrate Engrailed genes have a peculiar expression pattern as they temporarily demarcate a central domain of the developing musculature at the epaxial-hypaxial boundary. Moreover, they are the only genes known with this particular expression pattern. The aim of this study was to investigate whether Engrailed genes control epaxial-hypaxial muscle development and innervation. Investigating chick, mouse and zebrafish as major gnathostome model organisms, we found that the Engrailed expression domain was associated with the establishment of the epaxial-hypaxial boundary of muscle in all three species. Moreover, the outgrowing epaxial and hypaxial nerves orientated themselves with respect to this Engrailed domain. In the chicken, loss and gain of Engrailed function changed epaxial-hypaxial somite patterning. Importantly, in all animals studied, loss and gain of Engrailed function severely disrupted the pathfinding of the spinal motor axons, suggesting that Engrailed plays an evolutionarily conserved role in the separate innervation of vertebrate epaxial-hypaxial muscle.
Abstract.
Whittaker DE, Riegman KLH, Kasah S, Mohan C, Yu T, Sala BP, Hebaishi H, Caruso A, Marques AC, Michetti C, et al (2017). The chromatin remodeling factor CHD7 controls cerebellar development by regulating reelin expression.
JOURNAL OF CLINICAL INVESTIGATION,
127(3), 874-887.
Author URL.
Donovan APA, Basson MA (2017). The neuroanatomy of autism - a developmental perspective.
JOURNAL OF ANATOMY,
230(1), 4-15.
Author URL.
Balasooriya GI, Johnson J-A, Basson MA, Rawlins EL (2016). An FGFR1-SPRY2 Signaling Axis Limits Basal Cell Proliferation in the Steady-State Airway Epithelium.
DEVELOPMENTAL CELL,
37(1), 85-97.
Author URL.
Jones KM, Saric N, Russell JP, Andoniadou CL, Scambler PJ, Basson MA (2015). CHD7 Maintains Neural Stem Cell Quiescence and Prevents Premature Stem Cell Depletion in the Adult Hippocampus.
STEM CELLS,
33(1), 196-210.
Author URL.
Basson MA, van Ravenswaaij-Arts C (2015). Functional Insights into Chromatin Remodelling from Studies on CHARGE Syndrome.
TRENDS IN GENETICS,
31(10), 600-611.
Author URL.
Magnani D, Hasenpusch-Theil K, Benadiba C, Yu T, Basson MA, Price DJ, Lebrand C, Theil T (2014). <i>Gli3</i> Controls Corpus Callosum Formation by Positioning Midline Guideposts During Telencephalic Patterning.
CEREBRAL CORTEX,
24(1), 186-198.
Author URL.
Dyer C, Blanc E, Hanisch A, Roehl H, Otto GW, Yu T, Basson MA, Knight R (2014). A bi-modal function of Wnt signalling directs an FGF activity gradient to spatially regulate neuronal differentiation in the midbrain.
DEVELOPMENT,
141(1), 63-72.
Author URL.
Ching ST, Cunha GR, Baskin LS, Basson MA, Klein OD (2014). Coordinated activity of <i>Spry1</i> and <i>Spry2</i> is required for normal development of the external genitalia.
DEVELOPMENTAL BIOLOGY,
386(1), 1-11.
Author URL.
Jackson A, Kasah S, Mansour SL, Morrow B, Basson MA (2014). Endoderm-specific deletion of Tbx1 reveals an FGF-independent role for Tbx1 in pharyngeal apparatus morphogenesis.
Dev Dyn,
243(9), 1143-1151.
Abstract:
Endoderm-specific deletion of Tbx1 reveals an FGF-independent role for Tbx1 in pharyngeal apparatus morphogenesis.
BACKGROUND: the T-box transcription factor Tbx1, is essential for the normal development of multiple organ systems in the embryo. One of the most striking phenotypes in Tbx1-/- embryos is the failure of the caudal pharyngeal pouches to evaginate from the foregut endoderm. Despite considerable interest in the role of Tbx1 in development, the mechanisms whereby Tbx1 controls caudal pouch formation have remained elusive. In particular, the question as to how Tbx1 expression in the pharyngeal endoderm regulates pharyngeal pouch morphogenesis in the mouse embryo is not known. RESULTS: to address this question, we produced mouse embryos in which Tbx1 was specifically deleted from the pharyngeal endoderm and, as expected, embryos failed to form caudal pharyngeal pouches. To determine the molecular mechanism, we examined expression of Fgf3 and Fgf8 ligands and downstream effectors. Although Fgf8 expression is greatly reduced in Tbx1-deficient endoderm, FGF signaling levels are unaffected. Furthermore, pouch morphogenesis is only partially perturbed by the loss of both Fgf3 and Fgf8 from the endoderm, indicating that neither are required for pouch formation. CONCLUSIONS: Tbx1 deletion from the pharyngeal endoderm is sufficient to cause caudal pharyngeal arch segmentation defects by FGF-independent effectors that remain to be identified.
Abstract.
Author URL.
Clegg JM, Conway CD, Howe KM, Price DJ, Mason JO, Turnbull JE, Basson MA, Pratt T (2014). Heparan Sulfotransferases Hs6st1 and Hs2st Keep Erk in Check for Mouse Corpus Callosum Development.
JOURNAL OF NEUROSCIENCE,
34(6), 2389-2401.
Author URL.
Basson MA, Wingate RJ (2013). Congenital hypoplasia of the cerebellum: developmental causes and behavioral consequences.
FRONTIERS IN NEUROANATOMY,
7 Author URL.
Yu T, Meiners LC, Danielsen K, Wong MTY, Bowler T, Reinberg D, Scambler PJ, van Ravenswaaij-Arts CMA, Basson MA (2013). Deregulated FGF and homeotic gene expression underlies cerebellar vermis hypoplasia in CHARGE syndrome.
ELIFE,
2 Author URL.
Pitera JE, Woolf AS, Basson MA, Scambler PJ (2012). <i>Sprouty1</i> Haploinsufficiency Prevents Renal Agenesis in a Model of Fraser Syndrome.
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY,
23(11), 1790-1796.
Author URL.
Simrick S, Szumska D, Gardiner JR, Jones K, Sagar K, Morrow B, Bhattacharya S, Basson MA (2012). Biallelic expression of Tbx1 protects the embryo from developmental defects caused by increased receptor tyrosine kinase signaling.
DEVELOPMENTAL DYNAMICS,
241(8), 1310-1324.
Author URL.
Gardiner JR, Jackson AL, Gordon J, Lickert H, Manley NR, Basson MA (2012). Localised inhibition of FGF signalling in the third pharyngeal pouch is required for normal thymus and parathyroid organogenesis.
DEVELOPMENT,
139(18), 3456-3466.
Author URL.
Economou AD, Ohazama A, Porntaveetus T, Sharpe PT, Kondo S, Basson MA, Gritli-Linde A, Cobourne MT, Green JBA (2012). Periodic stripe formation by a Turing mechanism operating at growth zones in the mammalian palate.
NATURE GENETICS,
44(3), 348-U163.
Author URL.
Collins S, Waickman A, Basson A, Kupfer A, Licht JD, Horton MR, Powell JD (2012). Regulation of CD4⁺ and CD8⁺ effector responses by Sprouty-1.
PLoS One,
7(11).
Abstract:
Regulation of CD4⁺ and CD8⁺ effector responses by Sprouty-1.
TCR-induced NF-AT activation leads to the expression of both activating and inhibitory proteins. Previously, we had identified Egr-2 and Egr-3 as NF-AT-induced transcription factors which promote the inhibition of T cell activation. In this report we identify Sprouty1 as a downstream target of Egr-3. CD4⁺ T cells lacking Spry1 demonstrate enhanced proliferation and cytokine production. Likewise, Spry1(Flox/Flox) Lck Cre CD8⁺ T cells display increased cytolytic activity. Mechanistically, Spry1 acts at the level of PLC-γ promoting the inhibition of both Ca⁺⁺ induced NF-AT activation and MAP-kinase induced AP-1 activation while sparing NF-κB signaling. In vivo, mice in which Spry1 is selectively deleted in T cells demonstrate enhanced responses to a tumor vaccine and subsequently reject tumors more robustly than Wt mice. These findings suggest that targeting Spry1 might prove to be a novel means of enhancing tumor immunotherapy.
Abstract.
Author URL.
Basson MA (2012). Signaling in Cell Differentiation and Morphogenesis.
COLD SPRING HARBOR PERSPECTIVES IN BIOLOGY,
4(6).
Author URL.
Macia A, Gallel P, Vaquero M, Gou-Fabregas M, Santacana M, Maliszewska A, Robledo M, Gardiner JR, Basson MA, Matias-Guiu X, et al (2012). Sprouty1 is a candidate tumor-suppressor gene in medullary thyroid carcinoma.
ONCOGENE,
31(35), 3961-3972.
Author URL.
Chakkalakal JV, Jones KM, Basson MA, Brack AS (2012). The aged niche disrupts muscle stem cell quiescence.
NATURE,
490(7420), 355-+.
Author URL.
Mao Y, Mulvaney J, Zakaria S, Yu T, Morgan KM, Allen S, Basson MA, Francis-West P, Irvine KD (2011). Characterization of a <i>Dchs1</i> mutant mouse reveals requirements for Dchs1-Fat4 signaling during mammalian development.
DEVELOPMENT,
138(5), 947-957.
Author URL.
Porntaveetus T, Otsuka-Tanaka Y, Basson MA, Moon AM, Sharpe PT, Ohazama A (2011). Expression of fibroblast growth factors (Fgfs) in murine tooth development.
JOURNAL OF ANATOMY,
218(5), 534-543.
Author URL.
Simrick S, Lickert H, Basson MA (2011). Sprouty genes are essential for the normal development of epibranchial ganglia in the mouse embryo.
DEVELOPMENTAL BIOLOGY,
358(1), 147-155.
Author URL.
Yu T, Yaguchi Y, Echevarria D, Martinez S, Basson MA (2011). Sprouty genes prevent excessive FGF signalling in multiple cell types throughout development of the cerebellum.
DEVELOPMENT,
138(14), 2957-2968.
Author URL.
Akbulut S, Reddi AL, Aggarwal P, Ambardekar C, Canciani B, Kim MKH, Hix L, Vilimas T, Mason J, Basson MA, et al (2010). Sprouty Proteins Inhibit Receptor-mediated Activation of Phosphatidylinositol-specific Phospholipase C.
MOLECULAR BIOLOGY OF THE CELL,
21(19), 3487-3496.
Author URL.
Shea KL, Xiang W, LaPorta VS, Licht JD, Keller C, Basson MA, Brack AS (2010). Sprouty1 Regulates Reversible Quiescence of a Self-Renewing Adult Muscle Stem Cell Pool during Regeneration.
CELL STEM CELL,
6(2), 117-129.
Author URL.
Yaguchi Y, Yu T, Ahmed MU, Berry M, Mason I, Basson MA (2009). Fibroblast Growth Factor (FGF) Gene Expression in the Developing Cerebellum Suggests Multiple Roles for FGF Signaling During Cerebellar Morphogenesis and Development.
DEVELOPMENTAL DYNAMICS,
238(8), 2058-2072.
Author URL.
Randall V, McCue K, Roberts C, Kyriakopoulou V, Beddow S, Barrett AN, Vitelli F, Prescott K, Shaw-Smith C, Devriendt K, et al (2009). Great vessel development requires biallelic expression of <i>Chd7</i> and <i>Tbx1</i> in pharyngeal ectoderm in mice.
JOURNAL OF CLINICAL INVESTIGATION,
119(11), 3301-3310.
Author URL.
Rozen EJ, Schmidt H, Dolcet X, Basson MA, Jain S, Encinas M (2009). Loss of Sprouty1 Rescues Renal Agenesis Caused by Ret Mutation.
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY,
20(2), 255-259.
Author URL.
Calmont A, Ivins S, Van Bueren KL, Papangeli I, Kyriakopoulou V, Andrews WD, Martin JF, Moon AM, Illingworth EA, Basson MA, et al (2009). Tbx1 controls cardiac neural crest cell migration during arch artery development by regulating <i>Gbx2</i> expression in the pharyngeal ectoderm.
DEVELOPMENT,
136(18), 3173-3183.
Author URL.
Klein OD, Lyons DB, Balooch G, Marshall GW, Basson MA, Peterka M, Boran T, Peterkova R, Martin GR (2008). An FGF signaling loop sustains the generation of differentiated progeny from stem cells in mouse incisors.
DEVELOPMENT,
135(2), 377-385.
Author URL.
Parravicini V, Field A-C, Tomlinson PD, Basson MA, Zamoyska R (2008). Itch<SUP>-/-</SUP>αβ and γδ T cells independently contribute to autoimmunity in Itchy mice.
BLOOD,
111(8), 4273-4282.
Author URL.
Thum T, Gross C, Fiedler J, Fischer T, Kissler S, Bussen M, Galuppo P, Just S, Rottbauer W, Frantz S, et al (2008). MicroRNA-21 contributes to myocardial disease by stimulating MAP kinase signalling in fibroblasts.
NATURE,
456(7224), 980-U83.
Author URL.
Basson MA, Echevarria D, Ahn CP, Sudarov A, Joyner AL, Mason IJ, Martinez S, Martin GR (2008). Specific regions within the embryonic midbrain and cerebellum require different levels of FGF signaling during development.
DEVELOPMENT,
135(5), 889-898.
Author URL.
Basson MA, Watson-Johnson J, Shakya R, Akbulut S, Hyink D, Costantini FD, Wilson PD, Mason IJ, Licht JD (2006). Branching morphogenesis of the ureteric epithelium during kidney development is coordinated by the opposing functions of GDNF and Sprouty1.
DEVELOPMENTAL BIOLOGY,
299(2), 466-477.
Author URL.
Mason JM, Morrison DJ, Basson MA, Licht JD (2006). Sprouty proteins: Multifaceted negative-feedback regulators of receptor tyrosine kinase signaling.
Trends in Cell Biology,
16(1), 45-54.
Abstract:
Sprouty proteins: Multifaceted negative-feedback regulators of receptor tyrosine kinase signaling
Receptor tyrosine kinases (RTKs) control a wide variety of processes in multicellular organisms, including proliferation, differentiation, migration and survival. Their activity is tightly controlled through the coordinated action of both positive and negative regulators that function at multiple levels of the signal transduction cascade, and at different time points within the growth-factor-induced response. When this process goes awry, the outcome can be developmental defects and malignancy. Sprouty (Spry) proteins represent a major class of ligand-inducible inhibitors of RTK-dependent signaling pathways. New biochemical and genetic evidence indicates specific roles of the Spry genes in development and multiple modes of action of the Spry proteins in regulation of the RTK-induced response. © 2005 Elsevier Ltd. All rights reserved.
Abstract.
Basson MA, Akbulut S, Watson-Johnson J, Simon R, Carroll TJ, Shakya R, Gross I, Martin GR, Lufkin T, McMahon AP, et al (2005). Sprouty1 is a critical regulator of GDNF/RET-mediated kidney induction.
Developmental Cell,
8(2), 229-239.
Abstract:
Sprouty1 is a critical regulator of GDNF/RET-mediated kidney induction
Intercellular signaling molecules and their receptors, whose expression must be tightly regulated in time and space, coordinate organogenesis. Regulators of intracellular signaling pathways provide an additional level of control. Here we report that loss of the receptor tyrosine kinase (RTK) antagonist, Sprouty1 (Spry1), causes defects in kidney development in mice. Spry1-/- embryos have supernumerary ureteric buds, resulting in the development of multiple ureters and multiplex kidneys. These defects are due to increased sensitivity of the Wolffian duct to GDNF/RET signaling, and reducing Gdnf gene dosage correspondingly rescues the Spry1 null phenotype. We conclude that the function of Spry1 is to modulate GDNF/RET signaling in the Wolffian duct, ensuring that kidney induction is restricted to a single site. These results demonstrate the importance of negative feedback regulation of RTK signaling during kidney induction and suggest that failures in feedback control may underlie some human congenital kidney malformations. Copyright © 2005 by Elsevier Inc.
Abstract.
Lin W, Jing N, Basson MA, Dierich A, Licht J, Ang SL (2005). Synergistic activity of Sef and Sprouty proteins in regulating the expression of Gbx2 in the mid-hindbrain region.
Genesis (United States),
41(3), 110-115.
Abstract:
Synergistic activity of Sef and Sprouty proteins in regulating the expression of Gbx2 in the mid-hindbrain region
Sef and Sprouty proteins function as feedback antagonists of fibroblast growth factor (Fgf) signaling in zebrafish embryos. To study the role of Sef in mice, we generated Sef homozygous mutant animals. These animals are viable and show normal expression of mid-hindbrain genes at embryonic days 8.5 and 9.5. To investigate the possibility of functional synergism between Sef and Sprouty proteins, we electroporated Sprouty2Y55A, which functions in a dominant-negative manner in tissue culture cells into the mid-hindbrain region of wildtype and Sef mutant embryos. The expression pattern of Gbx2, a downstream target of Fgf signaling, was expanded or shifted in electroporated embryos, and this effect was significantly enhanced in the Sef mutant background. Altogether, our results demonstrate that Sef and Sproutys function synergistically to regulate Gbx2 expression in the anterior hindbrain. © 2005 Wiley-Liss, Inc.
Abstract.
Zamoyska R, Basson A, Filby A, Legname G, Lovatt M, Seddon B (2003). The influence of the src-family kinases, Lck and Fyn, on T cell differentiation, survival and activation.
Immunol Rev,
191, 107-118.
Abstract:
The influence of the src-family kinases, Lck and Fyn, on T cell differentiation, survival and activation.
The src-family kinases p56lck (Lck) and p59fyn (Fyn) are expressed in T cells and are among the first signaling molecules to be activated downstream of the T cell receptor (TCR). Evidence is emerging that although closely related, these signaling molecules have discrete functions during development, maintenance and activation of peripheral T cells. For example, during thymopoiesis Lck is uniquely able to provide all the signals required for pre-TCRbeta selection, although Fyn can substitute for a subset of these. Positive selection of CD4 single-positive (SP) cells is also critically dependent on the expression of Lck but not Fyn, while differentiation of CD8 SP cells proceeds relatively efficiently in the absence of Lck. In naïve peripheral T cells either Lck or Fyn can transmit TCR-mediated survival signals, and yet only Lck is able to trigger TCR-mediated expansion signals under conditions of lymphopenia. Stimulation of naïve T cells by antigenic stimuli is also severely compromised in the absence of Lck, but more subtly impaired by the absence of Fyn. We discuss recent experiments addressing how these two src-kinase family members interface with downstream signaling pathways to regulate these diverse aspects of T cell behavior.
Abstract.
Author URL.
Basson MA, Zamoyska R (2001). Insights into T-cell development from studies using transgenic and knockout mice.
Applied Biochemistry and Biotechnology - Part B Molecular Biotechnology,
18(1), 11-23.
Abstract:
Insights into T-cell development from studies using transgenic and knockout mice
The generation of immunocompetent lymphocytes is a complex process that utilizes a multitude of cell surface receptors and intracellular signaling pathways. Moreover, specific cell-cell interactions and specialized microenvironments are required, so that purely in vitro experimental systems are limited in their ability to explain the complexity of T-cell development. In vivo models have been used extensively in the study of T-cell development. In the present review we summarize but a few of the seminal discoveries that have been made in this field using tansgenic and knockout mouse models. In addition to demonstrating the wealth of information that can be gained, we also discuss some of the present limitations of this technology. Novel advances that allow the conditional and inducible modification of the genome and knock-in mutations promise to lead to an even more rapid advancement in our knowledge of T-cell development.
Abstract.
Basson MA, Zamoyska R (2000). The CD4/CD8 lineage decision: Integration of signalling pathways.
Immunology Today,
21(10), 509-514.
Abstract:
The CD4/CD8 lineage decision: Integration of signalling pathways
An immature CD4+CD8+ thymocyte can differentiate into a functionally specialized CD4+ or CD8+ T cell. The molecular mechanisms underlying this CD4/CD8 lineage choice are poorly understood. Recent evidence suggests that thymocytes are sensitive to subtle variations in signal intensity and that lineage choice might be the consequence of the integration of signals emanating from multiple pathways.
Abstract.
Basson MA, Bommhardt U, Cole MS, Tso JY, Zamoyska R (1998). Cd3 ligation on immature thymocytes generates antagonist-like signals appropriate for CD8 lineage commitment, independently of T cell receptor specificity.
Journal of Experimental Medicine,
187(8), 1249-1260.
Abstract:
Cd3 ligation on immature thymocytes generates antagonist-like signals appropriate for CD8 lineage commitment, independently of T cell receptor specificity
The signals that direct differentiation oft cells to the CD4 or CD8 lineages in the thymus remain poorly understood. Although it has been relatively easy to direct differentiation of CD4 single positive (CD4+) cells using combinations of antibodies and pharmacological agents that mimic receptor engagements, equivalent stimuli do not induce efficient maturation of CD8+ cells. Here we report that, irrespective of the MHC-restriction specificity of the TCR, differentiation of mature CD8+ thymocytes can be induced by ligation of CD3 polypeptides on immature thymocytes with a F(ab')2 reagent (CD3fos-F(ab')2). The tyrosine phosphorylation patterns stimulated by CD3fos-F(ab')2 have been shown to resemble those delivered to mature T cells by antagonist peptides, which are known to direct positive selection of CD8+ cells, and we can show that this reagent exhibits potent antagonistic-like activity for primary T cell responses. Our results suggest a distinction in the signals that specify lineage commitment in the thymus. We present a model of thymocyte differentiation that proposes that the relative balance of signals delivered by TCR engagement and by p56(lck) activation is responsible for directing commitment to the CD8 or CD4 lineages.
Abstract.