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Eissman JM, Archer DB, Mukherjee S, Lee ML, Choi S, Scollard P, Trittschuh EH, Mez JB, Bush WS, Kunkle BW, Naj AC, Gifford KA, Cuccaro ML, Cruchaga C, Pericak‐Vance MA, Farrer LA, Wang L, Schellenberg GD, Mayeux RP, Haines JL, Jefferson AL, Kukull WA, Keene CD, Saykin AJ, Thompson PM, Martin ER, Bennett DA, Barnes LL, Schneider JA, Crane PK, Hohman TJ, Dumitrescu L. Sex-specific genetic architecture of late-life memory performance. Alzheimers Dement 2024; 20:1250-1267. [PMID: 37984853 PMCID: PMC10917043 DOI: 10.1002/alz.13507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 08/08/2023] [Accepted: 09/07/2023] [Indexed: 11/22/2023]
Abstract
BACKGROUND Women demonstrate a memory advantage when cognitively healthy yet lose this advantage to men in Alzheimer's disease. However, the genetic underpinnings of this sex difference in memory performance remain unclear. METHODS We conducted the largest sex-aware genetic study on late-life memory to date (Nmales = 11,942; Nfemales = 15,641). Leveraging harmonized memory composite scores from four cohorts of cognitive aging and AD, we performed sex-stratified and sex-interaction genome-wide association studies in 24,216 non-Hispanic White and 3367 non-Hispanic Black participants. RESULTS We identified three sex-specific loci (rs67099044-CBLN2, rs719070-SCHIP1/IQCJ-SCHIP), including an X-chromosome locus (rs5935633-EGL6/TCEANC/OFD1), that associated with memory. Additionally, we identified heparan sulfate signaling as a sex-specific pathway and found sex-specific genetic correlations between memory and cardiovascular, immune, and education traits. DISCUSSION This study showed memory is highly and comparably heritable across sexes, as well as highlighted novel sex-specific genes, pathways, and genetic correlations that related to late-life memory. HIGHLIGHTS Demonstrated the heritable component of late-life memory is similar across sexes. Identified two genetic loci with a sex-interaction with baseline memory. Identified an X-chromosome locus associated with memory decline in females. Highlighted sex-specific candidate genes and pathways associated with memory. Revealed sex-specific shared genetic architecture between memory and complex traits.
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Cifuentes-Diaz C, Canali G, Garcia M, Druart M, Manett T, Savariradjane M, Guillaume C, Le Magueresse C, Goutebroze L. Differential impacts of Cntnap2 heterozygosity and Cntnap2 null homozygosity on axon and myelinated fiber development in mouse. Front Neurosci 2023; 17:1100121. [PMID: 36793543 PMCID: PMC9922869 DOI: 10.3389/fnins.2023.1100121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/09/2023] [Indexed: 01/31/2023] Open
Abstract
Over the last decade, a large variety of alterations of the Contactin Associated Protein 2 (CNTNAP2) gene, encoding Caspr2, have been identified in several neuronal disorders, including neurodevelopmental disorders and peripheral neuropathies. Some of these alterations are homozygous but most are heterozygous, and one of the current challenges is to estimate to what extent they could affect the functions of Caspr2 and contribute to the development of these pathologies. Notably, it is not known whether the disruption of a single CNTNAP2 allele could be sufficient to perturb the functions of Caspr2. To get insights into this issue, we questioned whether Cntnap2 heterozygosity and Cntnap2 null homozygosity in mice could both impact, either similarly or differentially, some specific functions of Caspr2 during development and in adulthood. We focused on yet poorly explored functions of Caspr2 in axon development and myelination, and performed a morphological study from embryonic day E17.5 to adulthood of two major brain interhemispheric myelinated tracts, the anterior commissure (AC) and the corpus callosum (CC), comparing wild-type (WT), Cntnap2 -/- and Cntnap2 +/- mice. We also looked for myelinated fiber abnormalities in the sciatic nerves of mutant mice. Our work revealed that Caspr2 controls the morphology of the CC and AC throughout development, axon diameter at early developmental stages, cortical neuron intrinsic excitability at the onset of myelination, and axon diameter and myelin thickness at later developmental stages. Changes in axon diameter, myelin thickness and node of Ranvier morphology were also detected in the sciatic nerves of the mutant mice. Importantly, most of the parameters analyzed were affected in Cntnap2 +/- mice, either specifically, more severely, or oppositely as compared to Cntnap2 -/- mice. In addition, Cntnap2 +/- mice, but not Cntnap2 -/- mice, showed motor/coordination deficits in the grid-walking test. Thus, our observations show that both Cntnap2 heterozygosity and Cntnap2 null homozygosity impact axon and central and peripheral myelinated fiber development, but in a differential manner. This is a first step indicating that CNTNAP2 alterations could lead to a multiplicity of phenotypes in humans, and raising the need to evaluate the impact of Cntnap2 heterozygosity on the other neurodevelopmental functions of Caspr2.
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Affiliation(s)
- Carmen Cifuentes-Diaz
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Giorgia Canali
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Marta Garcia
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Mélanie Druart
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Taylor Manett
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Mythili Savariradjane
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Camille Guillaume
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Corentin Le Magueresse
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France
| | - Laurence Goutebroze
- Inserm, Unité Mixte de Recherche (UMR)-S 1270, Paris, France,Faculté des Sciences et Ingénierie, Sorbonne University, Paris, France,Institut du Fer à Moulin, Paris, France,*Correspondence: Laurence Goutebroze,
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Roles and mechanisms of ankyrin-G in neuropsychiatric disorders. Exp Mol Med 2022; 54:867-877. [PMID: 35794211 PMCID: PMC9356056 DOI: 10.1038/s12276-022-00798-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/17/2022] [Accepted: 03/23/2022] [Indexed: 12/20/2022] Open
Abstract
Ankyrin proteins act as molecular scaffolds and play an essential role in regulating cellular functions. Recent evidence has implicated the ANK3 gene, encoding ankyrin-G, in bipolar disorder (BD), schizophrenia (SZ), and autism spectrum disorder (ASD). Within neurons, ankyrin-G plays an important role in localizing proteins to the axon initial segment and nodes of Ranvier or to the dendritic shaft and spines. In this review, we describe the expression patterns of ankyrin-G isoforms, which vary according to the stage of brain development, and consider their functional differences. Furthermore, we discuss how posttranslational modifications of ankyrin-G affect its protein expression, interactions, and subcellular localization. Understanding these mechanisms leads us to elucidate potential pathways of pathogenesis in neurodevelopmental and psychiatric disorders, including BD, SZ, and ASD, which are caused by rare pathogenic mutations or changes in the expression levels of ankyrin-G in the brain. Mutations affecting the production, distribution, or function of the ankyrin-G protein may contribute to a variety of different neuropsychiatric disorders. Ankyrin-G is typically observed at the synapses between neurons, and contributes to intercellular adhesion and signaling along with other important functions. Peter Penzes and colleagues at Northwestern University, Chicago, USA, review the biology of this protein and identify potential mechanisms by which ankyrin-G mutations might impair healthy brain development. Mutations in the gene encoding this protein are strongly linked with bipolar disorder, but have also been tentatively connected to autism spectrum disorders and schizophrenia. The authors highlight physiologically important interactions with a diverse array of other brain proteins, which can in turn be modulated by various chemical modifications to ankyrin-G, and conclude that drugs that influence these modifications could have potential therapeutic value.
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Takeshita LY, Davidsen PK, Herbert JM, Antczak P, Hesselink MKC, Schrauwen P, Weisnagel SJ, Robbins JM, Gerszten RE, Ghosh S, Sarzynski MA, Bouchard C, Falciani F. Genomics and transcriptomics landscapes associated to changes in insulin sensitivity in response to endurance exercise training. Sci Rep 2021; 11:23314. [PMID: 34857871 PMCID: PMC8639975 DOI: 10.1038/s41598-021-98792-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 08/25/2021] [Indexed: 01/14/2023] Open
Abstract
Despite good adherence to supervised endurance exercise training (EET), some individuals experience no or little improvement in peripheral insulin sensitivity. The genetic and molecular mechanisms underlying this phenomenon are currently not understood. By investigating genome-wide variants associated with baseline and exercise-induced changes (∆) in insulin sensitivity index (Si) in healthy volunteers, we have identified novel candidate genes whose mouse knockouts phenotypes were consistent with a causative effect on Si. An integrative analysis of functional genomic and transcriptomic profiles suggests genetic variants have an aggregate effect on baseline Si and ∆Si, focused around cholinergic signalling, including downstream calcium and chemokine signalling. The identification of calcium regulated MEF2A transcription factor as the most statistically significant candidate driving the transcriptional signature associated to ∆Si further strengthens the relevance of calcium signalling in EET mediated Si response.
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Affiliation(s)
- Louise Y. Takeshita
- grid.10025.360000 0004 1936 8470Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB UK
| | - Peter K. Davidsen
- grid.10025.360000 0004 1936 8470Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB UK
| | - John M. Herbert
- grid.10025.360000 0004 1936 8470Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB UK
| | - Philipp Antczak
- grid.10025.360000 0004 1936 8470Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB UK ,grid.411097.a0000 0000 8852 305XCenter for Molecular Medicine Cologne, University Hospital Cologne, 50931 Cologne, Germany
| | - Matthijs K. C. Hesselink
- grid.5012.60000 0001 0481 6099Department of Nutrition and Movement Sciences, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Centre, Maastricht, The Netherlands
| | - Patrick Schrauwen
- grid.5012.60000 0001 0481 6099Department of Nutrition and Movement Sciences, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Centre, Maastricht, The Netherlands
| | - S. John Weisnagel
- grid.23856.3a0000 0004 1936 8390Diabetes Research Unit, Endocrinology and Nephrology Axis, CRCHU de Québec, Université Laval, Québec City, Canada
| | - Jeremy M. Robbins
- grid.239395.70000 0000 9011 8547Division of Cardiovascular Medicine, and Cardiovascular Research Center, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA
| | - Robert E. Gerszten
- grid.239395.70000 0000 9011 8547Division of Cardiovascular Medicine, and Cardiovascular Research Center, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA
| | - Sujoy Ghosh
- grid.428397.30000 0004 0385 0924Centre for Computational Biology and Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore, Singapore
| | - Mark A. Sarzynski
- grid.254567.70000 0000 9075 106XDepartment of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC USA
| | - Claude Bouchard
- grid.250514.70000 0001 2159 6024Human Genomics Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA USA
| | - Francesco Falciani
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB, UK.
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Elsaid MF, Chalhoub N, Ben-Omran T, Kamel H, Al Mureikhi M, Ibrahim K, Elizabeth Ross M, Abdel Aleem AK. Homozygous nonsense mutation in SCHIP1/IQCJ-SCHIP1 causes a neurodevelopmental brain malformation syndrome. Clin Genet 2017; 93:387-391. [PMID: 28787085 DOI: 10.1111/cge.13122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 07/18/2017] [Accepted: 08/03/2017] [Indexed: 12/11/2022]
Abstract
We report a consanguineous Arab family with 3 affected siblings who display a disorder of global developmental delay, learning difficulties, facial dysmorphism, hearing impairments, and cataract. The clinical phenotype was associated with characteristic brain magnetic resonance imaging (MRI) features of axonal guidance defects involving anterior commissure agenesis as well as scattered areas of polymicrogyria-cobblestone complex. Whole genome sequencing revealed a novel nonsense mutation (159609921C>T) that segregated in the family consistent in an autosomal recessive pattern. This mutation located in the C-terminal region shared by the Schwanomin-Interacting Protein1 (SCHIP1) isoforms including the IQCJ-SCHIP1. The in vitro expression of SCHIP1 and IQCJ-SCHIP1 truncated mutant isoforms (NM_001197109.1; p.R209* and NM_001197114.1; p.R501*, respectively) were markedly reduced as compared to their full-length versions suggesting protein stability/folding impairment. The pathogenic nature of this mutation is supported by a previously reported mouse knockout of Schip1 isoforms, which phenocopied the human axon guidance abnormality. This is the first report of a SCHIP1/IQCJ-SCHIP1 point mutation in humans associated with a neurological-developmental phenotype.
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Affiliation(s)
- M F Elsaid
- Department of Neuropediatrics, Hamad Medical Corporation, Doha, Qatar
| | - N Chalhoub
- Neurogenetics Lab, Weill Cornell Medicine, Doha, Qatar
| | - T Ben-Omran
- Department of Clinical and Metabolic Genetics, Hamad Medical Corporation, Doha, Qatar
| | - H Kamel
- Department of Radiology, Hamad Medical Corporation, Doha, Qatar
| | - M Al Mureikhi
- Department of Clinical and Metabolic Genetics, Hamad Medical Corporation, Doha, Qatar
| | - K Ibrahim
- Department of Neuropediatrics, Hamad Medical Corporation, Doha, Qatar
| | - M Elizabeth Ross
- BMRI Center for Neurogenetics and Department of Neurology, Weill Cornell Medicine, NY, New York
| | - A K Abdel Aleem
- Neurogenetics Lab, Weill Cornell Medicine, Doha, Qatar.,BMRI Center for Neurogenetics and Department of Neurology, Weill Cornell Medicine, NY, New York
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