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Neul JL, Benke TA, Marsh ED, Suter B, Fu C, Ryther RC, Skinner SA, Lieberman DN, Feyma T, Beisang A, Heydemann P, Peters SU, Ananth A, Percy AK. Clinical Features and Disease Progression in Older Individuals with Rett Syndrome. Genes (Basel) 2024; 15:1107. [PMID: 39202466 PMCID: PMC11353339 DOI: 10.3390/genes15081107] [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: 07/12/2024] [Revised: 08/15/2024] [Accepted: 08/21/2024] [Indexed: 09/03/2024] Open
Abstract
Although long-term survival in Rett syndrome (RTT) has been observed, limited information on older people with RTT exists. We hypothesized that increased longevity in RTT would be associated with genetic variants in MECP2 associated with milder severity, and that clinical features would not be static in older individuals. To address these hypotheses, we compared the distribution of MECP2 variants and clinical severity between younger individuals with Classic RTT (under 30 years old) and older individuals (over 30 years old). Contrary to expectation, enrichment of a severe MECP2 variant (R106W) was observed in the older cohort. Overall severity was not different between the cohorts, but specific clinical features varied between the cohorts. Overall severity from first to last visit increased in the younger cohort but not in the older cohort. While some specific clinical features in the older cohort were stable from the first to the last visit, others showed improvement or worsening. These data do not support the hypothesis that mild MECP2 variants or less overall severity leads to increased longevity in RTT but demonstrate that clinical features change with increasing age in adults with RTT. Additional work is needed to understand disease progression in adults with RTT.
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Affiliation(s)
- Jeffrey L. Neul
- Department of Pediatrics, Vanderbilt Kennedy Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA; (C.F.); (S.U.P.)
| | - Timothy A. Benke
- Department of Pediatrics, Neurology and Pharmacology, University of Colorado School of Medicine, Children’s Hospital Colorado, Aurora, CO 80045, USA;
| | - Eric D. Marsh
- Department of Neurology, Children’s Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Bernhard Suter
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Cary Fu
- Department of Pediatrics, Vanderbilt Kennedy Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA; (C.F.); (S.U.P.)
| | - Robin C. Ryther
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA;
| | | | - David N. Lieberman
- Department of Neurology, Boston Children’s Hospital, Boston, MA 02115, USA;
| | - Timothy Feyma
- Gillette Children’s Specialty Healthcare, St Paul, MN 55101, USA (A.B.)
| | - Arthur Beisang
- Gillette Children’s Specialty Healthcare, St Paul, MN 55101, USA (A.B.)
| | - Peter Heydemann
- Department of Pediatrics, Rush University Medical Center, Chicago, IL 60612, USA;
| | - Sarika U. Peters
- Department of Pediatrics, Vanderbilt Kennedy Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA; (C.F.); (S.U.P.)
| | - Amitha Ananth
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (A.A.); (A.K.P.)
| | - Alan K. Percy
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (A.A.); (A.K.P.)
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Kaufmann WE, Percy AK, Neul JL, Downs J, Leonard H, Nues P, Sharma GD, Bartolotta TE, Townend GS, Curfs LMG, Mariotti O, Buda C, O'Leary HM, Oberman LM, Vogel-Farley V, Barnes KV, Missling CU. Burden of illness in Rett syndrome: initial evaluation of a disorder-specific caregiver survey. Orphanet J Rare Dis 2024; 19:296. [PMID: 39138481 PMCID: PMC11323357 DOI: 10.1186/s13023-024-03313-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 08/06/2024] [Indexed: 08/15/2024] Open
Abstract
BACKGROUND Rett syndrome (RTT) is a severe X-linked neurodevelopmental disorder associated with multiple neurologic impairments. Previous studies have shown challenges to the quality of life of individuals with RTT and their caregivers. However, instruments applied to quantify disease burden have not adequately captured the impact of these impairments on affected individuals and their families. Consequently, an international collaboration of stakeholders aimed at evaluating Burden of Illness (BOI) in RTT was organized. METHODS Based on literature reviews and qualitative interviews with parents of children and adults with RTT, a caregiver questionnaire was constructed to evaluate 22 problems (inclusive of core characteristics, functional impairments, and comorbidities) often experienced with RTT, rated mainly with a 5-level Likert scale. The questionnaire was administered anonymously online to an international sample of 756 caregivers (predominantly parents) of girls and women with RTT. Descriptive statistics were used to identify problems of high frequency and impact on affected individuals and caregivers. Chi-square tests characterized the relationship between problem severity and impact responses, while nonparametric ANOVAs of raw and z-score adjusted scores identified agreement between severity and impact on individual and caregiver. Secondary inferential tests were used to determine the roles of age, clinical type, and country of residence on BOI in RTT. RESULTS There was variability in reported frequency of problems, with the most prevalent, severe and impactful being those related to the core features of RTT (i.e., communication and fine and gross motor impairments). Chi-square analyses demonstrated interdependence between severity and impact responses, while ANOVAs showed that many problems had disproportionately greater impact than severity, either on affected individuals (e.g., hand stereotypies) or their caregivers (e.g., sleep difficulties, seizures, pain, and behavioral abnormalities). With certain exceptions (e.g., breath-holding, seizures), age, clinical type, or country of residence did not influence these BOI profiles. CONCLUSIONS Our data demonstrate that core features and related impairments are particularly impactful in RTT. However, problems with mild severity can also have disproportionate impact on affected individuals and, particularly, on their caregivers. Future analyses will examine the role of factors such as treatment outcomes, healthcare services, and healthcare provider's perspectives, in these BOI profiles.
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Affiliation(s)
- Walter E Kaufmann
- Anavex Life Sciences Corp, New York, NY, USA.
- Emory University School of Medicine, Atlanta, GA, USA.
| | - Alan K Percy
- University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA
| | - Jeffrey L Neul
- Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jenny Downs
- Telethon Kids Institute, The University of Western Australia, Nedlands, WA, Australia
| | - Helen Leonard
- Telethon Kids Institute, The University of Western Australia, Nedlands, WA, Australia
| | - Paige Nues
- International Rett Syndrome Foundation (IRSF), Cincinnati, OH, USA
| | | | | | | | | | | | - Claude Buda
- Rett Syndrome Association of Australia (RSAA), Grovedale, VIC, Australia
| | | | - Lindsay M Oberman
- National Institute of Mental Health Intramural Research Program, National Institutes of Health, Bethesda, MD, USA
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May DM, Neul J, Piña-Garza JE, Kponee-Shovein K, Satija A, Mahendran M, Downes N, Sheng K, Lema N, Boca A, Lefebvre P, Abler V, Youakim JM, Cheng WY. Gastrointestinal manifestations in pediatric and adult patients with Rett syndrome: an analysis of US claims and physician survey data. J Comp Eff Res 2024; 13:e230054. [PMID: 37971297 PMCID: PMC10842289 DOI: 10.57264/cer-2023-0054] [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: 04/13/2023] [Accepted: 10/31/2023] [Indexed: 11/19/2023] Open
Abstract
Aim: Patients with Rett syndrome (RTT) experience gastrointestinal (GI) manifestations. This study aimed to describe the prevalence of GI manifestations and the associated medical costs in patients with RTT in the USA. Patients & Methods: The study combined an insurance claims database analysis with a survey of 100 physicians experienced in RTT management. Results: GI manifestations affected 43.0% of 5940 patients, with increased prevalence in pediatric patients (45.6%) relative to adult patients (40.2%). Annualized mean medical cost of managing GI manifestations was $4473. Only 5.9-8.2% of neurologists and pediatricians ranked GI symptom management among the five most important treatment goals. Conclusion: Patients with RTT experience a high burden of GI manifestations, which translate to considerable medical costs. Importantly, the prevalence of GI manifestations was likely underestimated in this study, as only those symptoms which resulted in a healthcare encounter were captured.
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Affiliation(s)
- Damian M May
- Acadia Pharmaceuticals Inc., San Diego, CA 92130, USA
| | - Jeffrey Neul
- Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | | | | | | | | | | | - Neema Lema
- Analysis Group, Inc., Menlo Park, CA 94025, USA
| | - Andra Boca
- Analysis Group, Inc., Boston, MA 02199, USA
| | | | - Victor Abler
- Acadia Pharmaceuticals Inc., San Diego, CA 92130, USA
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Epigenetic genes and epilepsy - emerging mechanisms and clinical applications. Nat Rev Neurol 2022; 18:530-543. [PMID: 35859062 DOI: 10.1038/s41582-022-00693-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/16/2022] [Indexed: 12/21/2022]
Abstract
An increasing number of epilepsies are being attributed to variants in genes with epigenetic functions. The products of these genes include factors that regulate the structure and function of chromatin and the placing, reading and removal of epigenetic marks, as well as other epigenetic processes. In this Review, we provide an overview of the various epigenetic processes, structuring our discussion around five function-based categories: DNA methylation, histone modifications, histone-DNA crosstalk, non-coding RNAs and chromatin remodelling. We provide background information on each category, describing the general mechanism by which each process leads to altered gene expression. We also highlight key clinical and mechanistic aspects, providing examples of genes that strongly associate with epilepsy within each class. We consider the practical applications of these findings, including tissue-based and biofluid-based diagnostics and precision medicine-based treatments. We conclude that variants in epigenetic genes are increasingly found to be causally involved in the epilepsies, with implications for disease mechanisms, treatments and diagnostics.
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Potential of Multiscale Astrocyte Imaging for Revealing Mechanisms Underlying Neurodevelopmental Disorders. Int J Mol Sci 2021; 22:ijms221910312. [PMID: 34638653 PMCID: PMC8508625 DOI: 10.3390/ijms221910312] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 01/18/2023] Open
Abstract
Astrocytes provide trophic and metabolic support to neurons and modulate circuit formation during development. In addition, astrocytes help maintain neuronal homeostasis through neurovascular coupling, blood-brain barrier maintenance, clearance of metabolites and nonfunctional proteins via the glymphatic system, extracellular potassium buffering, and regulation of synaptic activity. Thus, astrocyte dysfunction may contribute to a myriad of neurological disorders. Indeed, astrocyte dysfunction during development has been implicated in Rett disease, Alexander's disease, epilepsy, and autism, among other disorders. Numerous disease model mice have been established to investigate these diseases, but important preclinical findings on etiology and pathophysiology have not translated into clinical interventions. A multidisciplinary approach is required to elucidate the mechanism of these diseases because astrocyte dysfunction can result in altered neuronal connectivity, morphology, and activity. Recent progress in neuroimaging techniques has enabled noninvasive investigations of brain structure and function at multiple spatiotemporal scales, and these technologies are expected to facilitate the translation of preclinical findings to clinical studies and ultimately to clinical trials. Here, we review recent progress on astrocyte contributions to neurodevelopmental and neuropsychiatric disorders revealed using novel imaging techniques, from microscopy scale to mesoscopic scale.
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