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1.
Clin Trials ; 21(1): 18-28, 2024 02.
Article in English | MEDLINE | ID: mdl-38321701

ABSTRACT

BACKGROUND: Neurofibromatosis type 2-related schwannomatosis is a genetic disease characterized by the development of bilateral vestibular schwannomas, ependymomas, meningiomas, and cataracts. Mild to profound hearing loss and tinnitus are common symptoms reported by individuals with neurofibromatosis type 2. While tinnitus is known to have a significant and negative impact on the quality of life of individuals from the general population, the impact on individuals with neurofibromatosis type 2 is unknown. Consensus regarding the selection of suitable patient-reported outcome measures for assessment could advance further research into tinnitus in neurofibromatosis type 2 patients. The purpose of this work is to achieve a consensus recommendation by the Response Evaluation in Neurofibromatosis and Schwannomatosis International Collaboration for patient-reported outcome measures used to evaluate quality of life in the domain of tinnitus for neurofibromatosis type 2 clinical trials. METHODS: The Response Evaluation in Neurofibromatosis and Schwannomatosis Patient-Reported Outcomes Communication Subgroup systematically evaluated patient-reported outcome measures of quality of life in the domain of tinnitus for individuals with neurofibromatosis type 2 using previously published Response Evaluation in Neurofibromatosis and Schwannomatosis rating procedures. Of the 19 identified patient-reported outcome measures, 3 measures were excluded because they were not validated as an outcome measure or could not have been used as a single outcome measure for a clinical trial. Sixteen published patient-reported outcome measures for the domain of tinnitus were scored and compared on their participant characteristics, item content, psychometric properties, and feasibility for use in clinical trials. RESULTS: The Tinnitus Functional Index was identified as the most highly rated measure for the assessment of tinnitus in populations with neurofibromatosis type 2, due to strengths in the areas of item content, psychometric properties, feasibility, and available scores. DISCUSSION: Response Evaluation in Neurofibromatosis and Schwannomatosis currently recommends the Tinnitus Functional Index for the assessment of tinnitus in neurofibromatosis type 2 clinical trials.


Subject(s)
Neurilemmoma , Neurofibromatoses , Neurofibromatosis 2 , Skin Neoplasms , Tinnitus , Humans , Neurofibromatosis 2/complications , Neurofibromatosis 2/diagnosis , Neurofibromatosis 2/genetics , Tinnitus/diagnosis , Tinnitus/etiology , Quality of Life , Neurofibromatoses/complications , Neurofibromatoses/diagnosis , Patient Reported Outcome Measures
2.
Clin Trials ; 21(1): 73-84, 2024 02.
Article in English | MEDLINE | ID: mdl-37962219

ABSTRACT

BACKGROUND/AIMS: Individuals with neurofibromatosis, including neurofibromatosis 1 (NF1), neurofibromatosis 2 (NF2)-related schwannomatosis (SWN), and other forms of SWN, often experience disease manifestations and mental health difficulties for which psychosocial interventions may help. An anonymous online survey of adults with neurofibromatosis assessed their physical, social, and emotional well-being and preferences about psychosocial interventions to inform clinical trial design. METHODS: Neurofibromatosis clinical researchers and patient representatives from the Response Evaluation in Neurofibromatosis and Schwannomatosis International Collaboration developed the survey. Eligibility criteria included age ≥ 18 years, self-reported diagnosis of NF1, NF2, or SWN, and ability to read and understand English. The online survey was distributed internationally by the Neurofibromatosis Registry and other neurofibromatosis foundations from June to August 2020. RESULTS: Surveys were completed by 630 adults (18-81 years of age; M = 45.5) with NF1 (78%), NF2 (14%), and SWN (8%) who were mostly White, not Hispanic/Latino, female, and from the United States. The majority (91%) reported that their neurofibromatosis symptoms had at least some impact on daily life. In the total sample, 51% endorsed a mental health diagnosis, and 27% without a diagnosis believed they had an undiagnosed mental health condition. Participants indicated that neurofibromatosis affected their emotional (44%), physical (38%), and social (35%) functioning to a high degree. Few reported ever having participated in a drug (6%) or psychosocial (7%) clinical trial, yet 68% reported they "probably" or "definitely" would want to participate in a psychosocial trial if it targeted a relevant concern. Top treatment targets were anxiety, healthier lifestyle, and daily stress. Top barriers to participating in psychosocial trials were distance to clinic, costs, and time commitment. Respondents preferred interventions delivered by clinicians via individual sessions or a combination of group and individual sessions, with limited in-person and mostly remote participation. There were no significant group differences by neurofibromatosis type in willingness to participate in psychosocial trials (p = 0.27). Regarding interest in intervention targets, adults with SWN were more likely to prefer psychosocial trials for pain support compared to those with NF1 (p < 0.001) and NF2 (p < 0.001). CONCLUSION: This study conducted the largest survey assessing physical symptoms, mental health needs, and preferences for psychosocial trials in adults with neurofibromatosis. Results indicate a high prevalence of disease manifestations, psychosocial difficulties, and untreated mental health problems in adults with neurofibromatosis and a high degree of willingness to participate in psychosocial clinical trials. Patient preferences should be considered when designing and implementing psychosocial interventions to develop the most feasible and meaningful studies.


Subject(s)
Neurilemmoma , Neurofibromatoses , Neurofibromatosis 1 , Neurofibromatosis 2 , Skin Neoplasms , Adult , Female , Humans , United States , Adolescent , Neurofibromatoses/therapy , Neurofibromatoses/diagnosis , Neurofibromatoses/psychology , Neurilemmoma/diagnosis , Neurilemmoma/psychology , Neurilemmoma/therapy , Skin Neoplasms/diagnosis , Skin Neoplasms/psychology , Skin Neoplasms/therapy , Neurofibromatosis 2/diagnosis , Neurofibromatosis 2/psychology , Neurofibromatosis 2/therapy , Neurofibromatosis 1/diagnosis , Neurofibromatosis 1/psychology , Neurofibromatosis 1/therapy , Surveys and Questionnaires
3.
Vaccines (Basel) ; 11(4)2023 Mar 29.
Article in English | MEDLINE | ID: mdl-37112666

ABSTRACT

Human papillomavirus (HPV) vaccines effectively prevent cervical cancer, most of which results from undetected long-term HPV infection. HPV vaccine introduction is particularly sensitive and complicated given widespread misinformation and vaccination of young girls before their sexual debut. Research has examined HPV vaccine introduction in lower- and middle-income countries (LMICs), but almost no studies attend to HPV vaccine attitudes in central Asian countries. This article describes the results of a qualitative formative research study to develop an HPV vaccine introduction communication plan in Uzbekistan. Data collection and analysis were designed using the Capability, Opportunity, and Motivation for Behaviour change (COM-B) mode for understanding health behaviours. This research was carried out with health workers, parents, grandparents, teachers, and other social influencers in urban, semi-urban, and rural sites. Information was collected using focus group discussions (FGDs) and semi-structured in-depth interviews (IDIs), and data in the form of participants' words, statements, and ideas were thematically analysed to identify COM-B barriers and drivers for each target group's HPV vaccine-related behaviour. Represented through exemplary quotations, findings were used to inform the development of the HPV vaccine introduction communication plan. Capability findings indicated that participants understood cervical cancer was a national health issue, but HPV and HPV vaccine knowledge was limited among non-health professionals, some nurses, and rural health workers. Results on an opportunity for accepting the HPV vaccine showed most participants would do so if they had access to credible information on vaccine safety and evidence. Regarding motivation, all participant groups voiced concern about the potential effects on young girls' future fertility. Echoing global research, the study results highlighted that trust in health workers and the government as health-related information sources and collaboration among schools, municipalities, and polyclinics could support potential vaccine acceptance and uptake. Resource constraints precluded including vaccine target-aged girls in research and additional field sites. Participants represented diverse social and economic backgrounds reflective of the country context, and the communication plan developed using research insights contributed to the Ministry of Health (MoH) of the Republic of Uzbekistan HPV vaccine introduction efforts that saw high first dose uptake.

4.
Am J Med Genet A ; 188(1): 71-82, 2022 01.
Article in English | MEDLINE | ID: mdl-34536052

ABSTRACT

The coronavirus pandemic increased anxiety and stress and prevented access to health care worldwide; it is unclear how COVID-19 affected adults with a multisystem genetic disorder such as neurofibromatosis (NF). An anonymous online survey was distributed through an international registry and foundations to adults with NF (June-August 2020) to assess the impact of the pandemic on mental health and NF health care. Six hundred and thirteen adults (18-81 years; M = 45.7) with NF1 (77.8%), NF2 (14.2%), and schwannomatosis (7.8%) provided complete responses. Respondents rated moderate-to-high amounts of worry about the impact of COVID-19 on their emotional (46.3%) and physical health (46.7%), and 54.8% endorsed moderate-to-high pandemic-related stress. Adults with diagnosed/suspected mental health disorders or moderate-to-severe NF symptom impact as well as females endorsed higher COVID-19 stress (ps < 0.01). Less than half who missed a doctor's appointment for their NF care (43.4%) used telehealth. Of these, 33.3% and 46.2% reported that telehealth met their needs to a moderate or high degree, respectively. Results indicated that subgroups of adults with NF experience higher COVID-19-related worries and stress and may need additional support. Furthermore, telehealth is under-utilized and could help NF providers connect with patients, although improved delivery and patient training may facilitate expanded use of these services.


Subject(s)
Anxiety/psychology , COVID-19/psychology , Mental Health/statistics & numerical data , Neurofibromatoses/psychology , Stress, Psychological/physiopathology , Telemedicine/statistics & numerical data , Adolescent , Adult , Aged , Aged, 80 and over , Anxiety/physiopathology , COVID-19/epidemiology , Europe/epidemiology , Female , Humans , Male , Middle Aged , Neurofibromatoses/physiopathology , SARS-CoV-2/pathogenicity , Surveys and Questionnaires , United States/epidemiology
5.
Neurology ; 97(7 Suppl 1): S50-S63, 2021 08 17.
Article in English | MEDLINE | ID: mdl-34230198

ABSTRACT

OBJECTIVE: To review and recommend patient-reported outcome (PRO) measures assessing multidimensional domains of quality of life (QoL) to use as clinical endpoints in medical and psychosocial trials for children and adults with neurofibromatosis (NF) type 1, NF2, and schwannomatosis. METHODS: The PRO working group of the Response Evaluation in Neurofibromatosis and Schwannomatosis (REiNS) International Collaboration used systematic methods to review, rate, and recommend existing self-report and parent-report PRO measures of generic and disease-specific QoL for NF clinical trials. Recommendations were based on 4 main criteria: patient characteristics, item content, psychometric properties, and feasibility. RESULTS: The highest-rated generic measures were (1) the Pediatric Quality of Life Inventory (PedsQL) Generic Core Scales for NF clinical trials for children or for children through adults, (2) the Functional Assessment of Cancer Therapy-General for adult medical trials, and (3) the World Health Organization Quality of Life-BREF for adult psychosocial trials. The highest-rated disease-specific measures were (1) the PedsQL NF1 Module for NF1 trials, (2) the NF2 Impact on Quality of Life Scale for NF2 trials, and (3) the Penn Acoustic Neuroma Quality of Life Scale for NF2 trials targeting vestibular schwannomas. To date, there are no disease-specific tools assessing multidimensional domains of QoL for schwannomatosis. CONCLUSIONS: The REiNS Collaboration currently recommends these generic and disease-specific PRO measures to assess multidimensional domains of QoL for NF clinical trials. Additional research is needed to further evaluate the use of these measures in both medical and psychosocial trials.


Subject(s)
Neurilemmoma/psychology , Neurofibromatoses/psychology , Quality of Life , Self Report , Skin Neoplasms/psychology , Adult , Child , Humans , Male , Patient Reported Outcome Measures , Psychometrics
6.
Neurology ; 97(7 Suppl 1): S64-S72, 2021 08 17.
Article in English | MEDLINE | ID: mdl-34230203

ABSTRACT

OBJECTIVE: To systematically evaluate published patient-reported outcome measures for the assessment of hearing function and hearing-related quality of life (QoL) and recommend measures selected by the Response Evaluation in Neurofibromatosis and Schwannomatosis International Collaboration (REiNS) as endpoints for clinical trials in neurofibromatosis type 2 (NF2). METHODS: The REiNS Patient-Reported Outcomes Working Group systematically evaluated published patient-reported outcome measures of (1) hearing function and (2) hearing-related QoL for individuals with hearing loss of various etiologies using previously published REiNS rating procedures. Ten measures of hearing functioning and 11 measures of hearing-related QoL were reviewed. Measures were numerically scored and compared primarily on their participant characteristics (including participant age range and availability of normative data), item content, psychometric properties, and feasibility for use in clinical trials. RESULTS: The Self-Assessment of Communication and the Self-Assessment of Communication-Adolescent were identified as most useful for adult and pediatric populations with NF2, respectively, for the measurement of both hearing function and hearing-related QoL. Measures were selected for their strengths in participant characteristics, item content, psychometric properties, and feasibility for use in clinical trials. CONCLUSIONS: REiNS recommends the Self-Assessment of Communication adult and adolescent forms for the assessment of patient-reported hearing function and hearing-related QoL for NF2 clinical trials. Further work is needed to demonstrate the utility of these measures in evaluating pharmacologic or behavioral interventions.


Subject(s)
Deafness/physiopathology , Hearing Loss/physiopathology , Hearing/physiology , Neurofibromatosis 2/physiopathology , Adolescent , Adult , Child , Deafness/diagnosis , Humans , Male , Neurilemmoma/physiopathology , Neurofibromatoses/physiopathology , Patient Reported Outcome Measures , Skin Neoplasms/physiopathology
7.
J Adolesc Health ; 68(2): 370-377, 2021 02.
Article in English | MEDLINE | ID: mdl-33221186

ABSTRACT

PURPOSE: Violence is the leading cause of death among adolescents and young adults in the Americas. Community-Based Participatory Action Research engaged youth and parents to develop and implement two interventions. A Violence Prevention Program (VPP) focused on risk factors for violence, and a Positive Youth Development Program (PYDP) focused on protective factors. Program effects on violence outside of and in school were assessed at 6 and 12 months. METHODS: Both interventions included an 8-week internet-based program and an in-person youth summit. Participants were prospectively randomized twice, first to the VPP and a no-VPP control group and again to the PYDP and a no-PYDP control group. Participants self-reported violence outside of and in school through self-administered baseline surveys with repeat assessments at 6 and 12 months. Analysis of covariance models examined VPP and PYDP effects on violence. RESULTS: The analysis sample was 86% Latino, 56% female, 36% aged 10-13 years, 45% aged 14-18, and 19% aged 19-23 years. Analysis of covariance models of violence outside of school demonstrated small program interaction effects at 6 months (partial eta2 = .030; p = .007) and small VPP effects at 12 months (partial eta2 = .023; p = .025). Models of violence in school demonstrated small PYDP effects at 6 months (partial eta2 = .023; p = .018). CONCLUSIONS: Community-Based Participatory Action Research engaging adolescents, young adults, and parents to address locally relevant health issues can have multiple benefits. In this study, a VPP had positive effects on violence outside of school at 12 months, and a PYDP had positive effects on violence in school at 6 months.


Subject(s)
Community-Based Participatory Research , Violence , Adolescent , Child , Female , Hispanic or Latino , Humans , Male , Parents , Schools , Violence/prevention & control , Young Adult
10.
Neurology ; 87(7 Suppl 1): S4-S12, 2016 Aug 16.
Article in English | MEDLINE | ID: mdl-27527648

ABSTRACT

OBJECTIVE: Tumors and other disease complications of neurofibromatosis (NF) can cause pain and negatively affect physical functioning. To document the clinical benefit of treatment in NF trials targeting these manifestations, patient-reported outcomes (PROs) assessing pain and physical functioning should be included as study endpoints. Currently, there is no consensus on the selection and use of such measures in the NF population. This article presents the recommendations of the PRO group of the Response Evaluation in Neurofibromatosis and Schwannomatosis (REiNS) International Collaboration for assessing the domains of pain and physical functioning for NF clinical trials. METHODS: The REiNS PRO group reviewed and rated existing PRO measures assessing pain intensity, pain interference, and physical functioning using their systematic method. Final recommendations are based primarily on 4 main criteria: patient characteristics, item content, psychometric properties, and feasibility for clinical trials. RESULTS: The REiNS PRO group chose the Numeric Rating Scale-11 (≥8 years) to assess pain intensity, the Pain Interference Index (6-24 years) and the Patient-Reported Outcome Measurement Information System (PROMIS) Pain Interference Scale (≥18 years) to evaluate pain interference, and the PROMIS Physical Functioning Scale to measure upper extremity function and mobility (≥5 years) for NF clinical trials. CONCLUSIONS: The REiNS Collaboration currently recommends these PRO measures to assess the domains of pain and physical functioning for NF clinical trials; however, further research is needed to evaluate their use in individuals with NF. A final consensus recommendation for the pain interference measure will be disseminated in a future publication based on findings from additional published research.


Subject(s)
Clinical Trials as Topic/methods , Disability Evaluation , Neurofibromatoses/physiopathology , Neurofibromatoses/therapy , Pain Measurement/methods , Patient Reported Outcome Measures , Humans , Pain/physiopathology , Self Report
11.
Neurosci Lett ; 438(2): 186-9, 2008 Jun 20.
Article in English | MEDLINE | ID: mdl-18472331

ABSTRACT

The Fischer 344 (F344) rat strain differs from the Lewis strain in the response to neuropathic pain. Recently, we found that F344 rats totally recover from mechanical allodynia induced by chronic constriction injury (CCI) of the sciatic nerve 28 days after surgery whereas Lewis rats are initiating their recovery at this time point. Thus, the use of this neuropathic pain model in these different rat strains constitutes a good strategy to identify possible target genes involved in the development of neuropathic pain. Since differences between Lewis and F344 rats in their response to pain stimuli in acute pain models have been related to differences in the endogenous opioid and noradrenergic systems, we aimed to determine the levels of expression of key genes of both systems in the spinal cord and dorsal root ganglia (DRG) of both strains 28 days after CCI surgery. Real time RT-PCR revealed minimal changes in gene expression in the spinal cord after CCI despite the strain considered, but marked changes in DRG were observed. A significant upregulation of prodynorphin gene expression occurred only in injured DRG of F344 rats, the most resistant strain to neuropathic pain. In addition, we found a significant downregulation of tyrosine hydroxylase and proenkephalin gene expression levels in both strains whereas delta-opioid receptor was found to be significantly downregulated only in injured DRG of Lewis rats although the same trend was observed in F344 rats. The data strongly suggest that dynorphins could be involved in strain differences concerning CCI resistance.


Subject(s)
Dynorphins/biosynthesis , Ganglia, Spinal/metabolism , Gene Expression Regulation/genetics , Neurons, Afferent/metabolism , Norepinephrine/biosynthesis , Peripheral Nervous System Diseases/metabolism , Animals , Chronic Disease , Denervation , Disease Models, Animal , Down-Regulation/genetics , Enkephalins/genetics , Ganglia, Spinal/cytology , Hyperalgesia/genetics , Hyperalgesia/metabolism , Hyperalgesia/physiopathology , Ligation , Male , Neurons, Afferent/cytology , Peripheral Nerve Injuries , Peripheral Nerves/metabolism , Peripheral Nerves/physiopathology , Peripheral Nervous System Diseases/genetics , Peripheral Nervous System Diseases/physiopathology , Protein Precursors/genetics , RNA, Messenger/metabolism , Rats , Rats, Inbred F344 , Rats, Inbred Lew , Receptors, Opioid, delta/genetics , Reverse Transcriptase Polymerase Chain Reaction , Species Specificity , Spinal Cord/cytology , Spinal Cord/metabolism , Tyrosine 3-Monooxygenase/genetics
12.
Neurosci Lett ; 420(3): 273-6, 2007 Jun 15.
Article in English | MEDLINE | ID: mdl-17556103

ABSTRACT

The Fischer 344 (F344) rat inbred strain differs from the inbred Lewis and the outbred Sprague-Dawley (SD) in the response to different pain stimuli, which has been partially attributed to differences in the endogenous opioid and noradrenergic systems. Since brain-derived neutrophic factor (BDNF) modulates both the endogenous opioid and noradrenergic systems, we have now studied specific changes in BDNF gene expression related to the maintenance of neuropathic pain in the three rat strains. F344 rats were found to be the only strain that completely recovered from neuropathic pain (mechanical allodynia) 28 days after chronic constriction injury (CCI) of the sciatic nerve. Real time RT-PCR studies revealed minimal changes in the expression of BDNF in the spinal cord after CCI despite the strain considered, but marked changes in dorsal root ganglia (DRG) were observed. A significant upregulation of BDNF gene expression was found only in injured DRG of F344 rats, thus correlating with higher resistance to neuropathic pain. The data suggest that BDNF could be involved in strain differences concerning CCI resistance.


Subject(s)
Brain-Derived Neurotrophic Factor/genetics , Pain/genetics , Peripheral Nervous System Diseases/genetics , Animals , Behavior, Animal/physiology , Brain-Derived Neurotrophic Factor/biosynthesis , Ganglia, Spinal/metabolism , Pain/etiology , Pain Measurement , Peripheral Nervous System Diseases/complications , Physical Stimulation , RNA, Messenger/biosynthesis , RNA, Messenger/genetics , Rats , Rats, Inbred F344 , Rats, Inbred Lew , Rats, Sprague-Dawley , Reverse Transcriptase Polymerase Chain Reaction , Species Specificity , Spinal Cord/metabolism
13.
Life Sci ; 78(8): 862-8, 2006 Jan 18.
Article in English | MEDLINE | ID: mdl-16139312

ABSTRACT

Lewis and Fischer 344 (F344) rats differ in their pharmacological responses to a variety of drugs such as opioids, which has been partially attributed to differences in the endogenous opioid tone. Since opioid and alpha2-adrenergic mechanisms closely interact in nociception and substance abuse, a comparative study of the endogenous alpha2-adrenergic system in both inbred strains is of interest. Alpha-2 adrenoceptor subtypes and tyrosine hydroxylase, the rate-limiting enzyme of the catecholamine biosynthesis, were studied by Taqman RT-PCR analysis of gene expression in four brain areas of F344 and Lewis rats: hypothalamus, hippocampus, striatum and cortex. No differences were found in the mRNA levels of alpha2A- and alpha2C-adrenoceptors in any of the areas examined, however F344 rats exhibited lower levels of alpha2B-adrenoceptor transcripts in the hippocampus and higher levels in the hypothalamus. Tyrosine hydroxylase gene expression was found to be higher in hippocampus and striatum of F344 rats compared to Lewis, and a consistent 2-fold increase of the protein levels was detected by Western blots only in the case of the hippocampus. These results together with previous studies strongly suggest that the hippocampal noradrenergic activity of Lewis and F344 rats could be involved in their different responses to pain, stress and drug addiction.


Subject(s)
Rats, Inbred F344/metabolism , Rats, Inbred Lew/metabolism , Receptors, Adrenergic, alpha-2/metabolism , Tyrosine 3-Monooxygenase/metabolism , Animals , Brain/enzymology , Gene Expression , Male , RNA, Messenger/metabolism , Rats , Rats, Inbred F344/genetics , Rats, Inbred Lew/genetics , Receptors, Adrenergic, alpha-2/genetics , Reverse Transcriptase Polymerase Chain Reaction , Species Specificity , Tyrosine 3-Monooxygenase/genetics
14.
Online J Issues Nurs ; 8(2): 3, 2003.
Article in English | MEDLINE | ID: mdl-12795629

ABSTRACT

The number and proportion of older Americans are rising rapidly and are expected to increase into the middle of the 21st century as Baby Boomers reach age 65. Medicare has been the traditional health care insurance for the elderly. Medicare was enacted in a health care climate of acute care and hospitalization. Chronic disease is the major health care cost of the 21st century with the need for long-term care growing rapidly. Medicare was never designed to pay for long-term care and custodial services. The limited scope of Medicare coverage is a problem now and will be a greater problem in the future. Long-term care is a personal responsibility and requires planning ahead. Nurses offer strategic solutions to meeting present and future needs by serving as educators, advocates, coordinators of resources, and activists working on many levels to influence care for the elderly now and in the future. This article focuses on the origins of traditional health care insurance, current and projected costs of long-term care, the current role of the government and private sector in financing long-term care, and nursing initiatives for the individual and community.


Subject(s)
Long-Term Care/trends , Patient Care Planning/trends , Aged , Community Health Nursing/education , Community Health Nursing/trends , Geriatric Nursing/trends , Humans , Long-Term Care/economics , Long-Term Care/legislation & jurisprudence , Managed Care Programs/economics , Managed Care Programs/legislation & jurisprudence , Managed Care Programs/trends , Medicare/economics , Medicare/trends , Patient Care Planning/economics , Patient Care Planning/legislation & jurisprudence
15.
Genes Chromosomes Cancer ; 35(1): 49-57, 2002 Sep.
Article in English | MEDLINE | ID: mdl-12203789

ABSTRACT

Genomic deletions of the MSH2 gene are a frequent cause of hereditary nonpolyposis colorectal cancer (HNPCC), a common hereditary predisposition to the development of tumors in several organs including the gastrointestinal and urinary tracts and endometrium. The mutation spectrum at the MSH2 gene is extremely heterogeneous because it includes nonsense and missense point mutations, small insertions and deletions leading to frameshifts, and larger genomic deletions, the latter representing approximately 25% of the total mutation burden. Here, we report the identification and molecular characterization of the first paracentric inversion of the MSH2 locus known to cause HNPCC. Southern blot analysis and inverse PCR showed that the centromeric and telomeric breakpoints of the paracentric inversion map within intron 7 and to a contig 10 Mb 3' of MSH2, respectively. Pathogenicity of the paracentric inversion was demonstrated by conversion analysis. The patient's lymphocytes were employed to generate somatic cell hybrids to analyze the expression of the inverted MSH2 allele in an Msh2-deficient rodent cellular background. The inversion was shown to abolish MSH2 expression by both northern and western analysis. This study confirms that Southern blot analysis still represents a useful and informative tool to screen for and identify complex genomic rearrangements in HNPCC. Moreover, monoallelic expression analysis represents an attractive approach to demonstrate pathogenicity of unusual mutations in autosomal dominant hereditary conditions.


Subject(s)
Chromosome Inversion , Chromosomes, Human, Pair 2/genetics , Colorectal Neoplasms, Hereditary Nonpolyposis/genetics , DNA-Binding Proteins , Gene Silencing , Proto-Oncogene Proteins/genetics , Adenosine Triphosphatases/antagonists & inhibitors , Adenosine Triphosphatases/genetics , Adult , Aged , Animals , Blotting, Southern , Colorectal Neoplasms, Hereditary Nonpolyposis/enzymology , Cytogenetic Analysis , Female , Gene Expression Profiling , Humans , Hybrid Cells , In Situ Hybridization, Fluorescence , Male , Mice , Middle Aged , MutS Homolog 2 Protein , Pedigree , Polymerase Chain Reaction , Proto-Oncogene Proteins/antagonists & inhibitors , Proto-Oncogene Proteins/deficiency
16.
Am J Hum Genet ; 70(1): 11-9, 2002 Jan.
Article in English | MEDLINE | ID: mdl-11741193

ABSTRACT

Osteoporosis is a complex disease that affects >10 million people in the United States and results in 1.5 million fractures annually. In addition, the high prevalence of osteopenia (low bone mass) in the general population places a large number of people at risk for developing the disease. In an effort to identify genetic factors influencing bone density, we characterized a family that includes individuals who possess exceptionally dense bones but are otherwise phenotypically normal. This high-bone-mass trait (HBM) was originally localized by linkage analysis to chromosome 11q12-13. We refined the interval by extending the pedigree and genotyping additional markers. A systematic search for mutations that segregated with the HBM phenotype uncovered an amino acid change, in a predicted beta-propeller module of the low-density lipoprotein receptor-related protein 5 (LRP5), that results in the HBM phenotype. During analysis of >1,000 individuals, this mutation was observed only in affected individuals from the HBM kindred. By use of in situ hybridization to rat tibia, expression of LRP5 was detected in areas of bone involved in remodeling. Our findings suggest that the HBM mutation confers a unique osteogenic activity in bone remodeling, and this understanding may facilitate the development of novel therapies for the treatment of osteoporosis.


Subject(s)
Bone Density/genetics , Bone and Bones/pathology , Genes, Dominant/genetics , LDL-Receptor Related Proteins/genetics , Mutation/genetics , Alleles , Bone and Bones/metabolism , Female , Genetic Linkage/genetics , Genetic Markers/genetics , Haplotypes/genetics , Humans , In Situ Hybridization , LDL-Receptor Related Proteins/chemistry , Male , Models, Molecular , Organ Size , Pedigree , Phenotype , Physical Chromosome Mapping , Protein Structure, Tertiary , RNA, Messenger/genetics , RNA, Messenger/metabolism , Sequence Tagged Sites
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