Orphan or Rare Diseases

Genomic testing and molecular diagnosis among infants with congenital heart disease in the neonatal intensive care unit

Tue, 2024-03-19 06:00

J Perinatol. 2024 Mar 18. doi: 10.1038/s41372-024-01935-1. Online ahead of print.

ABSTRACT

OBJECTIVE: To evaluate patterns of genetic testing among infants with CHD at a tertiary care center.

STUDY DESIGN: We conducted a retrospective observational cohort study of infants in the NICU with suspicion of a genetic disorder. 1075 of 7112 infants admitted to BCH had genetic evaluation including 329 with CHD and 746 without CHD. 284 of 525 infants with CHD admitted to CMHH had genetic evaluation. Patterns of testing and diagnoses were compared.

RESULTS: The rate of diagnosis after testing was similar for infants with or without CHD (38% [121/318] vs. 36% [246/676], p = 0.14). In a multiple logistic regression, atrioventricular septal defects were most high associated with genetic diagnosis (odds ratio 29.99, 95% confidence interval 2.69-334.12, p < 0.001).

CONCLUSIONS: Infants with suspicion of a genetic disorder with CHD had similar rates of molecular diagnosis as those without CHD. These results support a role for genetic testing among NICU infants with CHD.

PMID:38499751 | DOI:10.1038/s41372-024-01935-1

Categories: Literature Watch

Male ductal carcinoma in situ: diagnosis and management of a rare disease in men

Mon, 2024-03-18 06:00

BMJ Case Rep. 2024 Mar 18;17(3):e256608. doi: 10.1136/bcr-2023-256608.

ABSTRACT

Ductal carcinoma in situ is very rare in male patients, accounting for approximately 5%-7% of all male breast cancers. We present a case of a man in his early 70s who presented with bloody nipple discharge and gynaecomastia and was subsequently diagnosed with ductal carcinoma in situ (DCIS). We discuss his management with surgical resection and the consideration of adjuvant treatment. We also review the existing literature on the presentation, diagnosis and management of DCIS in men.

PMID:38499353 | DOI:10.1136/bcr-2023-256608

Categories: Literature Watch

Distribution of hand function by age in individuals with Rett syndrome

Mon, 2024-03-18 06:00

Ann Child Neurol Soc. 2023 Sep;1(3):228-238. doi: 10.1002/cns3.20038. Epub 2023 Sep 12.

ABSTRACT

OBJECTIVE: To determine the longitudinal distribution of hand function skills in individuals with classic Rett Syndrome (RTT), an X-linked dominant neurodevelopmental disorder, and correlate with MECP2 variants.

METHOD: We conducted a longitudinal study of 946 girls and young women with typical RTT seen between 2006 and 2021 in the US Natural History Study (NHS) featuring a structured clinical evaluation to assess the level of hand function skills. The specific focus in this study was to assess longitudinal variation of hand skills from age 2 through age 18 years in relation to specific MECP2 variant groups.

RESULTS: Following the initial regression period, hand function continues to decline across the age spectrum in individuals with RTT. Specific differences are noted with steeper declines in hand function among those with milder variants (Group A: R133C, R294X, R306C, and C-terminal truncations) compared to groups composed of individuals with more severe variants.

CONCLUSIONS: These temporal variations in hand use represent specific considerations which could influence the design of clinical trials that test therapies aiming to ameliorate specific functional limitations in individuals with RTT. Furthermore, the distinct impact of specific MECP2 variants on clinical severity, especially related to hand use, should be considered in such interventional trials.

PMID:38496825 | PMC:PMC10939125 | DOI:10.1002/cns3.20038

Categories: Literature Watch

Ensuring Stakeholder Feedback in the Design and Conduct of Clinical Trials for Rare Diseases: ISCTM Position Paper of the Orphan Disease Working Group

Mon, 2024-03-18 06:00

Innov Clin Neurosci. 2024 Mar 1;21(1-3):52-60. eCollection 2024 Jan-Mar.

ABSTRACT

The 1983 Orphan Drug Act in the United States (US) changed the landscape for development of therapeutics for rare or orphan diseases, which collectively affect approximately 300 million people worldwide, half of whom are children. The act has undoubtedly accelerated drug development for orphan diseases, with over 6,400 orphan drug applications submitted to the US Food and Drug Administration (FDA) from 1983 to 2023, including 350 drugs approved for over 420 indications. Drug development in this population is a global and collaborative endeavor. This position paper of the International Society for Central Nervous System Clinical Trials and Methodology (ISCTM) describes some potential best practices for the involvement of key stakeholder feedback in the drug development process. Stakeholders include advocacy groups, patients and caregivers with lived experience, public and private research institutions (including academia and pharmaceutical companies), treating clinicians, and funders (including the government and independent foundations). The authors articulate the challenges of drug development in orphan diseases and propose methods to address them. Challenges range from the poor understanding of disease history to development of endpoints, targets, and clinical trials designs, to finding solutions to competing research priorities by involved parties.

PMID:38495603 | PMC:PMC10941866

Categories: Literature Watch

Effects of rare kidney diseases on kidney failure: a longitudinal analysis of the UK National Registry of Rare Kidney Diseases (RaDaR) cohort

Sat, 2024-03-16 06:00

Lancet. 2024 Mar 30;403(10433):1279-1289. doi: 10.1016/S0140-6736(23)02843-X. Epub 2024 Mar 13.

ABSTRACT

BACKGROUND: Individuals with rare kidney diseases account for 5-10% of people with chronic kidney disease, but constitute more than 25% of patients receiving kidney replacement therapy. The National Registry of Rare Kidney Diseases (RaDaR) gathers longitudinal data from patients with these conditions, which we used to study disease progression and outcomes of death and kidney failure.

METHODS: People aged 0-96 years living with 28 types of rare kidney diseases were recruited from 108 UK renal care facilities. The primary outcomes were cumulative incidence of mortality and kidney failure in individuals with rare kidney diseases, which were calculated and compared with that of unselected patients with chronic kidney disease. Cumulative incidence and Kaplan-Meier survival estimates were calculated for the following outcomes: median age at kidney failure; median age at death; time from start of dialysis to death; and time from diagnosis to estimated glomerular filtration rate (eGFR) thresholds, allowing calculation of time from last eGFR of 75 mL/min per 1·73 m2 or more to first eGFR of less than 30 mL/min per 1·73 m2 (the therapeutic trial window).

FINDINGS: Between Jan 18, 2010, and July 25, 2022, 27 285 participants were recruited to RaDaR. Median follow-up time from diagnosis was 9·6 years (IQR 5·9-16·7). RaDaR participants had significantly higher 5-year cumulative incidence of kidney failure than 2·81 million UK patients with all-cause chronic kidney disease (28% vs 1%; p<0·0001), but better survival rates (standardised mortality ratio 0·42 [95% CI 0·32-0·52]; p<0·0001). Median age at kidney failure, median age at death, time from start of dialysis to death, time from diagnosis to eGFR thresholds, and therapeutic trial window all varied substantially between rare diseases.

INTERPRETATION: Patients with rare kidney diseases differ from the general population of individuals with chronic kidney disease: they have higher 5-year rates of kidney failure but higher survival than other patients with chronic kidney disease stages 3-5, and so are over-represented in the cohort of patients requiring kidney replacement therapy. Addressing unmet therapeutic need for patients with rare kidney diseases could have a large beneficial effect on long-term kidney replacement therapy demand.

FUNDING: RaDaR is funded by the Medical Research Council, Kidney Research UK, Kidney Care UK, and the Polycystic Kidney Disease Charity.

PMID:38492578 | DOI:10.1016/S0140-6736(23)02843-X

Categories: Literature Watch

The impact of rare kidney diseases on kidney failure

Sat, 2024-03-16 06:00

Lancet. 2024 Mar 30;403(10433):1211-1213. doi: 10.1016/S0140-6736(24)00198-3. Epub 2024 Mar 13.

NO ABSTRACT

PMID:38492577 | DOI:10.1016/S0140-6736(24)00198-3

Categories: Literature Watch

Using team-based precision medicine to advance understanding of rare genetic brain disorders

Sat, 2024-03-16 06:00

J Neurodev Disord. 2024 Mar 15;16(1):10. doi: 10.1186/s11689-024-09518-z.

ABSTRACT

We describe a multidisciplinary teamwork approach known as "Operation IDD Gene Team" developed by the Rose F. Kennedy Intellectual and Developmental Disabilities Research Center (RFK IDDRC) at the Albert Einstein College of Medicine. This initiative brings families affected by rare genetic diseases that cause intellectual and developmental disability together with physicians, basic scientists, and their trainees. At team meetings, family members share their child's medical and personal history, physicians describe the broader clinical consequences of the condition, and scientists provide accessible tutorials focused on the fundamental biology of relevant genes. When appropriate, possible treatment approaches are also discussed. The outcomes of team meetings have been overwhelmingly positive, with families not only expressing deep gratitude, but also becoming empowered to establish foundations dedicated to their child's specific condition. Physicians, and in particular the scientists and their trainees, have gained a deeper understanding of challenges faced by affected families, broadening their perspective on how their research can extend beyond the laboratory. Remarkably, research by the scientists following the Gene Team meetings have often included focus on the actual gene variants exhibited by the participating children. As these investigations progress and newly created foundations expand their efforts, national as well as international collaborations are forged. These developments emphasize the importance of rare diseases as windows into previously unexplored molecular and cellular processes, which can offer fresh insights into both normal function as well as more common diseases. Elucidating the mechanisms of and treatments for rare and ultra-rare diseases thus has benefits for all involved-families, physicians, and scientists and their trainees, as well as the broader medical community. While the RFK IDDRC's Operation IDD Gene Team program has focused on intellectual disabilities affecting children, we believe it has the potential to be applied to rare genetic diseases impacting individuals of any age and encompassing a wide variety of developmental disorders affecting multiple organ systems.

PMID:38491427 | PMC:PMC10941544 | DOI:10.1186/s11689-024-09518-z

Categories: Literature Watch

Sensory neuropathy as a manifestation of multiple acyl-coenzyme A dehydrogenase deficiency

Fri, 2024-03-15 06:00

BMJ Case Rep. 2024 Mar 15;17(3):e259192. doi: 10.1136/bcr-2023-259192.

ABSTRACT

Multiple acyl-coenzyme A dehydrogenase deficiency (MADD) is a rare metabolic disorder which typically manifests with muscle weakness. However, despite late-onset MADD being treatable, it is often misdiagnosed, due in part to the heterogeneity of presentations. We report a case of late-onset MADD manifesting first as a sensory neuropathy before progressing to myopathic symptoms and acute metabolic decompensation. Early diagnostic workup with acylcarnitine profiling and organic acid analysis was critical in patient outcome; metabolic decompensation and myopathic symptoms were completely reversed with riboflavin supplementation and dietary modification, although sensory neuropathy persisted. Clinical consideration of MADD as part of the differential diagnosis of neuropathy with myopathy is crucial for a timely diagnosis and treatment of MADD.

PMID:38490702 | DOI:10.1136/bcr-2023-259192

Categories: Literature Watch

Machine learning-based algorithms applied to drug prescriptions and other healthcare services in the Sicilian claims database to identify acromegaly as a model for the earlier diagnosis of rare diseases

Fri, 2024-03-15 06:00

Sci Rep. 2024 Mar 14;14(1):6186. doi: 10.1038/s41598-024-56240-w.

ABSTRACT

Acromegaly is a rare disease characterized by a diagnostic delay ranging from 5 to 10 years from the symptoms' onset. The aim of this study was to develop and internally validate machine-learning algorithms to identify a combination of variables for the early diagnosis of acromegaly. This retrospective population-based study was conducted between 2011 and 2018 using data from the claims databases of Sicily Region, in Southern Italy. To identify combinations of potential predictors of acromegaly diagnosis, conditional and unconditional penalized multivariable logistic regression models and three machine learning algorithms (i.e., the Recursive Partitioning and Regression Tree, the Random Forest and the Support Vector Machine) were used, and their performance was evaluated. The random forest (RF) algorithm achieved the highest Area under the ROC Curve value of 0.83 (95% CI 0.79-0.87). The sensitivity in the test set, computed at the optimal threshold of predicted probabilities, ranged from 28% for the unconditional logistic regression model to 69% for the RF. Overall, the only diagnosis predictor selected by all five models and algorithms was the number of immunosuppressants-related pharmacy claims. The other predictors selected by at least two models were eventually combined in an unconditional logistic regression to develop a meta-score that achieved an acceptable discrimination accuracy (AUC = 0.71, 95% CI 0.66-0.75). Findings of this study showed that data-driven machine learning algorithms may play a role in supporting the early diagnosis of rare diseases such as acromegaly.

PMID:38485706 | PMC:PMC10940660 | DOI:10.1038/s41598-024-56240-w

Categories: Literature Watch

Resolution of Severe Portopulmonary Hypertension With Inhaled Treprostinil and Liver Transplantation

Thu, 2024-03-14 06:00

Tex Heart Inst J. 2024 Mar 14;51(1):e238209. doi: 10.14503/THIJ-23-8209.

ABSTRACT

Portopulmonary hypertension is a rare condition with a poor prognosis. Prompt management is essential for liver transplantation eligibility, a potentially curative option. This report presents a case of severe portopulmonary hypertension that resolved with a conservative therapeutic regimen of tadalafil, macitentan, and inhaled treprostinil, which ultimately enabled successful liver transplantation. There was no recurrence of pulmonary hypertension after transplantation, and the patient was weaned off most pulmonary arterial hypertension therapies. This case report is the first to provide evidence that inhaled treprostinil is a safe and effective alternative to continuous intravenous prostacyclins in portopulmonary hypertension.

PMID:38483473 | DOI:10.14503/THIJ-23-8209

Categories: Literature Watch

Is orofacial granulomatosis a distinct clinical disorder?

Wed, 2024-03-13 06:00

Dermatol Online J. 2023 Dec 15;29(6). doi: 10.5070/D329663003.

ABSTRACT

Orofacial granulomatosis is a rare disorder that is heterogeneously defined in the published literature. Herein, we describe a patient with orofacial granulomatosis with clinical and histologic evidence, discuss differential diagnoses, and offer clinical pearls for diagnosing and assessing this disorder. Our case provides support that orofacial granulomatosis is a distinct disorder as opposed to a sequela of other systemic granulomatous diseases. This information will aid dermatologists in decision making and diagnosing the disorder.

PMID:38478674 | DOI:10.5070/D329663003

Categories: Literature Watch

Clinical and Imaging Profile of Patients with Cerebrotendinous Xanthomatosis - a Video Case Series from India

Wed, 2024-03-13 06:00

Tremor Other Hyperkinet Mov (N Y). 2024 Mar 6;14:10. doi: 10.5334/tohm.851. eCollection 2024.

ABSTRACT

BACKGROUND: Cerebrotendinous xanthomatosis (CTX) is a rare autosomal recessive disorder caused by bi-allelic pathogenic variants in CYP27A1 gene that results in the deposition of cholestanol in the eyes, tendons, soft tissues and nervous system leading to cataracts, xanthomas, and various neuropsychiatric manifestations. The aim of our study is to describe the clinical, radiological and genetic profile of patients with CTX.

METHODS: This is a retrospective chart review of patients with CTX diagnosed based on classical clinical and radiological findings. The available clinical details, and investigations, including imaging, electrophysiological, pathological and genetic data, were documented.

RESULTS: Five patients (4 males) were recruited in the study. The median age at presentation was 32 years (range: 21-66 years). Walking difficulty was the most common symptom at presentation. All patients had cataracts, tendon xanthomas, eye movement abnormalities, dysarthria, pyramidal signs, ataxia and gait abnormality. Dystonia was noted in three patients. Palatal tremor and parkinsonism were noted in one patient each. In MRI brain, dentate, and corticospinal tract involvement were the most frequent imaging findings. Bilateral hypertrophic olivary degeneration was noted in one patient and hot cross bun sign in two. Three patients underwent genetic testing and all had pathogenic variants confirming the diagnosis.

DISCUSSION: CTX is a rare treatable disorder. Apart from the usual neurological presentation with spastic-ataxia, it can present at a later age with parkinsonism. Typical patterns of imaging findings are helpful in early diagnosis which aids in the treatment to prevent the neurological sequelae of the disease.

PMID:38476584 | PMC:PMC10929277 | DOI:10.5334/tohm.851

Categories: Literature Watch

A systematic review of real-world evidence (RWE) supportive of new drug and biologic license application approvals in rare diseases

Wed, 2024-03-13 06:00

Orphanet J Rare Dis. 2024 Mar 12;19(1):117. doi: 10.1186/s13023-024-03111-2.

ABSTRACT

BACKGROUND: Real-world evidence (RWE) generated using real-world data (RWD) presents the potential to contextualize and/or supplement traditional clinical trials for regulatory approval of rare diseases (RDs). This systematic review evaluated the use of RWD for non-oncologic RD therapies with orphan drug designation (ODD) to support efficacy outcomes in regulatory application packages to the US Food and Drug Administration (FDA). New drug applications (NDAs) and biologic license applications (BLAs) submitted between January 2017 and October 2022 were obtained from publicly available FDA drug approval websites. NDAs and BLAs of non-oncologic RD therapies were screened, and manually reviewed using RWE-related keywords. Quantitative summary of number/proportion of study types was provided, whereas qualitative synthesis focused on key categories of output assessing the use of RWD in overall drug approval process, including agency's feedback on its strengths and key challenges.

RESULTS: A total of 868 NDAs and BLAs were identified, of which 243 were screened for non-oncologic RDs with ODD, and 151 were subsequently reviewed for the RWD used to support efficacy outcomes. Twenty (12 NDAs, 8 BLAs) applications met the review inclusion criteria. Most (19; 95%) applications used only retrospective RWD, while one (5%) collected RWD both retrospectively and prospectively. RWD studies included natural history including registry-based/retrospective historical controls (14; 70%), retrospective medical chart-reviews (4; 20%), and external RWD controls from other studies (2; 10%). The FDA generally accepted RWD studies demonstrating a large effect size despite the noted concerns and criticisms. However, the agency expressed concerns about overall quality and comparability of RWD with trial data for some applications, including RWD study designs with respect to differences in patients' baseline characteristics, missing information, and potential bias and measurement errors.

CONCLUSIONS: This systematic review highlights potential benefits of appropriately conducted RWE studies in RD, which can strengthen the clinical evidence for efficacy comparison and contextualization to support product approval efforts, particularly when a large magnitude of effect is observed for the new intervention. Nonetheless, quality and completeness of RWD and its comparability with trial data remain areas of concern that can serve as valuable learnings for advancing future science and regulatory approvals.

PMID:38475874 | PMC:PMC10936002 | DOI:10.1186/s13023-024-03111-2

Categories: Literature Watch

Nutrient vessel dysfunction can contribute to mucoid degeneration of the posterior cruciate ligament coexisting with lipoma arborescens: A case study

Wed, 2024-03-13 06:00

Int J Surg Case Rep. 2024 Mar 5;117:109462. doi: 10.1016/j.ijscr.2024.109462. Online ahead of print.

ABSTRACT

INTRODUCTION: With the rapid improvement of magnetic resonance imaging (MRI), mucoid degeneration (MD) of the anterior cruciate ligament (MD-ACL) has become an established disease entity and mechanical factors, such as increased posterior tibial tilt and intercondylar notch impingement, have been proposed. However, symptomatic MD of the posterior cruciate ligament (MD-PCL) remains an orphan disease without any established etiology.

PRESENTATION OF CASE: A man in his 60s exhibited restricted range of motion with knee pain. MRI revealed PCL enlargement with high-signal intensity and tram-track appearance on T2-weighted sagittal images and lipoma arborescens (LA) in the suprapatellar pouch. On gadolinium-enhanced MRI, the distal PCL was not contrasted. Arthroscopy revealed an almost normal expanded appearance with partial loss of the envelope synovium. Debulking operation was performed. Pathological findings revealed intravascular thrombus formation in early lesions of MD, and intraligamentous vascular degeneration and severity of MD were proportional.

DISCUSSION: ACL is susceptible to mechanical external forces from surrounding tissues because of its anatomical features that induce protease expression, resulting in MD-ACL with denatured large aggregating proteoglycans deposition. Conversely, occlusion of nutrient vessels within the ligament was observed in this case of MD-PCL. Coexisting LA likely provoked an inflammatory response with hypercoagulability, resulting in thromboembolism of the envelope synovial nutrient vessel.

CONCLUSION: MD-CL is a disease entity comprising multiple pathologies. Although symptomatic MD-ACL is mainly caused by mechanical factors with a relatively high morbidity rate, nutrient vessel dysfunction can contribute to symptomatic MD-PCL with coexisting LA in middle-aged adults with an extremely low morbidity rate.

PMID:38479129 | DOI:10.1016/j.ijscr.2024.109462

Categories: Literature Watch

Klippel-Trenaunay syndrome or not? An exploration of atypical presentations

Tue, 2024-03-12 06:00

BMJ Case Rep. 2024 Mar 12;17(3):e259763. doi: 10.1136/bcr-2024-259763.

ABSTRACT

Klippel-Trenaunay syndrome (KTS) is a rare, congenital disorder typically emerging in early infancy or childhood. The classic presentation of KTS is distinguished by a triad of clinical features: a port-wine stain, early-onset varicosities and limb overgrowth. However, a notable variant of KTS has been documented, characterised by limb shortening rather than lengthening, occasionally referred to as 'inverse KTS'. This report details two cases that display this unusual presentation-both patients had classical features of port-wine stain and varicose veins but both experienced shortening of the affected limb. Whether these cases represent a variant of KTS or a new clinical syndrome altogether is uncertain. They however offer valuable insights into the nuances and breadth of clinical manifestations associated with this syndrome.

PMID:38471707 | PMC:PMC10936486 | DOI:10.1136/bcr-2024-259763

Categories: Literature Watch

Repurposing of rituximab biosimilars to treat B cell mediated autoimmune diseases

Tue, 2024-03-12 06:00

FASEB J. 2024 Mar 15;38(5):e23536. doi: 10.1096/fj.202302259RR.

ABSTRACT

Rituximab, the first monoclonal antibody approved for the treatment of lymphoma, eventually became one of the most popular and versatile drugs ever in terms of clinical application and revenue. Since its patent expiration, and consequently, the loss of exclusivity of the original biologic, its repurposing as an off-label drug has increased dramatically, propelled by the development and commercialization of its many biosimilars. Currently, rituximab is prescribed worldwide to treat a vast range of autoimmune diseases mediated by B cells. Here, we present a comprehensive overview of rituximab repurposing in 115 autoimmune diseases across 17 medical specialties, sourced from over 1530 publications. Our work highlights the extent of its off-label use and clinical benefits, underlining the success of rituximab repurposing for both common and orphan immune-related diseases. We discuss the scientific mechanism associated with its clinical efficacy and provide additional indications for which rituximab could be investigated. Our study presents rituximab as a flagship example of drug repurposing owing to its central role in targeting cluster of differentiate 20 positive (CD20) B cells in 115 autoimmune diseases.

PMID:38470360 | DOI:10.1096/fj.202302259RR

Categories: Literature Watch

Methodological advances in patient-centered rare disease research: the UTHealth Houston Turner Syndrome Society of the United States research registry

Tue, 2024-03-12 06:00

Orphanet J Rare Dis. 2024 Mar 11;19(1):112. doi: 10.1186/s13023-024-03120-1.

ABSTRACT

BACKGROUND: Many different clinical specialists provide care to patients with Turner syndrome (TS), who have highly variable clinical manifestations. Therefore, a national TS registry is essential to inform a cohesive approach to healthcare and research. In 2015, the Turner Syndrome Society of the United States (TSSUS) created the Turner Syndrome Research Registry (TSRR) to engage directly with community participants who voluntarily provide longitudinal data about their experiences with TS. TSRR projects are collaborative partnerships between people with TS, TSSUS, and researchers.

RESULTS: To ensure that registry workflows conform to the data privacy choices of participants, TSSUS collaborated with UTHealth Houston in 2021 to create a new version of the TSRR that completely separates participant health data (stored at UTHealth) and personal identifiers (maintained at TSSUS). We developed an innovative Visual Basic (VB) script that, when embedded into Microsoft Outlook, redirects REDCap surveys through TSSUS to participants by matching registry IDs to participant email addresses. Additionally, the utilization of REDCap allows for portability of data as it is an open source platform.

CONCLUSION: In this report, we will highlight three recent changes that more closely align the TSRR with this mission: a unique and equal collaborative partnership between UTHealth and TSSUS, an open-source platform, REDCap, that ensures data portability and compatibility across institutions, and an innovative survey routing system that retains participant confidentiality without sacrificing REDCap survey distribution capabilities to connect researchers with thousands of participants.

PMID:38468317 | PMC:PMC10929126 | DOI:10.1186/s13023-024-03120-1

Categories: Literature Watch

Zebrafish and cellular models of <em>SELENON</em>-Related Myopathy exhibit novel embryonic and metabolic phenotypes

Mon, 2024-03-11 06:00

bioRxiv [Preprint]. 2024 Feb 26:2024.02.26.581979. doi: 10.1101/2024.02.26.581979.

ABSTRACT

SELENON-Related Myopathy (SELENON-RM) is a rare congenital myopathy caused by mutations of the SELENON gene characterized by axial muscle weakness and progressive respiratory insufficiency. Muscle histopathology commonly includes multiminicores or a dystrophic pattern but is often non-specific. The SELENON gene encodes selenoprotein N (SelN), a selenocysteine-containing redox enzyme located in the endo/sarcoplasmic reticulum membrane where it colocalizes with mitochondria-associated membranes. However, the molecular mechanism(s) by which SelN deficiency causes SELENON-RM are undetermined. A hurdle is the lack of cellular and animal models that show assayable phenotypes. Here we report deep-phenotyping of SelN-deficient zebrafish and muscle cells. SelN-deficient zebrafish exhibit changes in embryonic muscle function and swimming activity in larvae. Analysis of single cell RNAseq data in a zebrafish embryo-atlas revealed coexpression between selenon and genes involved in glutathione redox pathway. SelN-deficient zebrafish and mouse myoblasts exhibit changes in glutathione and redox homeostasis, suggesting a direct relationship with SelN function. We report changes in metabolic function abnormalities in SelN-null myotubes when compared to WT. These results suggest that SelN has functional roles during zebrafish early development and myoblast metabolism.

PMID:38464009 | PMC:PMC10925121 | DOI:10.1101/2024.02.26.581979

Categories: Literature Watch

Analysis of caregiver perspectives on patients with mucopolysaccharidosis II treated with pabinafusp alfa: results of qualitative interviews in Japan

Fri, 2024-03-08 06:00

Orphanet J Rare Dis. 2024 Mar 7;19(1):104. doi: 10.1186/s13023-024-03112-1.

ABSTRACT

BACKGROUND: Mucopolysaccharidosis type II (MPS II), or Hunter syndrome, is a rare X-linked metabolic disorder predominantly affecting males. Pabinafusp alfa, an iduronate-2-sulfatase enzyme designed to cross the blood-brain barrier, was approved in Japan in 2021 as the first enzyme replacement therapy targeting both the neuropathic and somatic signs and symptoms of MPS II. This study reports caregivers' experiences of MPS II patients receiving pabinafusp alfa through qualitative interviews.

METHODS: Semi-structured, qualitative interviews were conducted with caregivers at seven clinical sites in Japan using a semi-structured moderation guide (Voice of the Caregiver guide). Thematic analysis was applied to the interview transcripts to identify symptoms and health-related quality of life impacts at baseline, changes during treatment, and overall treatment experience.

RESULTS: Seven caregivers from 16 trial sites participated, representing seven children aged 8-18 years who had received pabinafusp alfa for 3.3-3.5 years at the time of the interviews. Data suggest a general trend toward improvement in multiple aspects, although not all caregivers observed discernible changes. Reported cognitive improvements included language skills, concentration, self-control, eye contact, mental clarity, concept understanding, following instructions, and expressing personal needs. Further changes were reported that included musculoskeletal improvements and such somatic changes as motor function, mobility, organ involvement, joint mobility, sleep patterns, and fatigue. Four caregivers reported improvements in family quality of life, five expressed treatment satisfaction, and all seven indicated a strong willingness to continue treatment of their children with pabinafusp alfa.

CONCLUSION: Caregivers' perspectives in this study demonstrate treatment satisfaction and improvement in various aspects of quality of life following therapy with pabinafusp alfa. These findings enhance understanding of pabinafusp alfa's potential benefits in treating MPS II and contribute to defining MPS II-specific outcome measures for future clinical trials.

PMID:38454486 | PMC:PMC10921713 | DOI:10.1186/s13023-024-03112-1

Categories: Literature Watch

Catamenial pneumothorax with persistent air leak

Thu, 2024-03-07 06:00

An Sist Sanit Navar. 2024 Mar 7;47(1):e1069. doi: 10.23938/ASSN.1069.

ABSTRACT

Catamenial pneumothorax is a spontaneous recurrent pneumothorax that occurs in women of reproductive age and in temporal relationship with the menses. It usually occurs within 24 hours before or 72 hours after the start of the menstrual cycle; however, multiple variations have been described in terms of the temporal relationship. To date, it is considered a rare condition; this may be justified by the limited available knowledge on this disease leading to misdiagnosis. Often, making a diagnosis of catamenial pneumothorax is complicated; it mainly depends on the medical history; also, it may be a surgical or histopathological diagnosis. Management strategies for catamenial pneumothorax may include combinations of hormonal therapy, pleurodesis, lung parenchyma resection, and diaphragm resection/repair. The aim of reporting this atypical case of catamenial pneumothorax is to highlight the relevance of having the adequate knowledge on this entity so it does not go unnoticed despite its apparent low incidence.

PMID:38451043 | DOI:10.23938/ASSN.1069

Categories: Literature Watch

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