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Agrawal S, Luan J, Cummings BB, Weiss EJ, Wareham NJ, Khera AV. Relationship of Fat Mass Ratio, a Biomarker for Lipodystrophy, With Cardiometabolic Traits. Diabetes 2024; 73:1099-1111. [PMID: 38345889 PMCID: PMC11189835 DOI: 10.2337/db23-0575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 02/06/2024] [Indexed: 06/22/2024]
Abstract
Familial partial lipodystrophy (FPLD) is a heterogenous group of syndromes associated with a high prevalence of cardiometabolic diseases. Prior work has proposed DEXA-derived fat mass ratio (FMR), defined as trunk fat percentage divided by leg fat percentage, as a biomarker of FPLD, but this metric has not previously been characterized in large cohort studies. We set out to 1) understand the cardiometabolic burden of individuals with high FMR in up to 40,796 participants in the UK Biobank and 9,408 participants in the Fenland study, 2) characterize the common variant genetic underpinnings of FMR, and 3) build and test a polygenic predictor for FMR. Participants with high FMR were at higher risk for type 2 diabetes (odds ratio [OR] 2.30, P = 3.5 × 10-41) and metabolic dysfunction-associated liver disease or steatohepatitis (OR 2.55, P = 4.9 × 10-7) in UK Biobank and had higher fasting insulin (difference 19.8 pmol/L, P = 5.7 × 10-36) and fasting triglycerides (difference 36.1 mg/dL, P = 2.5 × 10-28) in the Fenland study. Across FMR and its component traits, 61 conditionally independent variant-trait pairs were discovered, including 13 newly identified pairs. A polygenic score for FMR was associated with an increased risk of cardiometabolic diseases. This work establishes the cardiometabolic significance of high FMR, a biomarker for FPLD, in two large cohort studies and may prove useful in increasing diagnosis rates of patients with metabolically unhealthy fat distribution to enable treatment or a preventive therapy. ARTICLE HIGHLIGHTS
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Affiliation(s)
- Saaket Agrawal
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA
- Department of Medicine, Massachusetts General Hospital, Boston, MA
- Department of Medicine, Harvard Medical School, Boston, MA
| | - Jian’an Luan
- MRC Epidemiology Unit, Institute of Metabolic Science, University of Cambridge, Cambridge Biomedical Campus, Cambridge, U.K
| | | | | | - Nick J. Wareham
- MRC Epidemiology Unit, Institute of Metabolic Science, University of Cambridge, Cambridge Biomedical Campus, Cambridge, U.K
| | - Amit V. Khera
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA
- Department of Medicine, Harvard Medical School, Boston, MA
- Division of Cardiology, Department of Medicine, Brigham and Women’s Hospital, Boston, MA
- Verve Therapeutics, Boston, MA
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Fourman LT, Lima JG, Simha V, Cappa M, Alyaarubi S, Montenegro R, Akinci B, Santini F. A rapid action plan to improve diagnosis and management of lipodystrophy syndromes. Front Endocrinol (Lausanne) 2024; 15:1383318. [PMID: 38952397 PMCID: PMC11215967 DOI: 10.3389/fendo.2024.1383318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 05/13/2024] [Indexed: 07/03/2024] Open
Abstract
Introduction Lipodystrophy syndromes are rare diseases that can present with a broad range of symptoms. Delays in diagnosis are common, which in turn, may predispose to the development of severe metabolic complications and end-organ damage. Many patients with lipodystrophy syndromes are only diagnosed after significant metabolic abnormalities arise. Prompt action by clinical teams may improve disease outcomes in lipodystrophy syndromes. The aim of the Rapid Action Plan is to serve as a set of recommendations from experts that can support clinicians with limited experience in lipodystrophy syndromes. Methods The Rapid Action Plan was developed using insights gathered through a series of advisory meetings with clinical experts in lipodystrophy syndromes. A skeleton template was used to facilitate interviews. A consensus document was developed, reviewed, and approved by all experts. Results Lipodystrophy is a clinical diagnosis. The Rapid Action Plan discusses tools that can help diagnose lipodystrophy syndromes. The roles of clinical and family history, physical exam, patient and family member photos, routine blood tests, leptin levels, skinfold measurements, imaging studies, and genetic testing are explored. Additional topics such as communicating the diagnosis to the patients/families and patient referrals are covered. A set of recommendations regarding screening and monitoring for metabolic diseases and end-organ abnormalities is presented. Finally, the treatment of lipodystrophy syndromes is reviewed. Discussion The Rapid Action Plan may assist clinical teams with the prompt diagnosis and holistic work-up and management of patients with lipodystrophy syndromes, which may improve outcomes for patients with this rare disease.
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Affiliation(s)
- Lindsay T. Fourman
- Metabolism Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Josivan Gomes Lima
- Hospital Universitário Onofre Lopes, Departamento de Clinica Medica, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - Vinaya Simha
- Division of Endocrinology, Mayo Clinic, Rochester, MN, United States
| | - Marco Cappa
- Research Area for Innovative Therapies in Endocrinopathies Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Saif Alyaarubi
- Pediatric Endocrinology, Oman Medical Specialty Board, Muscat, Oman
| | - Renan Montenegro
- Brazilian Group for the Study of Inherited and Acquired Lipodystrophies (BRAZLIPO), Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará/Ebserh, Fortaleza, Brazil
| | - Baris Akinci
- Dokuz Eylul University Health Campus Technopark (DEPARK), Dokuz Eylul University, Izmir, Türkiye
- Department of Research Programs, Technological Research, Izmir Biomedicine and Genome Center (IBG), Izmir, Türkiye
| | - Ferruccio Santini
- Obesity and Lipodystrophy Center, Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
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Vatier C, Vigouroux C, Mosbah H. Primary disease of adipose tissue: When to think about and how to evaluate it in clinical practice? ANNALES D'ENDOCRINOLOGIE 2024; 85:190-194. [PMID: 38871502 DOI: 10.1016/j.ando.2024.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Primary diseases of adipose tissue are rare disorders resulting from impairments in the physiological functions of adipose tissue (lipid stockage and endocrine function). It mainly refers to lipodystrophy syndromes with subcutaneous adipose tissue atrophy and/or altered body distribution of adipose tissue leading to insulin resistance, diabetes, hepatic steatosis, dyslipidemia, cardiovascular complications and polycystic ovary syndrome in women. Those syndromes are congenital or acquired, and lipoatrophy is partial or generalized. The diagnosis of lipodystrophy syndromes is often unrecognized, delayed and/or inaccurate, while it is of major importance to adapt investigations to search for specific comorbidities, in particular cardiovascular involvement, and set up multidisciplinary care, and in some cases specific treatment. Physicians have to recognize the clinical and biological elements allowing to establish the diagnosis. Lipodystrophic syndromes should be considered, notably, in patients with diabetes at a young age, with a normal or low BMI, negative pancreatic autoantibodies, presenting clinical signs of lipodystrophy and insulin resistance (acanthosis nigricans, hyperandrogenism, hepatic steatosis, high insulin doses). The association of diabetes and a family history of severe and/or early cardiovascular disease (coronary atherosclerosis, cardiomyopathy with rhythm and/or conduction disorders) may reveal Dunnigan syndrome, the most frequent form of familial lipodystrophy, due to LMNA pathogenic variants. Clinical assessment is primarily done through clinical examination: acanthosis nigricans, abnormal adipose tissue distribution, lipoatrophy, muscular hypertrophy, acromegaloid or Cushingoid features, lipomas, highly visible subcutaneous veins, may be revealing signs. The amount of circulating adipokines may reflect of adipose dysfunction with low leptinemia and adiponectinemia. Other biological metabolic parameters (hypertriglyceridemia, hyperinsulinemia, increased glycemia and hepatic enzymes) may also represent markers of insulin resistance. Quantification of total body fat by impedancemetry or dual-photon X-ray absorptiometry (DEXA) reveals decreased total body mass, in correlation with adipose tissue atrophy; metabolic magnetic resonance imaging can also quantify intraperitoneal and abdominal fat and the degree of hepatic steatosis. Histological analysis of adipose tissue showing structural abnormalities should be reserved for clinical research. Acquired lipodystrophic syndromes most often lead to similar clinical phenotype as congenital syndromes with generalized or partial lipoatrophy. The most frequent causes are old anti-HIV therapy or glucocorticoid treatments. Family history, history of treatments and clinical examination, including a careful physical examination, are keys for diagnosis.
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Affiliation(s)
- Camille Vatier
- Service d'endocrinologie, diabétologie et endocrinologie de la reproduction, Centre national de référence des pathologies rares de l'insulino-sécrétion et de l'insulino-sensibilité (PRISIS), hôpital Saint-Antoine, Assistance publique-Hôpitaux de Paris, Paris, France; INSERM UMRS_938, Centre de recherche Saint-Antoine, Institut hospitalo-universitaire de cardiométabolisme et nutrition (ICAN), Sorbonne université, Paris, France.
| | - Corinne Vigouroux
- Service d'endocrinologie, diabétologie et endocrinologie de la reproduction, Centre national de référence des pathologies rares de l'insulino-sécrétion et de l'insulino-sensibilité (PRISIS), hôpital Saint-Antoine, Assistance publique-Hôpitaux de Paris, Paris, France; INSERM UMRS_938, Centre de recherche Saint-Antoine, Institut hospitalo-universitaire de cardiométabolisme et nutrition (ICAN), Sorbonne université, Paris, France
| | - Héléna Mosbah
- INSERM UMRS_938, Centre de recherche Saint-Antoine, Institut hospitalo-universitaire de cardiométabolisme et nutrition (ICAN), Sorbonne université, Paris, France; Service d'endocrinologie, diabétologie, nutrition, Centre de compétence PRISIS, CHU de la Milétrie, Poitiers, France; Inserm, ECEVE UMR 1123, université Paris-Cité, Paris, France
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Chevalier B, Lion G, Semah F, Huglo D. When and how to evaluate adipose tissue in clinical practice? DEXA, impedancemetry. ANNALES D'ENDOCRINOLOGIE 2024; 85:173-174. [PMID: 38871509 DOI: 10.1016/j.ando.2024.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Affiliation(s)
- Benjamin Chevalier
- Service de médecine nucléaire, centre hospitalier universitaire de Lille, Lille, France; Faculté de médecine de l'université de Lille Henri-Warembourg, Lille, France.
| | - Georges Lion
- Service de médecine nucléaire, centre hospitalier universitaire de Lille, Lille, France
| | - Franck Semah
- Service de médecine nucléaire, centre hospitalier universitaire de Lille, Lille, France; Faculté de médecine de l'université de Lille Henri-Warembourg, Lille, France
| | - Damien Huglo
- Service de médecine nucléaire, centre hospitalier universitaire de Lille, Lille, France; Faculté de médecine de l'université de Lille Henri-Warembourg, Lille, France
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Loh WJ, Yaligar J, Hooper AJ, Sadananthan SA, Kway Y, Lim SC, Watts GF, Velan SS, Leow MKS, Khoo J. Clinical and imaging features of women with polygenic partial lipodystrophy: a case series. Nutr Diabetes 2024; 14:3. [PMID: 38321009 PMCID: PMC10847407 DOI: 10.1038/s41387-024-00260-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 01/13/2024] [Accepted: 01/19/2024] [Indexed: 02/08/2024] Open
Abstract
BACKGROUND Familial partial lipodystrophy (FPLD) is an inherited disorder of white adipose tissue that causes premature cardiometabolic disease. There is no clear diagnostic criteria for FPLD, and this may explain the under-detection of this condition. AIM This pilot study aimed to describe the clinical features of women with FPLD and to explore the value of adipose tissue measurements that could be useful in diagnosis. METHODS In 8 women with FPLD and 4 controls, skinfold measurements, DXA and whole-body MRI were undertaken. RESULTS Whole genome sequencing was negative for monogenic metabolic causes, but polygenic scores for partial lipodystrophy were elevated in keeping with FPLD type 1. The mean age of diagnosis of DM was 31 years in the FPLD group. Compared with controls, the FPLD group had increased HOMA-IR (10.3 vs 2.9, p = 0.028) and lower mean thigh skinfold thickness (19.5 mm vs 48.2 mm, p = 0.008). The FPLD group had lower percentage of leg fat and an increased ratio of trunk to leg fat percentage on DXA. By MRI, the FPLD group had decreased subcutaneous adipose tissue (SAT) volume in the femoral and calf regions (p < 0.01); abdominal SAT, visceral adipose tissue, and femoral and calf muscle volumes were not different from controls. CONCLUSION Women with FPLD1 in Singapore have significant loss of adipose but not muscle tissue in lower limbs and have early onset of diabetes. Reduced thigh skinfold, and increased ratio of trunk to leg fat percentage on DXA are potentially clinically useful markers to identify FPLD1.
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Affiliation(s)
- Wann Jia Loh
- Department of Endocrinology, Changi General Hospital, Singapore, Singapore.
- Duke-NUS Medical School, Singapore, Singapore.
| | - Jadegoud Yaligar
- Singapore Institute for Clinical Sciences, Agency for Science Technology and Research, Singapore, Singapore
| | - Amanda J Hooper
- Department of Biochemistry, Pathwest and Fiona Stanley Hospital Network, Perth, Australia
- School of Medicine, University of Western Australia, Perth, Australia
| | - Suresh Anand Sadananthan
- Singapore Institute for Clinical Sciences, Agency for Science Technology and Research, Singapore, Singapore
| | - Yeshe Kway
- Singapore Institute for Clinical Sciences, Agency for Science Technology and Research, Singapore, Singapore
- Departments of Medicine and Physiology, NUS Yong Loo School of Medicine, NUS, Singapore, Singapore
| | - Su Chi Lim
- Diabetes Centre, Admiralty Medical Centre, Singapore, Singapore
| | - Gerald F Watts
- School of Medicine, University of Western Australia, Perth, Australia
- Department of Cardiology and Internal Medicine, Royal Perth Hospital, Perth, Australia
| | - Sambasivam Sendhil Velan
- Singapore Institute for Clinical Sciences, Agency for Science Technology and Research, Singapore, Singapore
- Departments of Medicine and Physiology, NUS Yong Loo School of Medicine, NUS, Singapore, Singapore
| | - Melvin Khee Shing Leow
- Duke-NUS Medical School, Singapore, Singapore
- Singapore Institute for Clinical Sciences, Agency for Science Technology and Research, Singapore, Singapore
- Department of Endocrinology, Tan Tock Seng Hospital, Singapore, Singapore
- LKC School of Medicine, NTU, Singapore, Singapore
| | - Joan Khoo
- Department of Endocrinology, Changi General Hospital, Singapore, Singapore
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Mosbah H, Vatier C, Andriss B, Belalem I, Delemer B, Janmaat S, Jéru I, Le Collen L, Maiter D, Nobécourt E, Vantyghem MC, Vigouroux C, Dumas A. Patients' perspective on the medical pathway from first symptoms to diagnosis in genetic lipodystrophy. Eur J Endocrinol 2024; 190:23-33. [PMID: 38128113 DOI: 10.1093/ejendo/lvad169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/03/2023] [Accepted: 11/21/2023] [Indexed: 12/23/2023]
Abstract
OBJECTIVE Underdiagnosis is an important issue in genetic lipodystrophies, which are rare diseases with metabolic, cardiovascular, gynecological, and psychological complications. We aimed to characterize the diagnostic pathway in these diseases from the patients' perspective. DESIGN Cross-sectional study conducted through a self-reported patient questionnaire. METHODS Patients with genetic lipodystrophy were recruited throughout the French national reference network for rare diseases of insulin secretion and insulin sensitivity. Patients completed a self-reported questionnaire on disease symptoms, steps leading to the diagnosis, and healthcare professionals involved. Descriptive analyses were conducted. RESULTS Out of 175 eligible patients, 109 patients (84% women) were included; 93 had partial familial lipodystrophy and 16 congenital generalized lipodystrophy. Metabolic comorbidities (diabetes 68%, hypertriglyceridemia 66%, hepatic steatosis 57%), cardiovascular (hypertension 54%), and gynecologic complications (irregular menstruation 60%) were frequently reported. Median age at diagnosis was 30 years (interquartile range [IQR] 23-47). The overall diagnostic process was perceived as "very difficult" for many patients. It extended over 12 years (IQR 5-25) with more than five different physicians consulted by 36% of respondents, before diagnosis, for lipodystrophy-related symptoms. The endocrinologist made the diagnosis for 77% of the patients. Changes in morphotype were reported as the first symptoms by the majority of respondents. CONCLUSIONS Diagnostic pathway in patients with genetic lipodystrophy is rendered difficult by the multisystemic features of the disease and the lack of knowledge of non-specialized physicians. Training physicians to systematically include adipose tissue examination in routine clinical evaluation should improve diagnosis and management of lipodystrophy and lipodystrophy-associated comorbidities.
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Affiliation(s)
- Héléna Mosbah
- ECEVE UMR 1123, INSERM, Université Paris Cité, 75014 Paris, France
- Service Endocrinologie, Diabétologie, Nutrition, CHU La Milétrie, 86000 Poitiers, France
- Hôpital Saint-Antoine, Centre de Référence des Maladies Rares de l'Insulino-Sécrétion et de l'Insulino-Sensibilité (PRISIS), Service d'Endocrinologie, Assistance Publique-Hôpitaux de Paris (AP-HP), 75012 Paris, France
| | - Camille Vatier
- Hôpital Saint-Antoine, Centre de Référence des Maladies Rares de l'Insulino-Sécrétion et de l'Insulino-Sensibilité (PRISIS), Service d'Endocrinologie, Assistance Publique-Hôpitaux de Paris (AP-HP), 75012 Paris, France
- Inserm U938, Centre de Recherche Saint-Antoine et Institut de Cardio-Métabolisme et Nutrition (ICAN), Sorbonne Université, 75012 Paris, France
| | - Béatrice Andriss
- Unité d'Epidémiologie Clinique, APHP, Hôpital Universitaire Robert Debré, 75019 Paris, France
| | - Inès Belalem
- Hôpital Saint-Antoine, Centre de Référence des Maladies Rares de l'Insulino-Sécrétion et de l'Insulino-Sensibilité (PRISIS), Service d'Endocrinologie, Assistance Publique-Hôpitaux de Paris (AP-HP), 75012 Paris, France
| | - Brigitte Delemer
- Service d'endocrinologie diabète nutrition, CHU de Reims, Hôpital Robert-Debré, 51100 Reims, France
| | - Sonja Janmaat
- Hôpital Saint-Antoine, Centre de Référence des Maladies Rares de l'Insulino-Sécrétion et de l'Insulino-Sensibilité (PRISIS), Service d'Endocrinologie, Assistance Publique-Hôpitaux de Paris (AP-HP), 75012 Paris, France
- Inserm U938, Centre de Recherche Saint-Antoine et Institut de Cardio-Métabolisme et Nutrition (ICAN), Sorbonne Université, 75012 Paris, France
| | - Isabelle Jéru
- Inserm U938, Centre de Recherche Saint-Antoine et Institut de Cardio-Métabolisme et Nutrition (ICAN), Sorbonne Université, 75012 Paris, France
- Département de Génétique Médicale, DMU BioGeM, Hôpital Pitié-Salpêtrière, AP-HP, 75013 Paris, France
| | - Lauriane Le Collen
- Inserm/CNRS UMR 1283/8199, Institut Pasteur, EGID, Université Lille, 59000 Lille, France
- Service d'endocrinologie diabète nutrition, CHU de Reims, Hôpital Robert-Debré, 51100 Reims, France
- Service de Génétique clinique, Centre hospitalier de Reims, 51100 Reims, France
| | - Dominique Maiter
- Service d'Endocrinologie et Nutrition, Institut de Recherche Expérimentale et Clinique IREC, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, B-1348 Brussels, Belgique
| | - Estelle Nobécourt
- Service d'endocrinologie Diabétologie, Centre Hospitalier Universitaire Sud Réunion, 97410 Saint Pierre, France
| | - Marie-Christine Vantyghem
- Endocrinologie, diabétologie et métabolisme, CHU Lille, 59000 Lille, France
- Inserm U1190, Université Lille, Institut Pasteur, 59000 Lille, France
| | - Corinne Vigouroux
- Hôpital Saint-Antoine, Centre de Référence des Maladies Rares de l'Insulino-Sécrétion et de l'Insulino-Sensibilité (PRISIS), Service d'Endocrinologie, Assistance Publique-Hôpitaux de Paris (AP-HP), 75012 Paris, France
- Inserm U938, Centre de Recherche Saint-Antoine et Institut de Cardio-Métabolisme et Nutrition (ICAN), Sorbonne Université, 75012 Paris, France
| | - Agnes Dumas
- ECEVE UMR 1123, INSERM, Université Paris Cité, 75014 Paris, France
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Clinical Spectrum of LMNA-Associated Type 2 Familial Partial Lipodystrophy: A Systematic Review. Cells 2023; 12:cells12050725. [PMID: 36899861 PMCID: PMC10000975 DOI: 10.3390/cells12050725] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 03/03/2023] Open
Abstract
Type 2 familial partial lipodystrophy (FPLD2) is a laminopathic lipodystrophy due to pathogenic variants in the LMNA gene. Its rarity implies that it is not well-known. The aim of this review was to explore the published data regarding the clinical characterisation of this syndrome in order to better describe FPLD2. For this purpose, a systematic review through a search on PubMed until December 2022 was conducted and the references of the retrieved articles were also screened. A total of 113 articles were included. FPLD2 is characterised by the loss of fat starting around puberty in women, affecting limbs and trunk, and its accumulation in the face, neck and abdominal viscera. This adipose tissue dysfunction conditions the development of metabolic complications associated with insulin resistance, such as diabetes, dyslipidaemia, fatty liver disease, cardiovascular disease, and reproductive disorders. However, a great degree of phenotypical variability has been described. Therapeutic approaches are directed towards the associated comorbidities, and recent treatment modalities have been explored. A comprehensive comparison between FPLD2 and other FPLD subtypes can also be found in the present review. This review aimed to contribute towards augmenting knowledge of the natural history of FPLD2 by bringing together the main clinical research in this field.
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Adiyaman SC, Altay C, Kamisli BY, Avci ER, Basara I, Simsir IY, Atik T, Secil M, Oral EA, Akinci B. Pelvis magnetic resonance imaging to diagnose familial partial lipodystrophy. J Clin Endocrinol Metab 2023:7049389. [PMID: 36808247 DOI: 10.1210/clinem/dgad063] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/24/2023] [Accepted: 01/27/2023] [Indexed: 02/23/2023]
Abstract
CONTEXT The diagnosis of familial partial lipodystrophy (FPLD) is currently made based on clinical judgement. OBJECTIVE There is a need for objective diagnostic tools that can diagnose FPLD accurately. METHODS We have developed a new method that used measurements from pelvic magnetic resonance imaging (MRI) at the pubis level. We evaluated measurements from a lipodystrophy cohort (n = 59; median age [25-75 percentiles]: 32 [24-44]; 48 females and 11 males) and age- and gender-matched controls (n = 29). Another dataset included MRIs from 289 consecutive patients. RESULTS Receiver operating characteristic curve (ROC) analysis revealed a potential cut-point of ≤ 13 mm gluteal fat thickness for the diagnosis of FPLD. A combination of gluteal fat thickness ≤ 13 mm and pubic/gluteal fat ratio ≥ 2.5 (based on a ROC) provided 96.67% (95% Confidence Interval [CI]: 82.78-99.92%) sensitivity and 91.38% (95% CI: 81.02-97.14%) specificity in the overall cohort and 100.00% (95% CI: 87.23-100.00%) sensitivity and 90.00% (95% CI: 76.34-97.21%) specificity in females for the diagnosis of FPLD. When this approach was tested in a larger dataset of random patients, FPLD was differentiated from subjects without lipodystrophy with 96.67% (95% CI: 82.78-99.92%) sensitivity and 100.00% (95% CI: 98.73-100.00%) specificity. When only women were analyzed, the sensitivity and the specificity was 100.00% (95%CI: 87.23-100.00% and 97.95-100.00%, respectively). The performance of gluteal fat thickness and pubic/gluteal fat thickness ratio was comparable to readouts performed by radiologists with expertise in lipodystrophy. CONCLUSION The combined use of gluteal fat thickness and pubic/gluteal fat ratio from pelvic MRI is a promising method to diagnose FPLD that can reliably identify FPLD in women. Our findings need to be tested in larger populations and prospectively.
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Affiliation(s)
- Suleyman Cem Adiyaman
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Canan Altay
- Department of Radiology, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Berfu Y Kamisli
- Department of Internal Medicine, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Emre Ruhat Avci
- Department of Radiology, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Isil Basara
- Department of Radiology, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Ilgin Yildirim Simsir
- Division of Endocrinology, Department of Internal Medicine, Ege University School of Medicine, Izmir, Turkey
| | - Tahir Atik
- Department of Pediatric Genetics, Ege University School of Medicine, Izmir, Turkey
| | - Mustafa Secil
- Department of Radiology, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Elif A Oral
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, USA
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Loss of Mature Lamin A/C Triggers a Shift in Intracellular Metabolic Homeostasis via AMPKα Activation. Cells 2022; 11:cells11243988. [PMID: 36552752 PMCID: PMC9777081 DOI: 10.3390/cells11243988] [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: 08/21/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
The roles of lamin A/C in adipocyte differentiation and skeletal muscle lipid metabolism are associated with familial partial lipodystrophy of Dunnigan (FPLD). We confirmed that LMNA knockdown (KD) in mouse adipose-derived mesenchymal stem cells (AD-MSCs) prevented adipocyte maturation. Importantly, in in vitro experiments, we discovered a significant increase in phosphorylated lamin A/C levels at serine 22 or 392 sites (pLamin A/C-S22/392) accompanying increased lipid synthesis in a liver cell line (7701 cells) and two hepatocellular carcinoma (HCC) cell lines (HepG2 and MHCC97-H cells). Moreover, HCC cells did not survive after LMNA knockout (KO) or even KD. Evidently, the functions of lamin A/C differ between the liver and adipose tissue. To date, the mechanism of hepatocyte lipid metabolism mediated by nuclear lamin A/C remains unclear. Our in-depth study aimed to identify the molecular connection between lamin A/C and pLamin A/C, hepatic lipid metabolism and liver cancer. Gain- and loss-of-function experiments were performed to investigate functional changes and the related molecular pathways in 7701 cells. Adenosine 5' monophosphate-activated protein kinase α (AMPKα) was activated when abnormalities in functional lamin A/C were observed following lamin A/C depletion or farnesyltransferase inhibitor (FTI) treatment. Active AMPKα directly phosphorylated acetyl-CoA-carboxylase 1 (ACC1) and subsequently inhibited lipid synthesis but induced glycolysis in both HCC cells and normal cells. According to the mass spectrometry analysis, lamin A/C potentially regulated AMPKα activation through its chaperone proteins, ATPase or ADP/ATP transporter 2. Lonafarnib (an FTI) combined with low-glucose conditions significantly decreased the proliferation of the two HCC cell lines more efficiently than lonafarnib alone by inhibiting glycolysis or the maturation of prelamin A.
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Abstract
PURPOSE OF REVIEW Genetic or acquired lipodystrophies are characterized by selective loss of body fat along with predisposition towards metabolic complications of insulin resistance, such as diabetes mellitus, hypertriglyceridemia, hepatic steatosis, polycystic ovarian syndrome, and acanthosis nigricans. In this review, we discuss the various subtypes and when to suspect and how to diagnose lipodystrophy. RECENT FINDINGS The four major subtypes are autosomal recessive, congenital generalized lipodystrophy (CGL); acquired generalized lipodystrophy (AGL), mostly an autoimmune disorder; autosomal dominant or recessive familial partial lipodystrophy (FPLD); and acquired partial lipodystrophy (APL), an autoimmune disorder. Diagnosis of lipodystrophy is mainly based upon physical examination findings of loss of body fat and can be supported by body composition analysis by skinfold measurements, dual-energy x-ray absorptiometry, and whole-body magnetic resonance imaging. Confirmatory genetic testing is helpful in the proband and at-risk family members with suspected genetic lipodystrophies. The treatment is directed towards the specific comorbidities and metabolic complications, and there is no treatment to reverse body fat loss. Metreleptin should be considered as the first-line therapy for metabolic complications in patients with generalized lipodystrophy and for prevention of comorbidities in children. Metformin and insulin therapy are the best options for treating hyperglycemia and fibrates and/or fish oil for hypertriglyceridemia. Lipodystrophy should be suspected in lean and muscular subjects presenting with diabetes mellitus, hypertriglyceridemia, non-alcoholic fatty liver disease, polycystic ovarian syndrome, or amenorrhea. Diabetologists should be aware of lipodystrophies and consider genetic varieties as an important subtype of monogenic diabetes.
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Affiliation(s)
- Nivedita Patni
- Division of Pediatric Endocrinology, Department of Pediatrics, UT Southwestern Medical Center, Dallas, TX, USA
| | - Abhimanyu Garg
- Division of Nutrition and Metabolic Diseases, Department of Internal Medicine and the Center for Human Nutrition, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-8537, USA.
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11
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Mosbah H, Donadille B, Vatier C, Janmaat S, Atlan M, Badens C, Barat P, Béliard S, Beltrand J, Ben Yaou R, Bismuth E, Boccara F, Cariou B, Chaouat M, Charriot G, Christin-Maitre S, De Kerdanet M, Delemer B, Disse E, Dubois N, Eymard B, Fève B, Lascols O, Mathurin P, Nobécourt E, Poujol-Robert A, Prevost G, Richard P, Sellam J, Tauveron I, Treboz D, Vergès B, Vermot-Desroches V, Wahbi K, Jéru I, Vantyghem MC, Vigouroux C. Dunnigan lipodystrophy syndrome: French National Diagnosis and Care Protocol (PNDS; Protocole National de Diagnostic et de Soins). Orphanet J Rare Dis 2022; 17:170. [PMID: 35440056 PMCID: PMC9019936 DOI: 10.1186/s13023-022-02308-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 03/24/2022] [Indexed: 11/29/2022] Open
Abstract
Dunnigan syndrome, or Familial Partial Lipodystrophy type 2 (FPLD2; ORPHA 2348), is a rare autosomal dominant disorder due to pathogenic variants of the LMNA gene. The objective of the French National Diagnosis and Care Protocol (PNDS; Protocole National de Diagnostic et de Soins), is to provide health professionals with a guide to optimal management and care of patients with FPLD2, based on a critical literature review and multidisciplinary expert consensus. The PNDS, written by members of the French National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), is available on the French Health Authority website (in French). Dunnigan syndrome is characterized by a partial atrophy of the subcutaneous adipose tissue and by an insulin resistance syndrome, associated with a risk of metabolic, cardiovascular and muscular complications. Its prevalence, assessed at 1/100.000 in Europe, is probably considerably underestimated. Thorough clinical examination is key to diagnosis. Biochemical testing frequently shows hyperinsulinemia, abnormal glucose tolerance and hypertriglyceridemia. Elevated hepatic transaminases (hepatic steatosis) and creatine phosphokinase, and hyperandrogenism in women, are common. Molecular analysis of the LMNA gene confirms diagnosis and allows for family investigations. Regular screening and multidisciplinary monitoring of the associated complications are necessary. Diabetes frequently develops from puberty onwards. Hypertriglyceridemia may lead to acute pancreatitis. Early atherosclerosis and cardiomyopathy should be monitored. In women, polycystic ovary syndrome is common. Overall, the management of patients with Dunnigan syndrome requires the collaboration of several health care providers. The attending physician, in conjunction with the national care network, will ensure that the patient receives optimal care through regular follow-up and screening. The various elements of this PNDS are described to provide such a support.
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Affiliation(s)
- H Mosbah
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - B Donadille
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France
| | - C Vatier
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - S Janmaat
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - M Atlan
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Plastic Surgery Department, Assistance Publique-Hôpitaux de Paris, Tenon Hospital, Paris, France
| | - C Badens
- Department of Genetics, Assistance Publique-Hôpitaux de Marseille, Marseille, France
| | - P Barat
- Pediatric Endocrinology Unit, Bordeaux University Hospitals, Bordeaux, France
| | - S Béliard
- Nutrition Department, Assistance Publique-Hôpitaux de Marseille, La Conception Hospital, Marseille, France
| | - J Beltrand
- Paediatric Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Necker Hospital, Paris University, Paris, France
| | - R Ben Yaou
- Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Myology Institute, Sorbonne University, Paris, France
| | - E Bismuth
- Paediatric Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, Paris University, Paris, France
| | - F Boccara
- Cardiology Department, Assistance Publique-Hôpitaux de Paris, St Antoine Hospital, Sorbonne University, Paris, France
| | - B Cariou
- Endocrinology Department, Nantes University Hospitals, Guillaume et René Laennec Hospital, Nantes University, Nantes, France
| | - M Chaouat
- Plastic Surgery Department, Assistance Publique-Hôpitaux de Paris, St Louis Hospital, Paris University, Paris, France
| | - G Charriot
- French Lipodystrophy Association (AFLIP; Association Française des Lipodystrophies), Pierrevert, France
| | - S Christin-Maitre
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Sorbonne University, Inserm UMR_S933, Paris, France
| | - M De Kerdanet
- Paediatric Endocrinology Department, Rennes University Hospitals, South Hospital, Rennes, France
| | - B Delemer
- Endocrinology Department, Reims University Hospitals, Robert Debré Hospital, Reims, France
| | - E Disse
- Endocrinology Department, Lyon University Hospitals, South Lyon Civil Hospital, Lyon University, Pierre Benite, France
| | - N Dubois
- Nutrition Department, Assistance Publique-Hôpitaux de Marseille, La Conception Hospital, Marseille, France
| | - B Eymard
- Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Myology Institute, Sorbonne University, Paris, France
| | - B Fève
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - O Lascols
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - P Mathurin
- Hepatology Department, Lille 2 University Hospitals, Lille University, Lille, France
| | - E Nobécourt
- Endocrinology Department, La Reunion University Hospitals, Reunion South Hospital, St Pierre de la Reunion, France
| | - A Poujol-Robert
- Hepatology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine Hospital, Sorbonne University, Paris, France
| | - G Prevost
- Endocrinology Department, Rouen University Hospitals, Bois-Guillaume Hospital, Rouen, France
| | - P Richard
- Cardiogenetics and Myogenetics Department, Assistance Publique-Hôpitaux de Paris, Pitie Salpêtrière Hospital, Sorbonne University, Paris, France
| | - J Sellam
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Rhumatology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine Hospital, Sorbonne University, Paris, France
| | - I Tauveron
- Endocrinology Department, Clermont-Ferrand University Hospital, Clermont Auvergne University, Clermont-Ferrand, France
| | - D Treboz
- French Lipodystrophy Association (AFLIP; Association Française des Lipodystrophies), Pierrevert, France
| | - B Vergès
- Endocrinology-Diabetology Department, Dijon University Hospital, François Mitterand Hospital, Bourgogne University, Dijon, France
| | - V Vermot-Desroches
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France
| | - K Wahbi
- Cardiology Department, Assistance Publique-Hôpitaux de Paris, Cochin Hospital, Paris University, Paris, France
| | - I Jéru
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - M C Vantyghem
- Endocrinology Department, Lille 2 University Hospitals, Lille University, Lille, France
| | - C Vigouroux
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France. .,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France. .,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France.
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12
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Fernández-Pombo A, Sánchez-Iglesias S, Cobelo-Gómez S, Hermida-Ameijeiras Á, Araújo-Vilar D. Familial partial lipodystrophy syndromes. Presse Med 2021; 50:104071. [PMID: 34610417 DOI: 10.1016/j.lpm.2021.104071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 08/18/2021] [Indexed: 12/14/2022] Open
Abstract
Lipodystrophies are a heterogeneous group of rare conditions characterised by the loss of adipose tissue. The most common forms are the familial partial lipodystrophy (FPLD) syndromes, which include a set of disorders, usually autosomal dominant, due to different pathogenetic mechanisms leading to improper fat distribution (loss of fat in the limbs and gluteal region and variable regional fat accumulation). Affected patients are prone to suffering serious morbidity via the development of metabolic complications associated to insulin resistance and an inability to properly store lipids. Although no well-defined diagnostic criteria have been established for lipodystrophy, there are certain clues related to medical history, physical examination and body composition evaluation that may suggest FPLD prior to confirmatory genetic analysis. Its treatment must be fundamentally oriented towards the control of the metabolic abnormalities. In this sense, metreleptin therapy, the newer classes of hypoglycaemic agents and other investigational drugs are showing promising results. This review aims to summarise the current knowledge of FPLD syndromes and to describe their clinical and molecular picture, diagnostic approaches and recent treatment modalities.
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Affiliation(s)
- Antía Fernández-Pombo
- UETeM-Molecular Pathology of Rare Diseases Group, Department of Psychiatry, Radiology, Public Health, Nursing and Medicine, IDIS-CiMUS, University of Santiago de Compostela, Santiago de Compostela 15782, Spain; Division of Endocrinology and Nutrition, University Clinical Hospital of Santiago de Compostela, 15706, Spain
| | - Sofía Sánchez-Iglesias
- UETeM-Molecular Pathology of Rare Diseases Group, Department of Psychiatry, Radiology, Public Health, Nursing and Medicine, IDIS-CiMUS, University of Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Silvia Cobelo-Gómez
- UETeM-Molecular Pathology of Rare Diseases Group, Department of Psychiatry, Radiology, Public Health, Nursing and Medicine, IDIS-CiMUS, University of Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Álvaro Hermida-Ameijeiras
- UETeM-Molecular Pathology of Rare Diseases Group, Department of Psychiatry, Radiology, Public Health, Nursing and Medicine, IDIS-CiMUS, University of Santiago de Compostela, Santiago de Compostela 15782, Spain; Division of Internal Medicine, University Clinical Hospital of Santiago de Compostela, 15706, Spain
| | - David Araújo-Vilar
- UETeM-Molecular Pathology of Rare Diseases Group, Department of Psychiatry, Radiology, Public Health, Nursing and Medicine, IDIS-CiMUS, University of Santiago de Compostela, Santiago de Compostela 15782, Spain; Division of Endocrinology and Nutrition, University Clinical Hospital of Santiago de Compostela, 15706, Spain.
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13
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Partial Lipodystrophy and LMNA p.R545H Variant. J Clin Med 2021; 10:jcm10051142. [PMID: 33803191 PMCID: PMC7963176 DOI: 10.3390/jcm10051142] [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: 01/29/2021] [Revised: 02/27/2021] [Accepted: 03/02/2021] [Indexed: 11/16/2022] Open
Abstract
Laminopathies are disorders caused by LMNA gene mutations, which selectively affect different tissues and organ systems, and present with heterogeneous clinical and pathological traits. The molecular mechanisms behind these clinical differences and tissue specificity have not been fully clarified. We herein examine the case of a patient carrying a heterozygous LMNA c.1634G>A (p.R545H) variant with a mild, transient myopathy, who was referred to our center for the suspicion of lipodystrophy. At physical examination, an abnormal distribution of subcutaneous fat was noticed, with fat accumulation in the anterior regions of the neck, resembling the fat distribution pattern of familial partial lipodystrophy type 2 (FPLD2). The R545H missense variant has been found at very low allelic frequency in public databases, and in silico analysis showed that this amino acid substitution is predicted to have a damaging role. Other patients carrying the heterozygous LMNA p.R545H allele have shown a marked clinical heterogeneity in terms of phenotypic body fat distribution and severity of organ system involvement. These findings indicate that the LMNA p.R545H heterozygous variant exhibits incomplete penetrance and highly variable expressivity. We hypothesized that additional genetic factors, epigenetic mechanisms, or environmental triggers might explain the variable expressivity of phenotypes among various patients.
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