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Salhi S, Doreille A, Dancer MS, Boueilh A, Filipozzi P, El Karoui K, Ponce F, Lebre AS, Raymond L, Mesnard L. Monoallelic Loss-of-Function IFT140 Pathogenic Variants Cause Autosomal Dominant Polycystic Kidney Disease: A Confirmatory Study With Suspicion of an Additional Cardiac Phenotype. Am J Kidney Dis 2024; 83:688-691. [PMID: 37844724 DOI: 10.1053/j.ajkd.2023.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 07/28/2023] [Accepted: 08/27/2023] [Indexed: 10/18/2023]
Abstract
Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disease. While biallelic variants affecting IFT140 are responsible for Mainzer-Saldino syndrome (characterized by severe ciliopathy causing skeletal abnormalities, kidney disease, and cysts), monoallelic loss-of-function (LoF) variants have been recently reported as an important cause of ADPKD beyond PKD1/2 genes. Herein, we report 6 non-family-related cases of monoallelic IFT140 LoF variants, identified from 1,340 exomes sequenced for nephrological indications in our local database. Every patient presented with polycystic kidney disease. Furthermore, the mother of a boy diagnosed with Mainzer-Saldino syndrome with a biallelic variant affecting IFT140 presented with several bilateral cysts, revealed after kidney imaging, and was found to carry a pathologic frameshift IFT140 variation. As well as this particular Mainzer-Saldino case, our 6 additional patients confirm that heterozygous IFT140 frameshift variants are responsible for the cystic phenotype and kidney failure. Interestingly, of the 6 patients, 2 also exhibited dilated cardiomyopathy, which was of unknown origin, as no genetic cause was found after exome sequencing analysis, suggesting a potential connection between IFT140 and heart disease.
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Affiliation(s)
- Sofiane Salhi
- Service des Soins intensifs Néphrologiques et Rein Aigu, Hôpital Tenon, Assistance Publique- Hôpitaux de Paris, Paris, France; Université Paul Sabatier - Toulouse 3, Toulouse, France; Toulouse, France Department of Nephrology and Organ Transplantation, Centre for Rare Kidney Diseases, University Hospital of Toulouse, Toulouse, France
| | - Alice Doreille
- Service des Soins intensifs Néphrologiques et Rein Aigu, Hôpital Tenon, Assistance Publique- Hôpitaux de Paris, Paris, France; Faculté de médecine, Sorbonne Université, Paris, France
| | | | - Anna Boueilh
- Service de Néphrologie, Hôpital Henri Mondor, Université Paris Est Créteil, Assistance Publique- Hôpitaux de Paris, Paris, France
| | - Pierre Filipozzi
- Service de Néphrologie, Hôpital Robert Schuman, Association Saint-André, Metz, France
| | - Khalil El Karoui
- Service de Néphrologie et Dialyses, Hôpital Tenon, Assistance Publique- Hôpitaux de Paris, Paris, France
| | - Fanny Ponce
- Centre Hospitalier Universitaire de Reims, Pôle de biologie médicale et pathologie, Service de génétique, Reims, France et Université Reims Champagne Ardenne (URCA), Reims, France
| | - Anne-Sophie Lebre
- Centre Hospitalier Universitaire de Reims, Pôle de biologie médicale et pathologie, Service de génétique, Reims, France et Université Reims Champagne Ardenne (URCA), Reims, France; Department of Medical Genetics, AP-HP Sorbonne University, Paris, France
| | - Laure Raymond
- Laboratoire de Génétique, Eurofins Biomnis, Lyon, France
| | - Laurent Mesnard
- Service des Soins intensifs Néphrologiques et Rein Aigu, Hôpital Tenon, Assistance Publique- Hôpitaux de Paris, Paris, France; Faculté de médecine, Sorbonne Université, Paris, France; Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche S1155, Paris, France; Institut des Sciences du Calcul et des Données, Sorbonne Université, Paris, France; French National Center for Hereditary Kidney Diseases in Children and Adults (MARHEA).
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Serveaux Dancer M, Marmontel O, Wozny AS, Marcais C, Mahl M, Dumont S, Simonet T, Moulin P, Di Filippo M, Charrière S. Involvement of a homozygous exon 6 deletion of LMF1 gene in intermittent severe hypertriglyceridemia. J Clin Lipidol 2020; 14:756-761. [PMID: 33039347 DOI: 10.1016/j.jacl.2020.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 09/10/2020] [Accepted: 09/14/2020] [Indexed: 11/16/2022]
Abstract
Severe hypertriglyceridemia (HTG), characterized by triglycerides (TG) permanently over 10 mmol/L, may correspond to familial chylomicronemia syndrome (FCS), a rare disorder. However, hypertriglyceridemic patients more often present multifactorial chylomicronemia syndrome (MCS), characterized by highly variable TG. A few nonsense variants of LMF1 gene were reported in literature in FCS patients. In this study, we described a woman with an intermittent severe HTG. NGS analysis and the sequencing of a long range PCR product revealed a homozygous deletion of 6507 base pairs in LMF1 gene, c.730-1528_898-3417del, removing exon 6, predicted to create an in-frame deletion of 56 amino acids, p.(Thr244_Gln299del). Despite an exon 6 homozygous deletion of LMF1, the patient's highly variable lipid phenotype was suggestive of MCS diagnosis.
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Affiliation(s)
- Marine Serveaux Dancer
- Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie Moléculaire et Métabolique, Pierre-Bénite Cedex, France
| | - Oriane Marmontel
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Oullins Cedex, France; Hospices Civils de Lyon, Groupement Hospitalier Est, Service de Biochimie et Biologie Moléculaire Grand Est, Bron Cedex, France
| | - Anne-Sophie Wozny
- Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie Moléculaire et Métabolique, Pierre-Bénite Cedex, France
| | - Christophe Marcais
- Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie Moléculaire et Métabolique, Pierre-Bénite Cedex, France; INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Oullins Cedex, France
| | - Muriel Mahl
- Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie Moléculaire et Métabolique, Pierre-Bénite Cedex, France
| | - Sabrina Dumont
- Hospices Civils de Lyon, Groupement Hospitalier Est, Service de Biochimie et Biologie Moléculaire Grand Est, Bron Cedex, France
| | - Thomas Simonet
- Hospices Civils de Lyon, Cellule BioInformatique, Bron Cedex, France
| | - Philippe Moulin
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Oullins Cedex, France; Hospices Civils de Lyon, Hôpital Louis Pradel, Fédération d'endocrinologie, Maladies Métaboliques, Diabète et Nutrition, Bron Cedex, France
| | - Mathilde Di Filippo
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Oullins Cedex, France; Hospices Civils de Lyon, Groupement Hospitalier Est, Service de Biochimie et Biologie Moléculaire Grand Est, Bron Cedex, France
| | - Sybil Charrière
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Oullins Cedex, France; Hospices Civils de Lyon, Hôpital Louis Pradel, Fédération d'endocrinologie, Maladies Métaboliques, Diabète et Nutrition, Bron Cedex, France.
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Serveaux Dancer M, Di Filippo M, Marmontel O, Valéro R, Piombo Rivarola MDC, Peretti N, Caussy C, Krempf M, Vergès B, Mahl M, Marçais C, Moulin P, Charrière S. New rare genetic variants of LMF1 gene identified in severe hypertriglyceridemia. J Clin Lipidol 2018; 12:1244-1252. [PMID: 30037590 DOI: 10.1016/j.jacl.2018.06.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 06/20/2018] [Accepted: 06/28/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND The LMF1 (lipase maturation factor 1) gene encodes a protein involved in lipoprotein lipase and hepatic lipase maturation. Homozygous mutations in LMF1 leading to severe hypertriglyceridemia (SHTG) are rare in the literature. A few additional rare LMF1 variants have been described with poor functional studies. OBJECTIVE The aim of this study was to assess the frequency of LMF1 variants in a cohort of 385 patients with SHTG, without homozygous or compound heterozygous deleterious mutations identified in lipoprotein lipase (LPL), apolipoprotein A5 (APOA5), apolipoprotein C2 (APOC2), glycosylphosphatidylinositol-anchored high-density lipoprotein binding protein 1 (GPIHBP1) genes, and to determine their functionality. METHODS LMF1 coding variants were screened using denaturing high-performance liquid chromatography followed by direct sequencing. In silico studies of LMF1 variants were performed, followed by in vitro functional studies using human embryonic kidney 293T (HEK-293T) cells cotransfected with vectors encoding human LPL and LMF1 cDNA. LPL activity was measured in cell culture medium after heparin addition using human VLDL-TG as substrate. RESULTS Nineteen nonsynonymous coding LMF1 variants were identified in 65 patients; 10 variants were newly described in SHTG. In vitro, p.Gly172Arg, p.Arg354Trp, p.Arg364Gln, and p.Arg537Trp LMF1 variants decreased LPL activity, and the p.Trp464Ter variant completely abolished LPL activity. We identified a young girl heterozygote for the p.Trp464Ter variant and a homozygote carrier of the p.Gly172Arg variant with a near 50% decreased LPL activity in vitro and in vivo. CONCLUSION The study confirms the rarity of LMF1 variants in a large cohort of patients with SHTG. LMF1 variants are likely to be involved in multifactorial hyperchylomicronemia. Partial LMF1 defects could be associated with intermittent phenotype as described for p.Gly172Arg homozygous and p.Trp464Ter heterozygous carriers.
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Affiliation(s)
- Marine Serveaux Dancer
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie moléculaire et métabolique, Pierre-Bénite, France
| | - Mathilde Di Filippo
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Service de Biochimie et Biologie moléculaire Grand Est, Hospices Civils de Lyon, Groupement Hospitalier Est, Bron, France
| | - Oriane Marmontel
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Service de Biochimie et Biologie moléculaire Grand Est, Hospices Civils de Lyon, Groupement Hospitalier Est, Bron, France
| | - René Valéro
- Université d'Aix-Marseille, C2VN, INSERM UMR1062, INRA UMR1260, APHM, service de nutrition, maladies métaboliques, endocrinologie Hôpital La Conception, Marseille, France
| | | | - Noël Peretti
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Hôpital Femme Mère Enfant, Service d'Hépato-Gastroentérologie Nutrition pédiatrique, Bron, France
| | - Cyrielle Caussy
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Hôpital Lyon Sud, Service d'endocrinologie, diabète, nutrition, Centre Intégré de l'Obésité Rhône-Alpes, Fédération Hospitalo-Universitaire DO-iT, Lyon, Pierre-Bénite, France
| | - Michel Krempf
- CHU de Nantes, Hôpital de l'Hôtel Dieu, Service d'endocrinologie, maladies métaboliques et nutrition, Institut du thorax, Centre de Recherche en Nutrition Humaine, INRA, UMR 1280, Physiologie des Adaptations Nutritionnelles, Nantes, France
| | - Bruno Vergès
- CHU de Dijon, Service d'endocrinologie-diabétologie, INSERM LNC-UMR 1231, Dijon, France
| | - Murielle Mahl
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie moléculaire et métabolique, Pierre-Bénite, France
| | - Christophe Marçais
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Centre de Biologie Sud, Laboratoire de Biochimie moléculaire et métabolique, Pierre-Bénite, France
| | - Philippe Moulin
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Hôpital Louis Pradel, Fédération d'endocrinologie, maladies métaboliques, diabète et nutrition, Bron, France
| | - Sybil Charrière
- INSERM U1060, Laboratoire Carmen, Université Lyon 1, INRA U1235, INSA de Lyon, CENS, Centre de Recherche en Nutrition Humaine Rhône Alpes, Villeurbanne, Oullins, France; Hospices Civils de Lyon, Hôpital Louis Pradel, Fédération d'endocrinologie, maladies métaboliques, diabète et nutrition, Bron, France.
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