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Perge K, Capel E, Villanueva C, Gautheron J, Diallo S, Auclair M, Rondeau S, Morichon R, Brioude F, Jéru I, Rossi M, Nicolino M, Vigouroux C. Ciliopathy due to POC1A deficiency: clinical and metabolic features, and cellular modeling. Eur J Endocrinol 2024; 190:151-164. [PMID: 38245004 DOI: 10.1093/ejendo/lvae009] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 01/08/2024] [Accepted: 01/15/2024] [Indexed: 01/22/2024]
Abstract
OBJECTIVE SOFT syndrome (MIM#614813), denoting Short stature, Onychodysplasia, Facial dysmorphism, and hypoTrichosis, is a rare primordial dwarfism syndrome caused by biallelic variants in POC1A, encoding a centriolar protein. SOFT syndrome, characterized by severe growth failure of prenatal onset and dysmorphic features, was recently associated with insulin resistance. This study aims to further explore its endocrinological features and pathophysiological mechanisms. DESIGN/METHODS We present clinical, biochemical, and genetic features of 2 unrelated patients carrying biallelic pathogenic POC1A variants. Cellular models of the disease were generated using patients' fibroblasts and POC1A-deleted human adipose stem cells. RESULTS Both patients present with clinical features of SOFT syndrome, along with hyperinsulinemia, diabetes or glucose intolerance, hypertriglyceridemia, liver steatosis, and central fat distribution. They also display resistance to the effects of IGF-1. Cellular studies show that the lack of POC1A protein expression impairs ciliogenesis and adipocyte differentiation, induces cellular senescence, and leads to resistance to insulin and IGF-1. An altered subcellular localization of insulin receptors and, to a lesser extent, IGF1 receptors could also contribute to resistance to insulin and IGF1. CONCLUSIONS Severe growth retardation, IGF-1 resistance, and centripetal fat repartition associated with insulin resistance-related metabolic abnormalities should be considered as typical features of SOFT syndrome caused by biallelic POC1A null variants. Adipocyte dysfunction and cellular senescence likely contribute to the metabolic consequences of POC1A deficiency. SOFT syndrome should be included within the group of monogenic ciliopathies with metabolic and adipose tissue involvement, which already encompasses Bardet-Biedl and Alström syndromes.
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Affiliation(s)
- Kevin Perge
- Pediatric Endocrinology, Diabetology and Metabolism Department, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Bron F69500, France
- Claude Bernard University, Lyon 1, Lyon F69100, France
| | - Emilie Capel
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
| | - Carine Villanueva
- Pediatric Endocrinology, Diabetology and Metabolism Department, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Bron F69500, France
| | - Jérémie Gautheron
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
| | - Safiatou Diallo
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
| | - Martine Auclair
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
| | - Sophie Rondeau
- Department of Molecular Biology, Assistance Publique-Hôpitaux de Paris, Necker Enfants Malades Hospital, Paris F75015, France
| | - Romain Morichon
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
- Cytometry and Imagery platform Saint-Antoine (CISA), Inserm UMS30 Lumic, Paris F75012, France
| | - Frédéric Brioude
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Armand Trousseau University Hospital, Paris F75012, France
| | - Isabelle Jéru
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris F75012, France
| | - Massimiliamo Rossi
- Genetics Department, Referral Center for Skeletal Dysplasias, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Lyon F69500, France
- UMR5292, Lyon Neuroscience Research Center, INSERM U1028, CNRS, GENDEV Team, Bron F69500, France
| | - Marc Nicolino
- Pediatric Endocrinology, Diabetology and Metabolism Department, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Bron F69500, France
- Claude Bernard University, Lyon 1, Lyon F69100, France
| | - Corinne Vigouroux
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre, and Institute of Cardiometabolism and Nutrition, F75012 Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris F75012, France
- Department of Endocrinology, Diabetology and Reproductive Endocrinology, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris F75012, France
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Batu Oto B, Ağırbaşlı D, Kılıçarslan O, Celik G, Kalayci Yigin A, Seven M, Yetik H. Pigmentary retinopathy with perivascular sparing in a SOFT syndrome patient with a novel homozygous splicing variant in POC1A gene. Ophthalmic Genet 2023; 44:70-73. [PMID: 35930384 DOI: 10.1080/13816810.2022.2103837] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE SOFT syndrome is an extremely rare inherited dwarfism syndrome. The syndrome has four major clinical manifestations: short stature, onychodysplasia, facial dysmorphism, and hypotrichosis. Herein, we report a unique case of a SOFT syndrome with findings of pigmentary retinopathy. METHODS Case report. RESULTS A 3-year boy was referred to our clinic for ophthalmologic examination from Genetic Diseases Diagnosis Center. In ophthalmic examination, anterior segment was normal bilaterally in biomicroscopy. Fundus examination revealed bilateral yellow-white punctate retinal pigment epithelium lesions located in the midperipheral retina. Macula optical coherence tomography was bilaterally normal. Whole exome sequencing (WES) analysis revealed a homozygous intronic splice site variant (c.103 + 1 G>T) in POC1A, hemizygous intronic splice site variant (c.459-5T>A) in TBX22, and a heterozygous missense variant (c.2254 C>T) in DDR2 genes. CONCLUSION There is a limited number of reported cases with SOFT syndrome and, though retinal findings in SOFT syndrome have been reported in two cases previously, none were given in detail. According to our findings, perivascular and macula sparing midperipheral retina pigment epithelium changes could be observed in patients with SOFT syndrome.
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Affiliation(s)
- Bilge Batu Oto
- Department of Ophthalmology, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
| | - Deniz Ağırbaşlı
- Department of Medical Genetics, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
| | - Oğuzhan Kılıçarslan
- Department of Ophthalmology, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
| | - Gökhan Celik
- Department of Ophthalmology, ROP Screening, Treatment and Training Center, Zeynep Kamil Maternity and Children's Disease Training and Research Hospital, Istanbul, Turkey
| | - Aysel Kalayci Yigin
- Department of Medical Genetics, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
| | - Mehmet Seven
- Department of Medical Genetics, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
| | - Hüseyin Yetik
- Department of Ophthalmology, Cerrahpasa Medical Faculty, Istanbul University- Cerrahpasa, Istanbul, Turkey
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Li G, Chang G, Wang C, Yu T, Li N, Huang X, Wang X, Wang J, Wang J, Yao R. Identification of SOFT syndrome caused by a pathogenic homozygous splicing variant of POC1A: a case report. BMC Med Genomics 2021; 14:207. [PMID: 34419044 PMCID: PMC8379828 DOI: 10.1186/s12920-021-01055-1] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 08/12/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Pathogenic variants in POC1A led to SOFT syndrome and variant POC1A-related (vPOC1A) syndrome. SOFT syndrome is a rare primordial dwarfism condition characterized by short stature, onychodysplasia, facial dysmorphism and hypotrichosis.The main clinical differences between SOFT and vPOC1A syndrome include dyslipidemia with insulin resistance and acanthosis nigricans. To our knowledge, this is the first report of a SOFT syndrome patient diagnosed with a homozygous splicing variant, which could help to extend our understanding of the genotypic and phenotypic information of the disease. CASE PRESENTATION We reported a seven-year-old boy with SOFT syndrome. The patient presented symmetrical short stature and facial features, including prominent forehead, inverted triangular face, epicanthal fold, small teeth and enlarged ears. Laboratory tests displayed mild insulin resistance. Whole-exome sequencing (WES) led to the identification of a homozygous splicing variant (c.981+1G>A) in POC1A gene of the patient, which was inherited from his heterozygous parents confirmed by Sanger sequencing. Further transcriptional experiments of the splicing variant revealed aberrant percentage of exon 9 skipping transcripts. CONCLUSIONS This is the firstly reported case of a SOFT syndrome patient with a novel homozygous splicing variant and detailed delineation of the aberrant transcript in proband and carrier of the variant in Chinese. Our study enriched mutational spectrum of POC1A which could help in further genetic diagnosis and counselling of SOFT syndrome patients.
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Affiliation(s)
- Guoqiang Li
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Guoying Chang
- Department of Endocrine and Metabolism, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Chen Wang
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Tingting Yu
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Niu Li
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Xiaodong Huang
- Department of Endocrine and Metabolism, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Xiumin Wang
- Department of Endocrine and Metabolism, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Jian Wang
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China
| | - Jiwen Wang
- Department of Neurology, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China.
| | - Ruen Yao
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, People's Republic of China.
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Majore S, Agolini E, Micale L, Pascolini G, Zuppi P, Cocciadiferro D, Morlino S, Mattiuzzo M, Valiante M, Castori M, Novelli A, Grammatico P. Clinical presentation and molecular characterization of a novel patient with variant POC1A-related syndrome. Clin Genet 2021; 99:540-546. [PMID: 33372278 DOI: 10.1111/cge.13911] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 04/18/2020] [Revised: 12/10/2020] [Accepted: 12/24/2020] [Indexed: 12/14/2022]
Abstract
Biallelic pathogenic variants in POC1A result in SOFT (Short-stature, Onychodysplasia, Facial-dysmorphism, and hypoTrichosis) and variant POC1A-related (vPOC1A) syndromes. The latter, nowadays described in only two unrelated subjects, is associated with a restricted spectrum of variants falling in exon 10, which is naturally skipped in a specific POC1A mRNA. The synthesis of an amount of a POC1A isoform from this transcript in individuals with vPOC1A syndrome has been believed as the likely explanation for such a genotype-phenotype correlation. Here, we illustrate the clinical and molecular findings in a woman who resulted to be compound heterozygous for a recurrent frameshift variant in exon 10 and a novel variant in exon 9 of POC1A. Phenotypic characteristics of this woman included severe hyperinsulinemic dyslipidemia, acanthosis nigricans, moderate growth restriction, and dysmorphisms. These manifestations overlap the clinical features of the two previously published individuals with vPOC1A syndrome. RT-PCR analysis on peripheral blood and subsequent sequencing of the obtained amplicons demonstrated a variety of POC1A alternative transcripts that resulted to be expressed in the proband, in the healthy mother, and in controls. We illustrate the possible consequences of the two POC1A identified variants in an attempt to explain pleiotropy in vPOC1A syndrome.
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Affiliation(s)
- Silvia Majore
- Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
| | - Emanuele Agolini
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, Rome, Italy
| | - Lucia Micale
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Giulia Pascolini
- Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
| | - Paolo Zuppi
- Endocrinology Unit, San Camillo-Forlanini Hospital, Rome, Italy
| | - Dario Cocciadiferro
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, Rome, Italy
| | - Silvia Morlino
- Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
| | - Matteo Mattiuzzo
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, Rome, Italy
| | - Michele Valiante
- Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
| | - Marco Castori
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Antonio Novelli
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, Rome, Italy
| | - Paola Grammatico
- Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
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Saida K, Silva S, Solar B, Fujita A, Hamanaka K, Mitsuhashi S, Koshimizu E, Mizuguchi T, Miyatake S, Takata A, Miyake N, Matsumoto N. SOFT syndrome in a patient from Chile. Am J Med Genet A 2018; 179:338-340. [PMID: 30569574 DOI: 10.1002/ajmg.a.61015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 09/23/2018] [Revised: 11/15/2018] [Accepted: 11/20/2018] [Indexed: 11/10/2022]
Abstract
SOFT syndrome (MIM614813) is an extremely rare primordial dwarfism caused by biallelic mutations in the POC1A gene. It is characterized by prenatal short stature, onychodysplasia, facial dysmorphism, hypotrichosis, and variable skeletal abnormalities including hypoplastic pelvis and sacrum, small hands, and cone-shaped epiphyses, as well as delayed bone age. To the best of our knowledge, only eight POC1A mutations have been reported in humans to date. We report a 7-year-old Chilean girl with SOFT syndrome arising from a novel POC1A mutation c. 649C>T, p.Arg217Trp. Although her clinical features were largely compatible with SOFT syndrome, hand X-ray examinations at 3.5 and 6 years unexpectedly showed normal bone age. Automated bone age determination was performed using image analysis software, BoneXpert. This case highlights the importance of the accumulation of patients with POC1A mutations to further elucidate the detailed clinical features of SOFT syndrome.
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Affiliation(s)
- Ken Saida
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Sebastian Silva
- Servicio de Neurología Infantil, Hospital de Puerto Montt, Puerto Montt, Chile
| | - Benjamin Solar
- Servicio de Neurología Infantil, Hospital de Puerto Montt, Puerto Montt, Chile
| | - Atsushi Fujita
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Kohei Hamanaka
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Satomi Mitsuhashi
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Eriko Koshimizu
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Takeshi Mizuguchi
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Satoko Miyatake
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Atsushi Takata
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Noriko Miyake
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
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Abstract
Primordial dwarfism (PD) is a group of rare genetically heterogeneous disorders consisted of disorders with intrauterine growth retardation continued through the life. SOFT syndrome with characteristics of short stature, onychodysplasia, facial dysmorphism, and hypotrichosis has been presented as a subtype of PD. Only 20 cases of SOFT syndrome have been reported in world to date, but none of them were not in Iran. Our case was 6.5-year-old girl with a complaint of growth retardation including height of 97 cm (Z = −4.6 standard deviation [SD]) and weight of 14 kg (Z = −4 SD) referred to growth clinic. She had a prominent forehead, triangular face, short limbs, malformed nails, and crowded teeth and her psychomotor function was normal. Laboratory and karyotype tests were normal while she was homozygous for c.G491A mutation of POC1A gene thus SOFT syndrome diagnosis was confirmed for her and recombinant growth hormone therapy was discontinued.
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Affiliation(s)
- Neda Mostofizadeh
- Endocrine and Metabolism Research Center, Department of Pediatrics, Imam Hossein Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mahshid Gheidarloo
- Endocrine and Metabolism Research Center, Department of Pediatrics, Imam Hossein Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mahin Hashemipour
- Endocrine and Metabolism Research Center, Department of Pediatrics, Imam Hossein Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Elham Hashemi Dehkordi
- Child Growth and Development Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
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