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Elli FM, Mattinzoli D, Lucca C, Piu M, Maffini MA, Costanza J, Fontana L, Santaniello C, Forino C, Milani D, Bonati MT, Secco A, Gastaldi R, Alfieri C, Messa P, Miozzo M, Arosio M, Mantovani G. Novel Pathogenetic Variants in PTHLH and TRPS1 Genes Causing Syndromic Brachydactyly. J Bone Miner Res 2022; 37:465-474. [PMID: 34897794 PMCID: PMC9305952 DOI: 10.1002/jbmr.4490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 12/01/2021] [Accepted: 12/08/2021] [Indexed: 11/30/2022]
Abstract
Skeletal disorders, including both isolated and syndromic brachydactyly type E, derive from genetic defects affecting the fine tuning of the network of pathways involved in skeletogenesis and growth-plate development. Alterations of different genes of this network may result in overlapping phenotypes, as exemplified by disorders due to the impairment of the parathyroid hormone/parathyroid hormone-related protein pathway, and obtaining a correct diagnosis is sometimes challenging without a genetic confirmation. Five patients with Albright's hereditary osteodystrophy (AHO)-like skeletal malformations without a clear clinical diagnosis were analyzed by whole-exome sequencing (WES) and novel potentially pathogenic variants in parathyroid hormone like hormone (PTHLH) (BDE with short stature [BDE2]) and TRPS1 (tricho-rhino-phalangeal syndrome [TRPS]) were discovered. The pathogenic impact of these variants was confirmed by in vitro functional studies. This study expands the spectrum of genetic defects associated with BDE2 and TRPS and demonstrates the pathogenicity of TRPS1 missense variants located outside both the nuclear localization signal and the GATA ((A/T)GATA(A/G)-binding zinc-containing domain) and Ikaros-like binding domains. Unfortunately, we could not find distinctive phenotypic features that might have led to an earlier clinical diagnosis, further highlighting the high degree of overlap among skeletal syndromes associated with brachydactyly and AHO-like features, and the need for a close interdisciplinary workout in these rare patients. © 2021 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Francesca Marta Elli
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Deborah Mattinzoli
- Renal Research Laboratory, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Camilla Lucca
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Matteo Piu
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Maria A Maffini
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Jole Costanza
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, UOS Coordinamento Laboratori di Ricerca, Direzione Scientifica, Milan, Italy
| | - Laura Fontana
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, UOS Coordinamento Laboratori di Ricerca, Direzione Scientifica, Milan, Italy
| | - Carlo Santaniello
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, UOS Coordinamento Laboratori di Ricerca, Direzione Scientifica, Milan, Italy
| | | | - Donatella Milani
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Unità di Pediatria Alta Intensità di Cura, Milan, Italy
| | - Maria Teresa Bonati
- Clinic of Medical Genetics, IRCCS Istituto Auxologico Italiano, Milan, Italy
| | - Andrea Secco
- SC Pediatria e DEA Pediatrico, Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo, Alessandria, Italy
| | | | - Carlo Alfieri
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.,Dialysis and Renal Transplant Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Piergiorgio Messa
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.,Dialysis and Renal Transplant Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Monica Miozzo
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, UOS Coordinamento Laboratori di Ricerca, Direzione Scientifica, Milan, Italy
| | - Maura Arosio
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Giovanna Mantovani
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
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Reyes M, Silve C, Jüppner H. Shortened Fingers and Toes: GNAS Abnormalities are Not the Only Cause. Exp Clin Endocrinol Diabetes 2020; 128:681-686. [PMID: 31860119 PMCID: PMC7950720 DOI: 10.1055/a-1047-0334] [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] [Indexed: 10/25/2022]
Abstract
The PTH/PTHrP receptor (PTHR1) mediates the actions of parathyroid hormone (PTH) and PTH-related peptide (PTHrP) by coupling this G protein-coupled receptor (GPCR) to the alpha-subunit of the heterotrimeric stimulatory G protein (Gsα) and thereby to the formation of cAMP. In growth plates, PTHrP-dependent activation of the cAMP/PKA second messenger pathway prevents the premature differentiation of chondrocytes into hypertrophic cells resulting in delayed growth plate closure. Heterozygous mutations in GNAS, the gene encoding Gsα, lead to a reduction in cAMP levels in growth plate chondrocytes that is sufficient to cause shortening of metacarpals and/or -tarsals, i. e. typical skeletal aspects of Albright's Hereditary Osteodystrophy (AHO). However, heterozygous mutations in other genes, including those encoding PTHrP, PRKAR1A, PDE4D, and PDE3A, can lead to similar or even more pronounced acceleration of skeletal maturation that is particularly obvious in hands and feet, and reduces final adult height. Genetic mutations other than those resulting in Gsα haploinsufficiency thus reduce intracellular cAMP levels in growth plate chondrocytes to a similar extent and thereby accelerate skeletal maturation.
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Affiliation(s)
- Monica Reyes
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Caroline Silve
- INSERM équipe “Génomiques et épigénétique des tumeurs rares”, Institut Cochin, Paris, France
- Centre de Référence des Maladies rares du Calcium et du Phosphore and Filière de Santé Maladies Rares OSCAR, AP-HP, Paris, France
- Service de Biochimie et Génétique Moléculaires, Hôpital Cochin, AP- HP, Paris, France
| | - Harald Jüppner
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Pediatric Nephrology Unit, MassGeneral Hospital for Children Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Elli FM, de Sanctis L, Madeo B, Maffini MA, Bordogna P, Pirelli A, Arosio M, Mantovani G. 2q37 Deletions in Patients With an Albright Hereditary Osteodystrophy Phenotype and PTH Resistance. Front Endocrinol (Lausanne) 2019; 10:604. [PMID: 31555217 PMCID: PMC6727065 DOI: 10.3389/fendo.2019.00604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 08/19/2019] [Indexed: 12/12/2022] Open
Abstract
Pseudohypoparathyroidism (PHP) is a rare endocrine disorder derived from the defective activation of the cAMP pathway by the parathyroid hormone secondary to GNAS molecular defects. PHP subtypes are defined by the presence/absence of specific clinical/biochemical features. PHP1A is characterized by resistance to multiple hormones with features of Albright hereditary osteodystrophy (AHO), while pseudopseudohypoparathyroidism (PPHP) is characterized by AHO in the absence of PTH resistance. Small subsets of PHP and PPHP patients without known molecular defects have been re-diagnosed as being affected by the brachydactyly-mental retardation syndrome (BDMR), also known as the AHO-like syndrome. This study aimed to analyse 24 PHP1A and 51 PPHP patients without a molecular diagnosis for the presence of BDMR-associated 2q37 deletions to improve the differential diagnosis and to identify features that might help to avoid a misdiagnosis. Molecular investigations identified 4 deletions in 4 unrelated patients. The affected patients showed a combination of the most pathognomonic AHO features. Of note, 3 of the patients also displayed mild PTH resistance, and none of the patients developed ectopic ossifications. Our work confirmed the rarity of the misdiagnosis of BDMR in PHP patients through the identification of 4 patients bearing a 2q37 deletion in a cohort of 73 PHP patients (5.3%). Three patients with the deletion presented a PHP1A phenotype in the absence of any BDMR-specific findings. Further studies on larger case series are needed to elucidate the overlap between these clinical entities and to allow the early identification of patients.
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Affiliation(s)
- Francesca Marta Elli
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Luisa de Sanctis
- Department of Public Health and Pediatric Sciences, Regina Margherita Children's Hospital-AOU Città della Salute e della Scienza, University of Torino, Turin, Italy
| | - Bruno Madeo
- Unit of Endocrinology, Department of Medical Specialties, Ospedale Civile di Baggiovara, Azienda Ospedaliero-Universitaria di Modena, Modena, Italy
| | - Maria A. Maffini
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Paolo Bordogna
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Arianna Pirelli
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Maura Arosio
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Giovanna Mantovani
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
- *Correspondence: Giovanna Mantovani
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