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Juchnewitsch AG, Pomm K, Dutta A, Tamp E, Valkna A, Lillepea K, Mahyari E, Tjagur S, Belova G, Kübarsepp V, Castillo-Madeen H, Riera-Escamilla A, Põlluaas L, Nagirnaja L, Poolamets O, Vihljajev V, Sütt M, Versbraegen N, Papadimitriou S, McLachlan RI, Jarvi KA, Schlegel PN, Tennisberg S, Korrovits P, Vigh-Conrad K, O’Bryan MK, Aston KI, Lenaerts T, Conrad DF, Kasak L, Punab M, Laan M. Undiagnosed RASopathies in infertile men. Front Endocrinol (Lausanne) 2024; 15:1312357. [PMID: 38654924 PMCID: PMC11035881 DOI: 10.3389/fendo.2024.1312357] [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: 10/10/2023] [Accepted: 03/11/2024] [Indexed: 04/26/2024] Open
Abstract
RASopathies are syndromes caused by congenital defects in the Ras/mitogen-activated protein kinase (MAPK) pathway genes, with a population prevalence of 1 in 1,000. Patients are typically identified in childhood based on diverse characteristic features, including cryptorchidism (CR) in >50% of affected men. As CR predisposes to spermatogenic failure (SPGF; total sperm count per ejaculate 0-39 million), we hypothesized that men seeking infertility management include cases with undiagnosed RASopathies. Likely pathogenic or pathogenic (LP/P) variants in 22 RASopathy-linked genes were screened in 521 idiopathic SPGF patients (including 155 CR cases) and 323 normozoospermic controls using exome sequencing. All 844 men were recruited to the ESTonian ANDrology (ESTAND) cohort and underwent identical andrological phenotyping. RASopathy-specific variant interpretation guidelines were used for pathogenicity assessment. LP/P variants were identified in PTPN11 (two), SOS1 (three), SOS2 (one), LZTR1 (one), SPRED1 (one), NF1 (one), and MAP2K1 (one). The findings affected six of 155 cases with CR and SPGF, three of 366 men with SPGF only, and one (of 323) normozoospermic subfertile man. The subgroup "CR and SPGF" had over 13-fold enrichment of findings compared to controls (3.9% vs. 0.3%; Fisher's exact test, p = 5.5 × 10-3). All ESTAND subjects with LP/P variants in the Ras/MAPK pathway genes presented congenital genitourinary anomalies, skeletal and joint conditions, and other RASopathy-linked health concerns. Rare forms of malignancies (schwannomatosis and pancreatic and testicular cancer) were reported on four occasions. The Genetics of Male Infertility Initiative (GEMINI) cohort (1,416 SPGF cases and 317 fertile men) was used to validate the outcome. LP/P variants in PTPN11 (three), LZTR1 (three), and MRAS (one) were identified in six SPGF cases (including 4/31 GEMINI cases with CR) and one normozoospermic man. Undiagnosed RASopathies were detected in total for 17 ESTAND and GEMINI subjects, 15 SPGF patients (10 with CR), and two fertile men. Affected RASopathy genes showed high expression in spermatogenic and testicular somatic cells. In conclusion, congenital defects in the Ras/MAPK pathway genes represent a new congenital etiology of syndromic male infertility. Undiagnosed RASopathies were especially enriched among patients with a history of cryptorchidism. Given the relationship between RASopathies and other conditions, infertile men found to have this molecular diagnosis should be evaluated for known RASopathy-linked health concerns, including specific rare malignancies.
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Affiliation(s)
- Anna-Grete Juchnewitsch
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Kristjan Pomm
- Andrology Clinic, Tartu University Hospital, Tartu, Estonia
| | - Avirup Dutta
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Erik Tamp
- Centre of Pathology, East Tallinn Central Hospital, Tallinn, Estonia
| | - Anu Valkna
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Kristiina Lillepea
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Eisa Mahyari
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | | | - Galina Belova
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Viljo Kübarsepp
- Department of Surgery, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
- Department of Pediatric Surgery, Clinic of Surgery, Tartu University Hospital, Tartu, Estonia
| | - Helen Castillo-Madeen
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Antoni Riera-Escamilla
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Lisanna Põlluaas
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Liina Nagirnaja
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Olev Poolamets
- Andrology Clinic, Tartu University Hospital, Tartu, Estonia
| | | | - Mailis Sütt
- Andrology Clinic, Tartu University Hospital, Tartu, Estonia
| | - Nassim Versbraegen
- Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles-Vrije Universiteit Brussel, Brussels, Belgium
- Machine Learning Group, Université Libre de Bruxelles, Brussels, Belgium
| | - Sofia Papadimitriou
- Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles-Vrije Universiteit Brussel, Brussels, Belgium
- Machine Learning Group, Université Libre de Bruxelles, Brussels, Belgium
- Department of Biomolecular Medicine, Faculty of Medicine and Health Science, Ghent University, Ghent, Belgium
| | - Robert I. McLachlan
- Hudson Institute of Medical Research and the Department of Obstetrics and Gynecology, Monash University, Clayton, VIC, Australia
| | - Keith A. Jarvi
- Division of Urology, Department of Surgery, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada
| | - Peter N. Schlegel
- Department of Urology, Weill Cornell Medical College, New York, NY, United States
| | | | - Paul Korrovits
- Andrology Clinic, Tartu University Hospital, Tartu, Estonia
| | - Katinka Vigh-Conrad
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Moira K. O’Bryan
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, VIC, Australia
| | - Kenneth I. Aston
- Andrology and IVF Laboratory, Department of Surgery (Urology), University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Tom Lenaerts
- Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles-Vrije Universiteit Brussel, Brussels, Belgium
- Machine Learning Group, Université Libre de Bruxelles, Brussels, Belgium
- Artificial Intelligence Laboratory, Vrije Universiteit Brussel, Brussels, Belgium
| | - Donald F. Conrad
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
- Center for Embryonic Cell and Gene Therapy, Oregon Health and Science University, Beaverton, OR, United States
| | - Laura Kasak
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Margus Punab
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Andrology Clinic, Tartu University Hospital, Tartu, Estonia
- Department of Surgery, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
| | - Maris Laan
- Chair of Human Genetics, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
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Osterburg C, Dötsch V. Structural diversity of p63 and p73 isoforms. Cell Death Differ 2022; 29:921-937. [PMID: 35314772 PMCID: PMC9091270 DOI: 10.1038/s41418-022-00975-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 01/25/2023] Open
Abstract
Abstract
The p53 protein family is the most studied protein family of all. Sequence analysis and structure determination have revealed a high similarity of crucial domains between p53, p63 and p73. Functional studies, however, have shown a wide variety of different tasks in tumor suppression, quality control and development. Here we review the structure and organization of the individual domains of p63 and p73, the interaction of these domains in the context of full-length proteins and discuss the evolutionary origin of this protein family.
Facts
Distinct physiological roles/functions are performed by specific isoforms.
The non-divided transactivation domain of p63 has a constitutively high activity while the transactivation domains of p53/p73 are divided into two subdomains that are regulated by phosphorylation.
Mdm2 binds to all three family members but ubiquitinates only p53.
TAp63α forms an autoinhibited dimeric state while all other vertebrate p53 family isoforms are constitutively tetrameric.
The oligomerization domain of p63 and p73 contain an additional helix that is necessary for stabilizing the tetrameric states. During evolution this helix got lost independently in different phylogenetic branches, while the DNA binding domain became destabilized and the transactivation domain split into two subdomains.
Open questions
Is the autoinhibitory mechanism of mammalian TAp63α conserved in p53 proteins of invertebrates that have the same function of genomic quality control in germ cells?
What is the physiological function of the p63/p73 SAM domains?
Do the short isoforms of p63 and p73 have physiological functions?
What are the roles of the N-terminal elongated TAp63 isoforms, TA* and GTA?
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Prenatal diagnosis of ectrodactyly-ectodermal dysplasia clefting syndrome ‒ a case report with literature review. CASE REPORTS IN PERINATAL MEDICINE 2022. [DOI: 10.1515/crpm-2021-0076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Objectives
The ectrodactyly-ectodermal dysplasia clefting (EEC) syndrome is a rare genetic anomaly described as ectrodactyly (hands and feet), ectodermal dysplasia, and facial cleft with an incidence of around 1 in 90,000 in the population. This syndrome belongs to the TP63 gene’s mutation family. Ectrodactyly is described as the absence of the central toes or fingers or parts of these appendages. Ectodermal dysplasia usually includes changes in the skin, teeth, hair, nails, endocrine glands, nasolacrimal ducts, genitourinary system, conductive hearing loss.
Case presentation
This is a unique case of a 40-year-old second gravida, suspected of having a sporadic form of EEC syndrome. Routine transabdominal ultrasound at 14 weeks of gestation revealed malformation of the limbs. The two-dimensional and three-dimensional ultrasound at 16 weeks showed a fetus with ectrodactyly of right hand and foot and cleft palate presence. Diagnostic amniocentesis was performed at 17 weeks of gestation. A molecular genetics test using the Sanger sequencing method from amniotic fluid was performed by scanning TP63 gene sequences and revealed a heterozygous pathogenic variant in TP63. The patient decided on feticide.
Conclusions
The heredity of the syndrome is autosomal dominant with high variable expression. More than 300 clinical cases of this syndrome are described in the literature, including both sexes, but the actual etiology is unknown.
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Enhanced pro-apoptosis gene signature following the activation of TAp63α in oocytes upon γ irradiation. Cell Death Dis 2022; 13:204. [PMID: 35246516 PMCID: PMC8897389 DOI: 10.1038/s41419-022-04659-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 02/01/2022] [Accepted: 02/14/2022] [Indexed: 12/20/2022]
Abstract
Specialized surveillance mechanisms are essential to maintain the genetic integrity of germ cells, which are not only the source of all somatic cells but also of the germ cells of the next generation. DNA damage and chromosomal aberrations are, therefore, not only detrimental for the individual but affect the entire species. In oocytes, the surveillance of the structural integrity of the DNA is maintained by the p53 family member TAp63α. The TAp63α protein is highly expressed in a closed and inactive state and gets activated to the open conformation upon the detection of DNA damage, in particular DNA double-strand breaks. To understand the cellular response to DNA damage that leads to the TAp63α triggered oocyte death we have investigated the RNA transcriptome of oocytes following irradiation at different time points. The analysis shows enhanced expression of pro-apoptotic and typical p53 target genes such as CDKn1a or Mdm2, concomitant with the activation of TAp63α. While DNA repair genes are not upregulated, inflammation-related genes become transcribed when apoptosis is initiated by activation of STAT transcription factors. Furthermore, comparison with the transcriptional profile of the ΔNp63α isoform from other studies shows only a minimal overlap, suggesting distinct regulatory programs of different p63 isoforms.
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Mouse models in palate development and orofacial cleft research: Understanding the crucial role and regulation of epithelial integrity in facial and palate morphogenesis. Curr Top Dev Biol 2022; 148:13-50. [PMID: 35461563 PMCID: PMC9060390 DOI: 10.1016/bs.ctdb.2021.12.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cleft lip and cleft palate are common birth defects resulting from genetic and/or environmental perturbations of facial development in utero. Facial morphogenesis commences during early embryogenesis, with cranial neural crest cells interacting with the surface ectoderm to form initially partly separate facial primordia consisting of the medial and lateral nasal prominences, and paired maxillary and mandibular processes. As these facial primordia grow around the primitive oral cavity and merge toward the ventral midline, the surface ectoderm undergoes a critical differentiation step to form an outer layer of flattened and tightly connected periderm cells with a non-stick apical surface that prevents epithelial adhesion. Formation of the upper lip and palate requires spatiotemporally regulated inter-epithelial adhesions and subsequent dissolution of the intervening epithelial seam between the maxillary and medial/lateral nasal processes and between the palatal shelves. Proper regulation of epithelial integrity plays a paramount role during human facial development, as mutations in genes encoding epithelial adhesion molecules and their regulators have been associated with syndromic and non-syndromic orofacial clefts. In this chapter, we summarize mouse genetic studies that have been instrumental in unraveling the mechanisms regulating epithelial integrity and periderm differentiation during facial and palate development. Since proper epithelial integrity also plays crucial roles in wound healing and cancer, understanding the mechanisms regulating epithelial integrity during facial development have direct implications for improvement in clinical care of craniofacial patients.
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Serra G, Antona V, Giuffré M, Li Pomi F, Lo Scalzo L, Piro E, Schierz IAM, Corsello G. Novel missense mutation of the TP63 gene in a newborn with Hay-Wells/Ankyloblepharon-Ectodermal defects-Cleft lip/palate (AEC) syndrome: clinical report and follow-up. Ital J Pediatr 2021; 47:196. [PMID: 34583755 PMCID: PMC8479907 DOI: 10.1186/s13052-021-01152-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 09/10/2021] [Indexed: 11/10/2022] Open
Abstract
Introduction Ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome, also known as Hay-Wells syndrome, is a rare genetic syndrome with ectodermal dysplasia. About 100 patients have been reported to date. It is associated to a heterozygous mutation of the tumor protein p63 (TP63) gene, located on chromosome 3q28. Typical clinical manifestations include: filiform ankyloblepharon adnatum (congenital adherence of the eyelids), ectodermal abnormalities (sparse and frizzy hair, skin defects, nail alterations, dental changes and hypohidrosis), and cleft lip/palate. Diagnostic suspicion is based on clinical signs and confirmed by genetic testing. Patient’s presentation We hereby report on a female newborn with erythroderma, thin lamellar desquamations, extensive skin erosions, sparse and wiry hair, filiform ankyloblepharon adnatum, agenesis of the lachrymal puncta, cleft palate and nail dysplasia. Her phenotype was compatible with AEC syndrome. Then, based on the clinical suspicion, sequencing analysis of the TP63 gene was performed, and revealed a de novo novel missense mutation. Eyelids adherence and cleft palate underwent surgical correction, while skin erosions were treated with topical antibiotics/antifungals and emollient/re-epithelizing creams. A surgical reconstruction is presently planned for the agenesis of the lachrymal puncta. The infant currently is 17 months of age and is included in a multidisciplinary follow-up. At present shows growth impairment and mild developmental delay, and typical signs of ectodermal dysplasia with small areas of dermatitis lesions on the scalp, without further abnormalities. Conclusions Our report underlines the relevance of an early and careful clinical evaluation in neonates with ankyloblefaron, facial dysmorphism, and signs of ectodermal dysplasia. In these cases, the suspicion of AEC syndrome must be promptly raised, and sequencing analysis of TP63 early performed as well. An individualized, multidisciplinary and long-term follow-up should be guaranteed to affected subjects and their families, also to identify associated morbidities and prevent possible serious complications and adverse outcomes.
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Affiliation(s)
- Gregorio Serra
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy.
| | - Vincenzo Antona
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Mario Giuffré
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Federica Li Pomi
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Lucia Lo Scalzo
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Ettore Piro
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Ingrid Anne Mandy Schierz
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Giovanni Corsello
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "G. D'Alessandro", University of Palermo, Palermo, Italy
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Isoform-Specific Roles of Mutant p63 in Human Diseases. Cancers (Basel) 2021; 13:cancers13030536. [PMID: 33572532 PMCID: PMC7866788 DOI: 10.3390/cancers13030536] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/25/2021] [Accepted: 01/27/2021] [Indexed: 12/26/2022] Open
Abstract
Simple Summary The protein p63 belongs to the family of the p53 tumor suppressor. Mouse models have, however, shown that it is not a classical tumor suppressor but instead involved in developmental processes. Mutations in the p63 gene cause several developmental defects in human patients characterized by limb deformation, cleft lip/palate, and ectodermal dysplasia due to p63’s role as a master regulator of epidermal development. In addition, p63 plays a key role as a quality control factor in oocytes and p63 mutations can result either in compromised genetic quality control or premature cell death of all oocytes. Abstract The p63 gene encodes a master regulator of epidermal commitment, development, and differentiation. Heterozygous mutations in the DNA binding domain cause Ectrodactyly, Ectodermal Dysplasia, characterized by limb deformation, cleft lip/palate, and ectodermal dysplasia while mutations in in the C-terminal domain of the α-isoform cause Ankyloblepharon-Ectodermal defects-Cleft lip/palate (AEC) syndrome, a life-threatening disorder characterized by skin fragility, severe, long-lasting skin erosions, and cleft lip/palate. The molecular disease mechanisms of these syndromes have recently become elucidated and have enhanced our understanding of the role of p63 in epidermal development. Here we review the molecular cause and functional consequences of these p63-mutations for skin development and discuss the consequences of p63 mutations for female fertility.
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Gebel J, Tuppi M, Sänger N, Schumacher B, Dötsch V. DNA Damaged Induced Cell Death in Oocytes. Molecules 2020; 25:molecules25235714. [PMID: 33287328 PMCID: PMC7730327 DOI: 10.3390/molecules25235714] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/25/2020] [Accepted: 11/30/2020] [Indexed: 12/19/2022] Open
Abstract
The production of haploid gametes through meiosis is central to the principle of sexual reproduction. The genetic diversity is further enhanced by exchange of genetic material between homologous chromosomes by the crossover mechanism. This mechanism not only requires correct pairing of homologous chromosomes but also efficient repair of the induced DNA double-strand breaks. Oocytes have evolved a unique quality control system that eliminates cells if chromosomes do not correctly align or if DNA repair is not possible. Central to this monitoring system that is conserved from nematodes and fruit fly to humans is the p53 protein family, and in vertebrates in particular p63. In mammals, oocytes are stored for a long time in the prophase of meiosis I which, in humans, can last more than 50 years. During the entire time of this arrest phase, the DNA damage checkpoint remains active. The treatment of female cancer patients with DNA damaging irradiation or chemotherapeutics activates this checkpoint and results in elimination of the oocyte pool causing premature menopause and infertility. Here, we review the molecular mechanisms of this quality control system and discuss potential therapeutic intervention for the preservation of the oocyte pool during chemotherapy.
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Affiliation(s)
- Jakob Gebel
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt, Germany; (J.G.); (M.T.)
| | - Marcel Tuppi
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt, Germany; (J.G.); (M.T.)
| | - Nicole Sänger
- Department for Gynecological Endocrinology and Reproductive Medicine, University Hospital of Bonn, Venusberg-Campus 1, 53217 Bonn, Germany;
| | - Björn Schumacher
- Institute for Genome Stability in Aging and Disease, Cologne Cluster of Excellence in Cellular Stress Responses in Aging-Associated Diseases (CECAD) Research Center, and Center for Molecular Medicine, University of Cologne, Joseph-Stelzmann-Str. 26, 50931 Cologne, Germany;
| | - Volker Dötsch
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt, Germany; (J.G.); (M.T.)
- Correspondence: ; Tel.: +49-69-798-29631
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Vincenzi M, Mercurio FA, Leone M. Sam Domains in Multiple Diseases. Curr Med Chem 2020; 27:450-476. [PMID: 30306850 DOI: 10.2174/0929867325666181009114445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 07/26/2018] [Accepted: 08/27/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND The sterile alpha motif (Sam) domain is a small helical protein module, able to undergo homo- and hetero-oligomerization, as well as polymerization, thus forming different types of protein architectures. A few Sam domains are involved in pathological processes and consequently, they represent valuable targets for the development of new potential therapeutic routes. This study intends to collect state-of-the-art knowledge on the different modes by which Sam domains can favor disease onset and progression. METHODS This review was build up by searching throughout the literature, for: a) the structural properties of Sam domains, b) interactions mediated by a Sam module, c) presence of a Sam domain in proteins relevant for a specific disease. RESULTS Sam domains appear crucial in many diseases including cancer, renal disorders, cataracts. Often pathologies are linked to mutations directly positioned in the Sam domains that alter their stability and/or affect interactions that are crucial for proper protein functions. In only a few diseases, the Sam motif plays a kind of "side role" and cooperates to the pathological event by enhancing the action of a different protein domain. CONCLUSION Considering the many roles of the Sam domain into a significant variety of diseases, more efforts and novel drug discovery campaigns need to be engaged to find out small molecules and/or peptides targeting Sam domains. Such compounds may represent the pillars on which to build novel therapeutic strategies to cure different pathologies.
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Affiliation(s)
- Marian Vincenzi
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy
| | - Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
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Zheng J, Liu H, Zhan Y, Liu Y, Wong SW, Cai T, Feng H, Han D. Tooth defects of EEC and AEC syndrome caused by heterozygous TP63 mutations in three Chinese families and genotype-phenotype correlation analyses of TP63-related disorders. Mol Genet Genomic Med 2019; 7:e704. [PMID: 31050217 PMCID: PMC6565570 DOI: 10.1002/mgg3.704] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 03/14/2019] [Accepted: 04/08/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Ectrodactyly-Ectodermal dysplasia-Cleft lip/palate (EEC) syndrome and Ankyloblepharon-Ectodermal defects-Cleft lip/palate (AEC) syndrome belong to p63 syndromes, a group of rare disorders exhibiting a wide variety of clinical manifestations. TP63 mutations have been reported to be associated with both EEC and AEC. METHODS Analysis of whole exome sequencing (WES) from patients with EEC or AEC syndrome and Sanger sequencing from family members. RESULTS We confirmed that three Chinese pedigrees affected with EEC or AEC harboring a distinct TP63 mutation, and described novel clinical phenotypes of EEC and AEC, including the presence of cubitus valgus deformity and taurodontism, which were discordant to their classical disease features. We also analyzed the genotype-phenotype correlation based on our findings. CONCLUSION We reported that the cubitus valgus deformity in patients with EEC and severe taurodontism in a patient with AEC had not been mentioned previously. Our study expands the phenotypic spectrum of EEC and AEC syndrome.
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Affiliation(s)
- Jinglei Zheng
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Haochen Liu
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Yuan Zhan
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, The 3rd Dental Clinic, Peking University School and Hospital of Stomatology, Beijing, China
| | - Yang Liu
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Sing-Wai Wong
- Oral and Craniofacial Biomedicine Curriculum, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Tao Cai
- National Institute of Dental and Craniofacial Research, NIH, Bethesda, Maryland
| | - Hailan Feng
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Dong Han
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
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Kawai T, Hayashi R, Nakai H, Shimomura Y, Kurban M, Hamie L, Fujikawa H, Fujimoto A, Abe R. A heterozygous mutation in the SAM domain of p63 underlies a mild form of ectodermal dysplasia. J Dermatol Sci 2018. [PMID: 29526522 DOI: 10.1016/j.jdermsci.2018.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Toru Kawai
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Ryota Hayashi
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
| | - Hiroyuki Nakai
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Yutaka Shimomura
- Department of Dermatology, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Mazen Kurban
- Department of Dermatology, American University of Beirut Medical Center, Beirut, Lebanon; Department of Biochemistry and Molecular Genetics, American University of Beirut Medical Center, Beirut, Lebanon; Department of Dermatology, Columbia University Medical Center, New York, USA
| | - Lamiaa Hamie
- Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Hiroki Fujikawa
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Atsushi Fujimoto
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Riichiro Abe
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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12
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Cadieux-Dion M, Safina NP, Engleman K, Saunders C, Repnikova E, Raje N, Canty K, Farrow E, Miller N, Zellmer L, Thiffault I. Novel heterozygous pathogenic variants in CHUK in a patient with AEC-like phenotype, immune deficiencies and 1q21.1 microdeletion syndrome: a case report. BMC MEDICAL GENETICS 2018. [PMID: 29523099 PMCID: PMC5845372 DOI: 10.1186/s12881-018-0556-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND Ectodermal dysplasias (ED) are a group of diseases that affects the development or function of the teeth, hair, nails and exocrine and sebaceous glands. One type of ED, ankyloblepharon-ectodermal defects-cleft lip/palate syndrome (AEC or Hay-Wells syndrome), is an autosomal dominant disease characterized by the presence of skin erosions affecting the palms, soles and scalp. Other clinical manifestations include ankyloblepharon filiforme adnatum, cleft lip, cleft palate, craniofacial abnormalities and ectodermal defects such as sparse wiry hair, nail changes, dental changes, and subjective hypohydrosis. CASE PRESENTATION We describe a patient presenting clinical features reminiscent of AEC syndrome in addition to recurrent infections suggestive of immune deficiency. Genetic testing for TP63, IRF6 and RIPK4 was negative. Microarray analysis revealed a 2 MB deletion on chromosome 1 (1q21.1q21.2). Clinical exome sequencing uncovered compound heterozygous variants in CHUK; a maternally-inherited frameshift variant (c.1365del, p.Arg457Aspfs*6) and a de novo missense variant (c.1388C > A, p.Thr463Lys) on the paternal allele. CONCLUSIONS To our knowledge, this is the fourth family reported with CHUK-deficiency and the second patient with immune abnormalities. This is the first case of CHUK-deficiency with compound heterozygous pathogenic variants, including one variant that arose de novo. In comparison to cases found in the literature, this patient demonstrates a less severe phenotype than previously described.
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Affiliation(s)
- Maxime Cadieux-Dion
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA.
| | - Nicole P Safina
- Division of Clinical Genetics, Children's Mercy Hospital, Kansas City, MO, USA.,Department of Pediatrics, Children's Mercy Hospital, Kansas City, MO, USA.,University of Missouri Kansas City, School of Medicine, Kansas City, MO, USA
| | - Kendra Engleman
- Division of Clinical Genetics, Children's Mercy Hospital, Kansas City, MO, USA
| | - Carol Saunders
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA.,Department of Pathology and Laboratory Medicine, Children's Mercy Hospitals, Kansas City, MO, USA.,University of Missouri Kansas City, School of Medicine, Kansas City, MO, USA
| | - Elena Repnikova
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA.,Division of Clinical Genetics, Children's Mercy Hospital, Kansas City, MO, USA
| | - Nikita Raje
- Pediatric Allergy, Asthma and Immunology Clinic, Children's Mercy Hospitals, Kansas City, MO, USA
| | - Kristi Canty
- Dermatology Clinic, Children's Mercy Hospitals, Kansas City, MO, USA
| | - Emily Farrow
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA.,Department of Pediatrics, Children's Mercy Hospital, Kansas City, MO, USA
| | - Neil Miller
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA
| | - Lee Zellmer
- Department of Pathology and Laboratory Medicine, Children's Mercy Hospitals, Kansas City, MO, USA
| | - Isabelle Thiffault
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, MO, USA.,Division of Clinical Genetics, Children's Mercy Hospital, Kansas City, MO, USA.,Department of Pathology and Laboratory Medicine, Children's Mercy Hospitals, Kansas City, MO, USA
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13
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Protein aggregation of the p63 transcription factor underlies severe skin fragility in AEC syndrome. Proc Natl Acad Sci U S A 2018; 115:E906-E915. [PMID: 29339502 PMCID: PMC5798343 DOI: 10.1073/pnas.1713773115] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The p63 gene encodes a master regulator of epidermal development and function. Specific mutations in p63 are causative of a life-threatening disorder mainly characterized by severe skin erosions and cleft palate. Little is known about the mechanisms underlying disease pathology and possible treatments. Based on biochemical studies, genetic mouse models, and functional assays, we demonstrate that these mutations cause p63 protein misfolding and aggregation. Protein aggregation lead to reduced DNA binding and impaired transcriptional activity. Importantly, genetic modifications of p63 that abolish aggregation of the mutant proteins rescue its function, revealing that ankyloblepharon-ectodermal defects-cleft lip/palate syndrome is a protein aggregation disorder and opening avenues for therapeutic intervention. The p63 gene encodes a master regulator of epidermal commitment, development, and differentiation. Heterozygous mutations in the C-terminal domain of the p63 gene can cause ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome, a life-threatening disorder characterized by skin fragility and severe, long-lasting skin erosions. Despite deep knowledge of p63 functions, little is known about mechanisms underlying disease pathology and possible treatments. Here, we show that multiple AEC-associated p63 mutations, but not those causative of other diseases, lead to thermodynamic protein destabilization, misfolding, and aggregation, similar to the known p53 gain-of-function mutants found in cancer. AEC mutant proteins exhibit impaired DNA binding and transcriptional activity, leading to dominant negative effects due to coaggregation with wild-type p63 and p73. Importantly, p63 aggregation occurs also in a conditional knock-in mouse model for the disorder, in which the misfolded p63 mutant protein leads to severe epidermal defects. Variants of p63 that abolish aggregation of the mutant proteins are able to rescue p63’s transcriptional function in reporter assays as well as in a human fibroblast-to-keratinocyte conversion assay. Our studies reveal that AEC syndrome is a protein aggregation disorder and opens avenues for therapeutic intervention.
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14
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Wenger T, Li D, Harr MH, Tan WH, Pellegrino R, Stark Z, Hakonarson H, Bhoj EJ. Expanding the phenotypic spectrum of TP63
-related disorders including the first set of monozygotic twins. Am J Med Genet A 2017; 176:75-81. [DOI: 10.1002/ajmg.a.38516] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 09/13/2017] [Accepted: 09/26/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Tara Wenger
- Division of Craniofacial Medicine; Seattle Children's Hospital; Seattle Washington
| | - Dong Li
- Center for Applied Genomics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Margaret H. Harr
- Center for Applied Genomics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Wen-Hann Tan
- Division of Genetics and Genomics Boston Children's Hospital; Harvard Medical School; Boston Massachusetts
| | - Renata Pellegrino
- Center for Applied Genomics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Zornitza Stark
- Victorian Clinical Genetics Service; Parkville Victoria Australia
| | - Hakon Hakonarson
- Center for Applied Genomics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Elizabeth J. Bhoj
- Center for Applied Genomics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
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15
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Monti P, Ghiorzo P, Menichini P, Foggetti G, Queirolo P, Izzotti A, Fronza G. TP63 mutations are frequent in cutaneous melanoma, support UV etiology, but their role in melanomagenesis is unclear. Oncol Rep 2017; 38:1985-1994. [PMID: 28849221 PMCID: PMC5652947 DOI: 10.3892/or.2017.5903] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 07/12/2017] [Indexed: 12/18/2022] Open
Abstract
In contrast to TP53, cancer development is rarely associated with mutations in the TP63 and TP73 genes. Recently, next generation sequencing analysis revealed that TP63 mutations are frequent, specifically in cutaneous melanomas. Cutaneous melanoma represents 4% of skin cancers but it is responsible for 80% of skin cancer related deaths. In the present study, we first determined whether all three members of the P53 family of transcription factors were found mutated in cutaneous melanomas by retrieving all TP53, TP63 and TP73 mutations from cBioPortal (http://www.cbioportal.org/). TP53 and TP63 were frequently mutated [15.0% (91/605) and 14.7% (89/605), respectively], while TP73 [1.5% (9/605)] was more rarely mutated (p<0.0001). A UV-mutation fingerprint was recognized for TP63 and TP73 genes. Then, we tried to evaluate the potential role of TP63 mutations as drivers or passengers in the tumorigenic process. In the former case, the amino acid substitutions should cause significant functional consequences on the main biochemical activity of the P63 protein, namely transactivation. The predicted effects of specific amino acid substitutions by two bioinformatics tools were rather different. Using a yeast-based functional assay, the observed hotspot mutant R379CP63 protein exhibited a substantial residual activity compared to the wild-type (>70%). This result does not support a major role of the mutant P63 protein in melanomagenesis while it is still consistent with the TP63 gene being a recorder of UV exposure. The TP63 mutation spectrum from cutaneous melanomas, when compared with that observed at the germinal level in patients affected by P63-associated diseases [ectodermal dysplasia syndromes, (EDs)], revealed significant differences. The TP63 mutations were more frequent at CpGs sites (p<0.0001) in EDs and at PyPy sites (p<0.0001) in cutaneous melanomas. The two spectra differed significantly (p<0.0001). We conclude that TP63 mutations are frequent in cutaneous melanoma, support UV etiology, but their role in melanomagenesis is unclear.
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Affiliation(s)
- Paola Monti
- UOC Mutagenesis, Ospedale Policlinico San Martino, I-16132 Genova, Italy
| | - Paola Ghiorzo
- Department of Internal Medicine and Medical Specialties, University of Genova, I-16132 Genova, Italy
- Genetics of Rare Cancers Unit, Ospedale Policlinico San Martino, I-16132 Genova, Italy
| | - Paola Menichini
- UOC Mutagenesis, Ospedale Policlinico San Martino, I-16132 Genova, Italy
| | - Giorgia Foggetti
- UOC Mutagenesis, Ospedale Policlinico San Martino, I-16132 Genova, Italy
| | - Paola Queirolo
- Medical Oncology Unit, Ospedale Policlinico San Martino, I-16132 Genova, Italy
| | - Alberto Izzotti
- UOC Mutagenesis, Ospedale Policlinico San Martino, I-16132 Genova, Italy
- Department of Health Sciences, University of Genova, I-16132 Genova, Italy
| | - Gilberto Fronza
- UOC Mutagenesis, Ospedale Policlinico San Martino, I-16132 Genova, Italy
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16
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Busa T, Jeraiby M, Clémenson A, Manouvrier S, Granados V, Philip N, Touraine R. Confirmation that RIPK4
mutations cause not only Bartsocas-Papas syndrome but also CHAND syndrome. Am J Med Genet A 2017; 173:3114-3117. [DOI: 10.1002/ajmg.a.38475] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 08/03/2017] [Accepted: 08/21/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Tiffany Busa
- Unité de génétique clinique, APHM; CHU Timone-Enfants; Marseille France
| | - Mohammed Jeraiby
- Service de Génétique Clinique, Chromosomique et Moléculaire; CHU-Hôpital Nord; Saint Etienne France
| | - Alix Clémenson
- Service d'Anatomie et Cytologie Pathologiques; CHU-Hôpital Nord; Saint Etienne France
| | - Sylvie Manouvrier
- Service de Génétique médicale; Hôpital Jeanne de Flandre; CHRU de Lille; Lille France
| | - Viviana Granados
- Service de Génétique Clinique, Chromosomique et Moléculaire; CHU-Hôpital Nord; Saint Etienne France
| | - Nicole Philip
- Unité de génétique clinique, APHM; CHU Timone-Enfants; Marseille France
| | - Renaud Touraine
- Service de Génétique Clinique, Chromosomique et Moléculaire; CHU-Hôpital Nord; Saint Etienne France
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17
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Kehrloesser S, Osterburg C, Tuppi M, Schäfer B, Vousden KH, Dötsch V. Intrinsic aggregation propensity of the p63 and p73 TI domains correlates with p53R175H interaction and suggests further significance of aggregation events in the p53 family. Cell Death Differ 2016; 23:1952-1960. [PMID: 27447112 PMCID: PMC5136486 DOI: 10.1038/cdd.2016.75] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 05/19/2016] [Accepted: 06/24/2016] [Indexed: 12/20/2022] Open
Abstract
The high percentage of p53 missense mutations found in cancer has been attributed to mutant acquired oncogenic gain of functions. Different aspects of these tumour-promoting functions are caused by repression of the transcriptional activity of p53 family members p63 and p73. A subset of frequently occurring p53 mutations results in thermodynamic destabilisation of the DNA-binding domain (DBD) rendering this domain highly unstable. These conformational mutants (such as p53R175H) have been suggested to directly bind to p63 and p73 via a co-aggregation mechanism mediated by their DBDs. Although the DBDs of p63 and p73 are in fact not sufficient for the interaction as shown previously, we demonstrate here that the transactivation inhibitory (TI) domains within the α-isoform-specific C termini of p63 and p73 are essential for binding to p53R175H. Hence, the closed dimeric conformation of inactive TAp63α that renders the TI domain inaccessible prevents efficient interaction. We further show that binding to p53R175H correlates with an intrinsic aggregation propensity of the tetrameric α-isoforms conferred by an openly accessible TI domain again supporting interaction via a co-aggregation mechanism.
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Affiliation(s)
- Sebastian Kehrloesser
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University Frankfurt, Frankfurt/Main, Germany
| | - Christian Osterburg
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University Frankfurt, Frankfurt/Main, Germany
| | - Marcel Tuppi
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University Frankfurt, Frankfurt/Main, Germany
| | - Birgit Schäfer
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University Frankfurt, Frankfurt/Main, Germany
| | | | - Volker Dötsch
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University Frankfurt, Frankfurt/Main, Germany
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18
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Gonzalez F, Loidi L, Abalo-Lojo JM. Novel variant in the TP63 gene associated to ankyloblepharon-ectodermal dysplasia-cleft lip/palate (AEC) syndrome. Ophthalmic Genet 2016; 38:277-280. [PMID: 27485918 DOI: 10.1080/13816810.2016.1210649] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Ankyloblepharon-ectodermal dysplasia-cleft lip/palate (AEC) syndrome is a disorder resulting from anomalous embryonic development of ectodermal tissues. There is evidence that AEC syndrome is caused by mutations in the TP63 gene, which encodes the p63 protein. This is an important regulatory protein involved in epidermal proliferation and differentiation. MATERIALS AND METHODS Genome sequencing was performed in DNA from peripheral blood leukocytes of a newborn with AEC syndrome and her parents. Variants were searched in all coding exons and intron-exon boundaries of the TP63 gene. RESULTS A heterozygous missense variant (NM_003722.4:c.1063G>C (p.Asp355His) was found in the newborn patient. No variants were found in either of the parents. CONCLUSIONS We identified a previously unreported variant in TP63 gene which seems to be involved in the somatic malformations found in the AEC syndrome. The absence of this variant in both parents suggests that the variant appeared de novo.
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Affiliation(s)
- Francisco Gonzalez
- a Department of Surgery and CIMUS , University of Santiago de Compostela , Santiago de Compostela , Spain.,b Service of Ophthalmology and IDIS , Complejo Hospitalario Universitario de Santiago de Compostela , Santiago de Compostela , Spain
| | - Lourdes Loidi
- c Fundación Publica Galega de Medicina Xenomica, SERGAS , Santiago de Compostela , Spain
| | - Jose M Abalo-Lojo
- b Service of Ophthalmology and IDIS , Complejo Hospitalario Universitario de Santiago de Compostela , Santiago de Compostela , Spain
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19
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Coutandin D, Osterburg C, Srivastav RK, Sumyk M, Kehrloesser S, Gebel J, Tuppi M, Hannewald J, Schäfer B, Salah E, Mathea S, Müller-Kuller U, Doutch J, Grez M, Knapp S, Dötsch V. Quality control in oocytes by p63 is based on a spring-loaded activation mechanism on the molecular and cellular level. eLife 2016; 5. [PMID: 27021569 PMCID: PMC4876613 DOI: 10.7554/elife.13909] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 03/28/2016] [Indexed: 01/07/2023] Open
Abstract
Mammalian oocytes are arrested in the dictyate stage of meiotic prophase I for long
periods of time, during which the high concentration of the p53 family member TAp63α
sensitizes them to DNA damage-induced apoptosis. TAp63α is kept in an inactive and
exclusively dimeric state but undergoes rapid phosphorylation-induced tetramerization
and concomitant activation upon detection of DNA damage. Here we show that the TAp63α
dimer is a kinetically trapped state. Activation follows a spring-loaded mechanism
not requiring further translation of other cellular factors in oocytes and is
associated with unfolding of the inhibitory structure that blocks the tetramerization
interface. Using a combination of biophysical methods as well as cell and ovary
culture experiments we explain how TAp63α is kept inactive in the absence of DNA
damage but causes rapid oocyte elimination in response to a few DNA double strand
breaks thereby acting as the key quality control factor in maternal reproduction. DOI:http://dx.doi.org/10.7554/eLife.13909.001 The irradiation and chemotherapy drugs that are used to destroy cancer cells also
damage healthy cells. Germ cells – from which egg cells and sperm cells develop – are
particularly vulnerable as they contain sensitive quality control mechanisms that
kill any cell that contain damaged DNA. Consequently, after surviving cancer many
patients are confronted with infertility. A protein called p63, which is closely related to another protein that suppresses the
formation of tumors, plays an essential role in detecting and responding to DNA
damage. In immature egg cells (also known as oocytes), p63 mostly exists in an
inactive form. The protein then switches to an active form when DNA damage is
detected to trigger the process of cell self-destruction. Now, Coutandin, Osterburg et al. have performed a range of biochemical, biophysical
and cell culture experiments to study how p63 is kept in its inactive form in the
oocytes of mice. The experiments showed that in the inactive form, the two ends of
the protein form a sheet that closes a key site on the protein and prevents it from
changing into its active form. However, this closed form can be thought of as being
like a spring-loaded trap – it doesn’t take much energy to spring the trap and open
the protein into its active form. Once this change has occurred, it is
irreversible. Coutandin, Osterburg et al. also found that the oocytes of mice already contain all
the proteins necessary to activate p63. This means that once the switch to the active
form is triggered there is no delay waiting for other proteins to be made, which
makes oocytes extremely sensitive to DNA damage. Further work is now needed to
investigate the exact molecular mechanisms behind the activation of p63. DOI:http://dx.doi.org/10.7554/eLife.13909.002
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Affiliation(s)
- Daniel Coutandin
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Christian Osterburg
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Ratnesh Kumar Srivastav
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Manuela Sumyk
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Sebastian Kehrloesser
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Jakob Gebel
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Marcel Tuppi
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Jens Hannewald
- MS-DTB-C Protein Purification, Merck KGaA, Darmstadt, Germany
| | - Birgit Schäfer
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
| | - Eidarus Salah
- Nuffield Department of Medicine, Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
| | - Sebastian Mathea
- Nuffield Department of Medicine, Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
| | | | - James Doutch
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot, United Kingdom
| | | | - Stefan Knapp
- Nuffield Department of Medicine, Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom.,Institute for Pharmaceutical Chemistry, Goethe University, Frankfurt, Germany.,Buchmann Institute for Molecular Life Science, Goethe University, Frankfurt, Germany
| | - Volker Dötsch
- Institute of Biophysical Chemistry, Goethe University, Frankfurt, Germany.,Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany.,Cluster of Excellence Macromolecular Complexes, Goethe University, Frankfurt, Germany
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20
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Rubinstein TJ, Weber AC, Traboulsi EI. Molecular biology and genetics of embryonic eyelid development. Ophthalmic Genet 2016; 37:252-9. [PMID: 26863902 DOI: 10.3109/13816810.2015.1071409] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The embryology of the eyelid is a complex process that includes interactions between the surface ectoderm and mesenchymal tissues. In the mouse and human, the eyelids form and fuse before birth; they open prenatally in the human and postnatally in the mouse. In the mouse, cell migration is stimulated by different growth factors such as FGF10, TGF-α, Activin B, and HB-EGF. These growth factors modulate downstream BMP4 signaling, the ERK cascade, and JNK/c-JUN. Several mechanisms, such as the Wnt/β-catenin signaling pathway, may inhibit and regulate eyelid fusion. Eyelid opening, on the other hand, is driven by the BMP/Smad signaling system. Several human genetic disorders result from dysregulation of the above molecular pathways.
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Affiliation(s)
| | - Adam C Weber
- a Cleveland Clinic Cole Eye Institute , Cleveland , Ohio , USA
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21
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Amino-terminal residues of ΔNp63, mutated in ectodermal dysplasia, are required for its transcriptional activity. Biochem Biophys Res Commun 2015; 467:434-40. [PMID: 26408908 DOI: 10.1016/j.bbrc.2015.09.111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 09/21/2015] [Indexed: 12/13/2022]
Abstract
p63, a member of the p53 family, is a crucial transcription factor for epithelial development and skin homeostasis. Heterozygous mutations in TP63 gene have been associated with human ectodermal dysplasia disorders. Most of these TP63 mutations are missense mutations causing amino acidic substitutions at p63 DNA binding or SAM domains that reduce or abolish the transcriptional activity of mutants p63. A significant number of mutants, however, resides in part of the p63 protein that apparently do not affect DNA binding and/or transcriptional activity, such as the N-terminal domain. Here, we characterize five p63 mutations at the 5' end of TP63 gene aiming to understand the pathogenesis of the diseases and to uncover the role of ΔNp63α N-terminus residues in determining its transactivation potential.
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22
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Differentially Expressed Genes in EEC and LMS Syndromes. PLoS One 2015; 10:e0129432. [PMID: 26075610 PMCID: PMC4468125 DOI: 10.1371/journal.pone.0129432] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 05/09/2015] [Indexed: 11/19/2022] Open
Abstract
Objectives Ectrodactyly ectodermal dysplasia cleft lip/palate (EEC) syndrome and limb-mammary syndrome (LMS) share a similar phenotype and the same pathogenic gene, which complicates the ability to distinguish between these diagnoses. The current study aims to identify a potential and practical clinical biomarker to distinguish EEC from LMS. Methods Two EEC pedigrees and one LMS pedigree that have been previously reported were reanalyzed. After confirmation of the causative mutations for these new patients, whole-genome expression microarray analysis was performed to assess the molecular genetic changes in these families. Results Five new patients with classic symptoms were reported, and these individuals exhibited the same mutation as their relatives (c.812 G>C; c.611G>A; and c.680G>A). According to the whole genome expression results, the EEC patients exhibited different gene expression characteristics compared with the LMS patients. More than 5,000 genes were differentially expressed (changes >2 or <0.5-fold) among the EEC patients, LMS patients and healthy individuals. The top three altered pathways have been implicated in apoptosis, the hematopoietic cell lineage and the Toll-like receptor signaling pathway. Conclusion Our results provide additional clinical and molecular information regarding EEC and LMS and suggest that peripheral blood cytokines may represent a promising clinical biomarker for the diagnosis of these syndromes.
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Kouwenhoven EN, van Bokhoven H, Zhou H. Gene regulatory mechanisms orchestrated by p63 in epithelial development and related disorders. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1849:590-600. [PMID: 25797018 DOI: 10.1016/j.bbagrm.2015.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 03/09/2015] [Accepted: 03/12/2015] [Indexed: 01/30/2023]
Abstract
The transcription factor p63 belongs to the p53 family and is a key regulator in epithelial commitment and development. Mutations in p63 give rise to several epithelial related disorders with defects in skin, limb and orofacial structures. Since the discovery of p63, efforts have been made to identify its target genes using individual gene approaches and to understand p63 function in normal epithelial development and related diseases. Recent genome-wide approaches have identified tens of thousands of potential p63-regulated target genes and regulatory elements, and reshaped the concept of gene regulation orchestrated by p63. These data also provide insights into p63-related disease mechanisms. In this review, we discuss the regulatory role of p63 in normal and diseased epithelial development in light of these novel findings. We also propose future perspectives for dissecting the molecular mechanism of p63-mediated epithelial development and related disorders as well as for potential therapeutic strategies.
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Affiliation(s)
- Evelyn N Kouwenhoven
- Radboud University, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands.
| | - Hans van Bokhoven
- Radboud university medical center, Department of Human Genetics, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands.
| | - Huiqing Zhou
- Radboud University, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands; Radboud university medical center, Department of Human Genetics, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands.
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Epidermal cell junctions and their regulation by p63 in health and disease. Cell Tissue Res 2015; 360:513-28. [PMID: 25645146 DOI: 10.1007/s00441-014-2108-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 12/17/2014] [Indexed: 12/17/2022]
Abstract
As the outermost tissue of the body, the epidermis is the first physical barrier for any pressure, stress or trauma. Several specialized cell-matrix and cell-cell adhesion structures, together with an intracellular network of dedicated intermediate filaments, are required to confer critical resilience to mechanical stress. The transcription factor p63 is a master regulator of gene expression in the epidermis and in other stratified epithelia. It has been extensively demonstrated that p63 positively controls a large number of tissue-specific genes, including those encoding a large fraction of tissue-restricted cell adhesion molecules. Consistent with p63 functions in cell adhesion and in epidermal differentiation, heterozygous mutations clustered mainly in the p63 C-terminus are causative of AEC syndrome, an autosomal dominant disorder characterized by cleft palate, ankyloblepharon and ectodermal dysplasia associated with severe skin erosions, bleeding and infections. The molecular basis of skin erosions in AEC patients is not fully understood, although defects in desmosomes and in other cell junctions are likely to be involved. Here, we provide an extensive review of the different epidermal cell junctions that cooperate to withstand mechanical stress and on the mechanisms by which p63 regulates gene expression of their components in healthy skin and in AEC syndrome. Collectively, advancement in understanding the molecular mechanisms by which epidermal cell junctions precisely exert their functions and how p63 orchestrates their coordinated expression, will ultimately lead to insight into developing future strategies for the treatment of AEC syndrome and more in generally for diseases that share an overlapping phenotype.
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Mollo MR, Antonini D, Mitchell K, Fortugno P, Costanzo A, Dixon J, Brancati F, Missero C. p63-dependent and independent mechanisms of nectin-1 and nectin-4 regulation in the epidermis. Exp Dermatol 2015; 24:114-9. [PMID: 25387952 PMCID: PMC4329386 DOI: 10.1111/exd.12593] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/06/2014] [Indexed: 02/06/2023]
Abstract
Nectins are immunoglobulin-like cell adhesion molecules mainly localized in adherens junctions. The transcription factor p63 is a master regulator of gene expression in stratified epithelia and controls several molecular processes. As mutations in the Pvrl1 and Pvrl4 genes encoding for nectins cause genetic disorders with phenotypes similar to p63-related syndromes, we investigated whether these proteins might be under p63 transcriptional control. Here, we show that in p63-null skin, Pvrl1 gene expression is strongly reduced, whereas Pvrl4 expression is unaffected. In human and mouse primary keratinocytes p63 depletion leads to a specific downregulation of the Pvrl1 gene. Consistent with a direct regulation, chromatin immunoprecipitation experiments (ChIP) indicate that p63 binds to two conserved intronic Pvrl1 enhancer regions. Ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome is a rare autosomal dominant disorder, caused by mutations in p63 gene, mainly characterized by skin fragility. To test whether nectins may be affected in AEC syndrome, their expression was measured in keratinocytes obtained from patients with AEC or from a conditional mouse model for AEC syndrome. Pvrl1 expression was reduced in AEC keratinocytes, consistent with impaired p63 function. Surprisingly, Pvrl4 expression was similarly affected, in parallel with decreased expression of the transcription factor Irf6. Consistent with the well-characterized role of Irf6 in keratinocyte differentiation and its strong downregulation in AEC syndrome, Irf6 depletion caused reduced expression of Pvrl4 in wild-type keratinocytes. Taken together, our results indicate that Pvrl1 is a bona fide target gene of the transcription factor p63, whereas Pvrl4 regulation is linked to epidermal differentiation and is under Irf6 control.
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Affiliation(s)
- Maria Rosaria Mollo
- CEINGE Biotecnologie AvanzateNapoli, Italy
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico IINapoli, Italy
| | | | - Karen Mitchell
- Faculty of Medical and Human Sciences, Manchester Academic Health Sciences Centre, University of ManchesterManchester, UK
| | - Paola Fortugno
- Dermatology Unit, Bambino Gesù Children's Hospital, IRCCSRome, Italy
| | - Antonio Costanzo
- Dermatology Unit, Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of RomeRome, Italy
| | - Jill Dixon
- Faculty of Medical and Human Sciences, Manchester Academic Health Sciences Centre, University of ManchesterManchester, UK
| | - Francesco Brancati
- Department of Biomedical Sciences, Aging Research Center, Gabriele d'Annunzio UniversityChieti, Italy
- Medical Genetics Unit, Policlinico Tor Vergata University HospitalRome, Italy
| | - Caterina Missero
- CEINGE Biotecnologie AvanzateNapoli, Italy
- Department of Biology, University of Naples Federico IINapoli, Italy
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Eisenkraft A, Pode-Shakked B, Goldstein N, Shpirer Z, van Bokhoven H, Anikster Y. Clinical Variability in a Family with an Ectodermal Dysplasia Syndrome and a Nonsense Mutation in the TP63 Gene. Fetal Pediatr Pathol 2015; 34:400-6. [PMID: 26470833 DOI: 10.3109/15513815.2015.1095261] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Mutations in the TP63 gene have been associated with a variety of ectodermal dysplasia syndromes, among which the clinically overlapping Ankyloblepharon-Ectodermal defects-Cleft lip/palate (AEC) and the Rapp-Hodgkin syndromes. We report a multiplex nonconsanguineous family of Ashkenazi-Jewish descent, in which the index patient presented with a persistent scalp skin lesion, dystrophic nails and light thin hair. Further evaluation revealed over 10 affected individuals in the kindred, over four generations, exhibiting varying degrees of ectodermal involvement. Analysis of the TP63 gene from four of the patients and from two healthy individuals of the same family was performed. Gene sequencing of the patients revealed a nonsense mutation leading to a premature termination codon (PTC) (p.Gln16X). The same mutation was found in all tested affected individuals in the family, but gave rise to marked phenotypic variability with minor clinical manifestations in some individuals, underscoring the clinical heterogeneity associated with the recently described PTC-causing mutations.
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Affiliation(s)
- Arik Eisenkraft
- a Department of Pediatrics, Edmond and Lily Safra Children's Hospital , Sheba Medical Center , Tel-Hashomer , Israel.,b The Institute for Research in Military Medicine, Faculty of Medicine , The Hebrew University of Jerusalem , Israel , and IDF Medical Corps
| | - Ben Pode-Shakked
- a Department of Pediatrics, Edmond and Lily Safra Children's Hospital , Sheba Medical Center , Tel-Hashomer , Israel.,c Sackler Faculty of Medicine, Tel-Aviv University , Tel-Aviv , Israel.,d The Dr. Pinchas Borenstein Talpiot Medical Leadership Program , Sheba Medical Center , Tel-Hashomer , Israel
| | - Nurit Goldstein
- e Metabolic Disease Unit, Edmond and Lily Safra Children's Hospital , Sheba Medical Center , Tel-Hashomer , Israel
| | - Zvi Shpirer
- a Department of Pediatrics, Edmond and Lily Safra Children's Hospital , Sheba Medical Center , Tel-Hashomer , Israel.,c Sackler Faculty of Medicine, Tel-Aviv University , Tel-Aviv , Israel
| | - Hans van Bokhoven
- f Department of Human Genetics , Radboud University Medical Center , Nijmegen , The Netherlands
| | - Yair Anikster
- c Sackler Faculty of Medicine, Tel-Aviv University , Tel-Aviv , Israel.,e Metabolic Disease Unit, Edmond and Lily Safra Children's Hospital , Sheba Medical Center , Tel-Hashomer , Israel
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Suzuki D, Sahu R, Leu NA, Senoo M. The carboxy-terminus of p63 links cell cycle control and the proliferative potential of epidermal progenitor cells. Development 2014; 142:282-90. [PMID: 25503409 DOI: 10.1242/dev.118307] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The transcription factor p63 (Trp63) plays a key role in homeostasis and regeneration of the skin. The p63 gene is transcribed from dual promoters, generating TAp63 isoforms with growth suppressive functions and dominant-negative ΔNp63 isoforms with opposing properties. p63 also encodes multiple carboxy (C)-terminal variants. Although mutations of C-terminal variants have been linked to the pathogenesis of p63-associated ectodermal disorders, the physiological role of the p63 C-terminus is poorly understood. We report here that deletion of the p63 C-terminus in mice leads to ectodermal malformation and hypoplasia, accompanied by a reduced proliferative capacity of epidermal progenitor cells. Notably, unlike the p63-null condition, we find that p63 C-terminus deficiency promotes expression of the cyclin-dependent kinase inhibitor p21(Waf1/Cip1) (Cdkn1a), a factor associated with reduced proliferative capacity of both hematopoietic and neuronal stem cells. These data suggest that the p63 C-terminus plays a key role in the cell cycle progression required to maintain the proliferative potential of stem cells of many different lineages. Mechanistically, we show that loss of Cα, the predominant C-terminal p63 variant in epithelia, promotes the transcriptional activity of TAp63 and also impairs the dominant-negative activity of ΔNp63, thereby controlling p21(Waf1/Cip1) expression. We propose that the p63 C-terminus links cell cycle control and the proliferative potential of epidermal progenitor cells via mechanisms that equilibrate TAp63 and ΔNp63 isoform function.
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Affiliation(s)
- Daisuke Suzuki
- Department of Animal Biology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Raju Sahu
- Department of Animal Biology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - N Adrian Leu
- Department of Animal Biology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA
| | - Makoto Senoo
- Department of Animal Biology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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28
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Goldsmith T, Eytan O, Magal L, Solomon M, Israeli S, Warshauer E, Grafi-Cohen M, Aberdam D, van Bokhoven H, Zhou H, Sarig O, Sprecher E, Nousbeck J. A mutation in TP63 causing a mild ectodermal dysplasia phenotype. J Invest Dermatol 2014; 134:2277-2280. [PMID: 24675753 DOI: 10.1038/jid.2014.159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tomer Goldsmith
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Ori Eytan
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel; Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Lee Magal
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Michal Solomon
- Department of Dermatology, Chaim Sheba Medical Center, Tel Hashomer, Israel
| | - Shirli Israeli
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Emily Warshauer
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Meital Grafi-Cohen
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Daniel Aberdam
- INSERM U976, Paris, France; University of Paris Diderot, Paris, France
| | - Hans van Bokhoven
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Huiqing Zhou
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands; Department of Molecular Developmental Biology, Radboud University, Radboud, The Netherlands
| | - Ofer Sarig
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Eli Sprecher
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel; Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Janna Nousbeck
- Department of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
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29
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Koch PJ, Dinella J, Fete M, Siegfried EC, Koster MI. Modeling AEC-New approaches to study rare genetic disorders. Am J Med Genet A 2014; 164A:2443-54. [PMID: 24665072 DOI: 10.1002/ajmg.a.36455] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 01/03/2014] [Indexed: 11/06/2022]
Abstract
Ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome is a rare monogenetic disorder that is characterized by severe abnormalities in ectoderm-derived tissues, such as skin and its appendages. A major cause of morbidity among affected infants is severe and chronic skin erosions. Currently, supportive care is the only available treatment option for AEC patients. Mutations in TP63, a gene that encodes key regulators of epidermal development, are the genetic cause of AEC. However, it is currently not clear how mutations in TP63 lead to the various defects seen in the patients' skin. In this review, we will discuss current knowledge of the AEC disease mechanism obtained by studying patient tissue and genetically engineered mouse models designed to mimic aspects of the disorder. We will then focus on new approaches to model AEC, including the use of patient cells and stem cell technology to replicate the disease in a human tissue culture model. The latter approach will advance our understanding of the disease and will allow for the development of new in vitro systems to identify drugs for the treatment of skin erosions in AEC patients. Further, the use of stem cell technology, in particular induced pluripotent stem cells (iPSC), will enable researchers to develop new therapeutic approaches to treat the disease using the patient's own cells (autologous keratinocyte transplantation) after correction of the disease-causing mutations.
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Affiliation(s)
- Peter J Koch
- Department of Dermatology, University of Colorado School of Medicine, Aurora, Colorado; Department of Cell and Developmental Biology, University of Colorado School of Medicine, Aurora, Colorado; Charles C. Gates Center for Regenerative Medicine and Stem Cell Biology, University of Colorado School of Medicine, Aurora, Colorado; Graduate Program in Cell Biology, Stem Cells and Development, University of Colorado School of Medicine, Aurora, Colorado
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30
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Vera-Carbonell A, Moya-Quiles MR, Ballesta-Martínez M, López-González V, Bafallíu JA, Guillén-Navarro E, López-Expósito I. Rapp–Hodgkin syndrome and SHFM1 patients: Delineating the p63–Dlx5/Dlx6 pathway. Gene 2012; 497:292-7. [DOI: 10.1016/j.gene.2012.01.088] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 01/27/2012] [Accepted: 01/29/2012] [Indexed: 11/29/2022]
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31
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Ferone G, Thomason HA, Antonini D, De Rosa L, Hu B, Gemei M, Zhou H, Ambrosio R, Rice DP, Acampora D, van Bokhoven H, Del Vecchio L, Koster MI, Tadini G, Spencer-Dene B, Dixon M, Dixon J, Missero C. Mutant p63 causes defective expansion of ectodermal progenitor cells and impaired FGF signalling in AEC syndrome. EMBO Mol Med 2012; 4:192-205. [PMID: 22247000 PMCID: PMC3376849 DOI: 10.1002/emmm.201100199] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 12/07/2011] [Accepted: 12/08/2011] [Indexed: 11/11/2022] Open
Abstract
Ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome, which is characterized by cleft palate and severe defects of the skin, is an autosomal dominant disorder caused by mutations in the gene encoding transcription factor p63. Here, we report the generation of a knock-in mouse model for AEC syndrome (p63(+/L514F) ) that recapitulates the human disorder. The AEC mutation exerts a selective dominant-negative function on wild-type p63 by affecting progenitor cell expansion during ectodermal development leading to a defective epidermal stem cell compartment. These phenotypes are associated with impairment of fibroblast growth factor (FGF) signalling resulting from reduced expression of Fgfr2 and Fgfr3, direct p63 target genes. In parallel, a defective stem cell compartment is observed in humans affected by AEC syndrome and in Fgfr2b(-/-) mice. Restoring Fgfr2b expression in p63(+/L514F) epithelial cells by treatment with FGF7 reactivates downstream mitogen-activated protein kinase signalling and cell proliferation. These findings establish a functional link between FGF signalling and p63 in the expansion of epithelial progenitor cells and provide mechanistic insights into the pathogenesis of AEC syndrome.
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Serra V, Castori M, Paradisi M, Bui L, Melino G, Terrinoni A. Functional characterization of a novel TP63 mutation in a family with overlapping features of Rapp-Hodgkin/AEC/ADULT syndromes. Am J Med Genet A 2011; 155A:3104-9. [PMID: 22069181 PMCID: PMC3306552 DOI: 10.1002/ajmg.a.34335] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 09/05/2011] [Indexed: 11/17/2022]
Abstract
Heterozygous mutations in TP63 cause a wide spectrum of autosomal dominant developmental disorders variably affecting skin, limbs, and face. TP63 encodes p63, a protein expressed in two main isoforms (Tap63 and ΔNp63) with critical roles in both cell differentiation and development. Some analyses suggest a relationship of the mutation site to the observed clinical picture, although this link is inconsistent. This suggests an appreciable phenotypic continuity within the TP63-related disorders. We report a 3-month-old boy ascertained for congenital scalp erosion and mild features of ectodermal dysplasia. His mother showed full-blown characteristics of Rapp-Hodgkin syndrome plus intense abdominal and popliteal freckling. Molecular investigation identified the novel TP63 mutation c.1697delG. We used a luciferase reporter assay to compare the effects on the p63 transactivation (TA) activity of c.1697delG with that of the p.Arg280Cys and p.Gln634X mutations, associated with ectrodactyly-ectodermal dysplasia-cleft lip/palate syndrome and isolated split hand/foot malformation, respectively. These results demonstrated complex behavior of c.1697delG in the TA of genes involved in epidermal differentiation and development and shed further light in the physiopathology of TP63-related disorders. © 2011 Wiley Periodicals, Inc.
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Affiliation(s)
- Valeria Serra
- IDI-IRCCS Biochemistry Laboratory, c/o Department of Experimental Medicine, University of Tor Vergata, Rome, Italy
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33
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Abstract
The transcription factor p63 is expressed as at least six different isoforms, of which two have been assigned critical biological roles within ectodermal development and skin stem cell biology on the one hand and supervision of the genetic stability of oocytes on the other hand. These two isoforms contain a C-terminal inhibitory domain that negatively regulates their transcriptional activity. This inhibitory domain contains two individual components: one that uses an internal binding mechanism to interact with and mask the transactivation domain and one that is based on sumoylation. We have carried out an extensive alanine scanning study to identify critical regions within the inhibitory domain. These experiments show that a stretch of ∼13 amino acids is crucial for the binding function. Further, investigation of transcriptional activity and the intracellular level of mutants that cannot be sumoylated suggests that sumoylation reduces the concentration of p63. We therefore propose that the inhibitory function of the C-terminal domain is in part due to direct inhibition of the transcriptional activity of the protein and in part due to indirect inhibition by controlling the concentration of p63.
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Sathyamurthy A, Freund SMV, Johnson CM, Allen MD, Bycroft M. Structural basis of p63α SAM domain mutants involved in AEC syndrome. FEBS J 2011; 278:2680-8. [DOI: 10.1111/j.1742-4658.2011.08194.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Romano R, Solomon L, Sinha S. Tp63 in Oral Development, Neoplasia, and Autoimmunity. J Dent Res 2011; 91:125-32. [DOI: 10.1177/0022034511411302] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The Tp63 gene encodes for multiple isoforms of the p63 transcription factor, a member of the p53 family of proteins. Much like its more famous sibling, the biological role of p63 is quite complex, with wide-ranging effects on development, differentiation, and cellular lineage choices. The crucial function of p63 is epitomized by the striking phenotype of p63 knockout mice. These animals have a profound block in the development of stratified epithelia and aplasia of multiple ectodermal appendages, as well as orofacial clefting and limb defects. Remarkably, a similar spectrum of phenotypic alterations is observed in human syndromes resulting from Tp63 gene mutations. p63 is an important hub in the transcriptional and signaling networks of epithelial cells; thus, it is not surprising that dysregulation of this transcription factor is associated with squamous cell carcinoma. Finally, as a testament to the growing repertoire of p63-associated diseases, autoantibodies to p63 are associated with chronic ulcerative stomatitis, an oral immunologically mediated disease. Over the past decade, our understanding of the broad biologic and pathophysiological roles of p63 has grown significantly. In this review, we discuss the molecular attributes of Tp63 and the clinical consequences of Tp63 dysregulation, particularly as it pertains to oral tissues.
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Affiliation(s)
- R.A. Romano
- State University of New York at Buffalo, Department of Biochemistry, Buffalo, NY, USA
| | - L.W. Solomon
- Tufts University School of Dental Medicine, Department of Oral and Maxillofacial Pathology, One Kneeland Street, DHS 646-A, Boston, MA 02111-1527, USA
| | - S. Sinha
- State University of New York at Buffalo, Department of Biochemistry, Buffalo, NY, USA
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36
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Abstract
The transcription factor p63 is essential for the formation of the epidermis and other stratifying epithelia. This is clearly demonstrated by the severe abnormality of p63-deficient mice and by the development of certain types of ectodermal dysplasias in humans as a result of p63 mutations. Investigation of the in vivo functions of p63 is complicated by the occurrence of 10 different splicing isoforms and by its interaction with the other family members, p53 and p73. In vitro and in vivo models have been used to unravel the functions of p63 and its different isoforms, but the results or their interpretation are often contradictory. This review focuses on what mammalian in vivo models and patient studies have taught us in the last 10 years.
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Affiliation(s)
- Hans Vanbokhoven
- Department of Human Genetics, Molecular Neurogenetics Unit, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Abstract
One of the basic principles that nature uses in evolution is to recycle successful concepts and create new functions by modifying existing units. This conservatism in evolution has resulted in an astonishingly high sequence identity of genes, even between evolutionarily distant species such as the nematode Caenorhabditis elegans and Homo sapiens. The recycling of successful concepts in conjunction with gene duplication events has also led to the existence of highly homologous proteins within the genome of many species. Often, these homologous proteins show similar, yet distinct functions that, in combination with their individual tissue distribution, define their specific physiological role. One prominent example is the p53 protein family, which consists of p53, p63, and p73. Recent advances in understanding the specific biological functions of these members have shed some light onto the evolution of this crucial protein family, from a germ line-specific quality-control factor to a somatic tumor suppressor. Furthermore, structures of the oligomerization domains of the mammalian paralogs, p53 and p73, and invertebrate orthologs, CEP-1 and DMP53, have delineated evolutionary changes and revealed that the oligomerization domain of p53 lacks additional stabilizing structural elements present in all other p53 family members. This suggests that p53 is the most recent evolutionary member of this protein family and predicts a mechanism for p53 activation.
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Clements S, Techanukul T, Holden S, Mellerio J, Dorkins H, Escande F, McGrath J. Rapp-Hodgkin and Hay-Wells ectodermal dysplasia syndromes represent a variable spectrum of the same genetic disorder. Br J Dermatol 2010; 163:624-9. [DOI: 10.1111/j.1365-2133.2010.09859.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Dötsch V, Bernassola F, Coutandin D, Candi E, Melino G. p63 and p73, the ancestors of p53. Cold Spring Harb Perspect Biol 2010; 2:a004887. [PMID: 20484388 DOI: 10.1101/cshperspect.a004887] [Citation(s) in RCA: 251] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
p73 and p63 are two homologs of the tumor suppressive transcription factor p53. Given the high degree of structural similarity shared by the p53 family members, p73 and p63 can bind and activate transcription from the majority of the p53-responsive promoters. Besides overlapping functions shared with p53 (i.e., induction of apoptosis in response to cellular stress), the existence of extensive structural variability within the family determines unique roles for p63 and p73. Their crucial and specific functions in controlling development and differentiation are well exemplified by the p63 and p73 knockout mouse phenotypes. Here, we describe the contribution of p63 and p73 to human pathology with emphasis on their roles in tumorigenesis and development.
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Affiliation(s)
- V Dötsch
- Institute of Biophysical Chemistry, Goethe University, Frankfurt am Main, Germany
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Bree AF. Clinical lessons learned from the International Research Symposium on Ankyloblepharon-Ectodermal Defects-Cleft Lip/Palate (AEC) syndrome. Am J Med Genet A 2010; 149A:1894-9. [PMID: 19676057 DOI: 10.1002/ajmg.a.32788] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The International Research Symposium on Ankyloblepharon-Ectodermal Defects-Cleft Lip/Palate ((AEC) Syndrome, that was supported by the National Foundation for Ectodermal Dysplasias (NFED) through a grant from the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) and the National Institutes of Health Office of Rare Diseases (NIH-ORD), brought together physicians, scientists, and 23 individuals affected by AEC syndrome from 13 families. Eighteen of the AEC-affected individuals were enrolled in an IRB-approved protocol through Baylor College of Medicine. Enrolled participants had clinical evaluations by multiple subspecialists, and additionally submitted blood for mutational analysis and skin specimens for pathologic evaluation. One of the goals of the conference was to define clinical and pathologic findings for improved diagnostic criteria, with the hope of determining genotype-phenotype correlations that might aid in predicting prognosis or directing therapeutics. What we found was wide interfamilial and intrafamilial variability in the manifestations of the syndrome. We were unable to identify any specific genotype-phenotype correlations. This may relate to our small sample size or other unknown epigenetic factors that are also at play in the expression and manifestation of the syndrome in specific individuals.
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Affiliation(s)
- Alanna F Bree
- Department of Pediatric Dermatology, Texas Children's Hospital, Baylor College of Medicine, 6621 Fannin Street CC 620.16, Houston, TX 77030, USA.
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Sutton VR, Plunkett K, Dang DX, Lewis RA, Bree AF, Bacino CA. Craniofacial and anthropometric phenotype in ankyloblepharon-ectodermal defects-cleft lip/palate syndrome (Hay-Wells syndrome) in a cohort of 17 patients. Am J Med Genet A 2010; 149A:1916-21. [PMID: 19676059 DOI: 10.1002/ajmg.a.32791] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Ankyloblepharon-ectodermal dysplasia-cleft lip/palate (AEC) syndrome and Rapp-Hodgkin syndrome are well-characterized clinical entities caused by mutations in the TP63 gene. While AEC and Rapp-Hodgkin had been thought to be clinically distinct entities, the elucidation of their molecular etiology confirmed that they are a clinical continuum as opposed to distinct disorders. We have evaluated 17 patients with AEC syndrome using a systematic clinical approach. In our study, we have identified new features and others that were thought to occur only rarely. These include short stature and poor weight gain with preservation of head circumference in nearly all subjects, trismus in 35% and hypospadias in 78% of males. In addition, we describe the frequency of phenotypic features and demonstrate the extreme clinical variability in the largest cohort of AEC individuals reported in the literature thus far.
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Affiliation(s)
- V Reid Sutton
- Department of Molecular and Human Genetics, Baylor College of Medicine, Texas Children's Hospital, 6621 Fannin Street, Houston, TX 77030, USA
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Cole P, Hatef DA, Kaufman Y, Magruder A, Bree A, Friedman E, Sindwani R, Hollier LH. Facial clefting and oroauditory pathway manifestations in ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome. Am J Med Genet A 2009; 149A:1910-5. [DOI: 10.1002/ajmg.a.32836] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Fete M, vanBokhoven H, Clements S, McKeon F, Roop DR, Koster MI, Missero C, Attardi LD, Lombillo VA, Ratovitski E, Julapalli M, Ruths D, Sybert VP, Siegfried EC, Bree AF. International Research Symposium on Ankyloblepharon-Ectodermal Defects-Cleft Lip/Palate (AEC) syndrome. Am J Med Genet A 2009; 149A:1885-93. [PMID: 19353643 PMCID: PMC2736474 DOI: 10.1002/ajmg.a.32761] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome (Hay-Wells syndrome, MIM #106220) is a rare autosomal dominant ectodermal dysplasia syndrome. It is due to mutations in the TP63 gene, known to be a regulatory gene with many downstream gene targets. TP63 is important in the differentiation and proliferation of the epidermis, as well as many other processes including limb and facial development. It is also known that mutations in TP63 lead to skin erosions. These erosions, especially on the scalp, are defining features of AEC syndrome and cause significant morbidity and mortality in these patients. It was this fact that led to the 2003 AEC Skin Erosion Workshop. That conference laid the groundwork for the International Research Symposium for AEC Syndrome held at Texas Children's Hospital in 2006. The conference brought together the largest cohort of individuals with AEC syndrome, along with a multitude of physicians and scientists. The overarching goals were to define the clinical and pathologic findings for improved diagnostic criteria, to obtain tissue samples for further study and to define future research directions. The symposium was successful in accomplishing these aims as detailed in this conference report. Following our report, we also present 11 manuscripts within this special section that outline the collective clinical, pathologic, and mutational data from 18 individuals enrolled in the concurrent Baylor College of Medicine IRB-approved protocol: Characterization of AEC syndrome. These collaborative findings will hopefully provide a stepping-stone to future translational projects of TP63 and TP63-related syndromes.
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Affiliation(s)
- Mary Fete
- The National Foundation for Ectodermal Dysplasias (NFED), Mascoutah, Illinosis
| | - Hans vanBokhoven
- Department of Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Suzanne Clements
- Genetic Skin Disease Group, St. John's Institute of Dermatology; Division of Genetics and Molecular Medicine; The Guy's, King's College and St. Thomas School of Medicine, London, United Kingdom
| | - Frank McKeon
- Department of Cell Biology, Harvard University Medical School, Boston, Massachusetts
| | - Dennis R. Roop
- Department of Dermatology and Charles C. Gates Regenerative Medicine and Stem Cell Biology Program, University of Colorado Denver, Aurora, Colorado
| | - Maranke I. Koster
- Department of Dermatology and Charles C. Gates Regenerative Medicine and Stem Cell Biology Program, University of Colorado Denver, Aurora, Colorado
| | | | - Laura D. Attardi
- Departments of Radiation Oncology and Genetics, Stanford University School of Medicine, Stanford, California
| | | | - Edward Ratovitski
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Meena Julapalli
- Department of Dermatology and Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Derek Ruths
- Department of Computer Science, Rice University, Houston, Texas
| | - Virginia P. Sybert
- Department of Dermatology, University of Washington and Group Health Permanente, Seattle, Washington
| | - Elaine C. Siegfried
- Departments of Pediatrics and Dermatology, Saint Louis University, St. Louis, Missouri
| | - Alanna F. Bree
- Department of Dermatology and Pediatrics, Baylor College of Medicine, Houston, Texas
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