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Journal of Medical Genetics Oct 1995
Review
Topics: Humans; Mandibulofacial Dysostosis; Syndrome
PubMed: 8558560
DOI: 10.1136/jmg.32.10.806 -
Genes Dec 2023Nager syndrome is a rare human developmental disorder characterized by craniofacial defects including the downward slanting of the palpebral fissures, cleft palate, limb... (Review)
Review
Nager syndrome is a rare human developmental disorder characterized by craniofacial defects including the downward slanting of the palpebral fissures, cleft palate, limb deformities, mandibular hypoplasia, hypoplasia or absence of thumbs, microretrognathia, and ankylosis of the temporomandibular joint. The prevalence is very rare and the literature describes only about a hundred cases of Nager syndrome. There is evidence of autosomal dominant and autosomal recessive inheritance for Nager syndrome, suggesting genetic heterogeneity. The majority of the described causes of Nager syndrome include pathogenic variants in the gene, which encodes a component of the spliceosome; therefore, the syndrome belongs to the spliceosomopathy group of diseases. The diagnosis is made on the basis of physical and radiological examination and detection of mutations in the gene. Due to the diversity of defects associated with Nager syndrome, patients require multidisciplinary, complex, and long-lasting treatment. Usually, it starts from birth until the age of twenty years. The surgical procedures vary over a patient's lifetime and are related to the needed function. First, breathing and feeding must be facilitated; then, oral and facial clefts should be addressed, followed by correcting eyelid deformities and cheekbone reconstruction. In later age, a surgery of the nose and external ear is performed. Speech and hearing disorders require specialized logopedic treatment. A defect of the thumb is treated by transplanting a tendon and muscle or transferring the position of the index finger. In addition to surgery, in order to maximize a patient's benefit and to reduce functional insufficiency, complementary treatments such as rehabilitation and physiotherapy are recommended. In our study, we describe eight patients of different ages with various cases of Nager syndrome. The aim of our work was to present the actual genetic knowledge on this disease and its treatment procedures.
Topics: Child; Humans; Young Adult; Adult; Mandibulofacial Dysostosis; Cleft Palate; Micrognathism; Syndrome; RNA Splicing Factors
PubMed: 38254920
DOI: 10.3390/genes15010029 -
Biochimica Et Biophysica Acta Jun 2014The skeleton affords a framework and structural support for vertebrates, while also facilitating movement, protecting vital organs, and providing a reservoir of minerals... (Review)
Review
The skeleton affords a framework and structural support for vertebrates, while also facilitating movement, protecting vital organs, and providing a reservoir of minerals and cells for immune system and vascular homeostasis. The mechanical and biological functions of the skeleton are inextricably linked to the size and shape of individual bones, the diversity of which is dependent in part upon differential growth and proliferation. Perturbation of bone development, growth and proliferation, can result in congenital skeletal anomalies, which affect approximately 1 in 3000 live births [1]. Ribosome biogenesis is integral to all cell growth and proliferation through its roles in translating mRNAs and building proteins. Disruption of any steps in the process of ribosome biogenesis can lead to congenital disorders termed ribosomopathies. In this review, we discuss the role of ribosome biogenesis in skeletal development and in the pathogenesis of congenital skeletal anomalies. This article is part of a Special Issue entitled: Role of the Nucleolus in Human Disease.
Topics: Anemia, Diamond-Blackfan; Bone Development; Bone Diseases, Developmental; Bone Marrow Diseases; Exocrine Pancreatic Insufficiency; Hair; Hirschsprung Disease; Humans; Immunologic Deficiency Syndromes; Lipomatosis; Mandibulofacial Dysostosis; Osteochondrodysplasias; Primary Immunodeficiency Diseases; RNA, Messenger; Ribosomes; Shwachman-Diamond Syndrome; Skeleton
PubMed: 24252615
DOI: 10.1016/j.bbadis.2013.11.010 -
Discovery Medicine 2021In eukaryotes, spliceosomes catalyze the splicing of pre-mRNA to mature mRNA. As the core subunit of U2 spliceosome, splicing factor SF3b4 plays not only a crucial role... (Review)
Review
In eukaryotes, spliceosomes catalyze the splicing of pre-mRNA to mature mRNA. As the core subunit of U2 spliceosome, splicing factor SF3b4 plays not only a crucial role in the splicing process, but also a role in transcription, translation, and cell signal transduction, and participates in the regulation of cell cycle, cell differentiation, and immune deficiency. In recent years, more and more research studies on SF3b4-related diseases, such as Nager syndrome and cancer, have been conducted. It has been found that SF3b4 mutations led to abnormal cell growth and were involved in the development and occurrence of these diseases. In this review, the diseases, mainly congenital diseases and tumors, in which SF3B4 is involved and the pathogenesis of them were summarized, aiming to provide a better understanding of the roles of SF3B4 in the prevention, diagnosis, and treatment of diseases in the future.
Topics: Humans; Mandibulofacial Dysostosis; Mutation; Neoplasms; RNA Splicing; RNA Splicing Factors
PubMed: 35220998
DOI: No ID Found -
Journal of Medicine and Life 2021Facial dysostoses are clinically and genetically heterogeneous conditions characterized by congenital craniofacial anomalies which result from abnormal development of...
Facial dysostoses are clinically and genetically heterogeneous conditions characterized by congenital craniofacial anomalies which result from abnormal development of the first two pharyngeal arches and their derivatives during embryogenesis. Mandibulofacial dysostosis Guion-Almeida type (MFDGA) is a rare and relatively new syndrome described in the literature, first identified by Guion-Almeida in 2000 and 2006. Another 108 cases have been documented after that. Prenatal diagnosis of this syndrome has not been described yet. Here we present the prenatal ultrasound findings in a case where MFDGA was confirmed after delivery. We suggest that MFDGA should be included in the prenatal differential diagnosis of syndromes with micrognathia and craniofacial anomalies.
Topics: Female; Humans; Intellectual Disability; Mandibulofacial Dysostosis; Peptide Elongation Factors; Pregnancy; Ribonucleoprotein, U5 Small Nuclear; Syndrome
PubMed: 35027977
DOI: 10.25122/jml-2020-0082 -
Human Molecular Genetics Aug 2018Ribosome biogenesis is a global process required for growth and proliferation in all cells, but disruptions in this process surprisingly lead to tissue-specific...
Ribosome biogenesis is a global process required for growth and proliferation in all cells, but disruptions in this process surprisingly lead to tissue-specific phenotypic disorders termed ribosomopathies. Pathogenic variants in the RNA Polymerase (Pol) I subunit POLR1A cause Acrofacial Dysostosis-Cincinnati type, which is characterized by craniofacial and limb anomalies. In a zebrafish model of Acrofacial Dysostosis-Cincinnati type, we demonstrate that polr1a-/- mutants exhibit deficient 47S rRNA transcription, reduced monosomes and polysomes and, consequently, defects in protein translation. This results in Tp53-dependent neuroepithelial apoptosis, diminished neural crest cell proliferation and cranioskeletal anomalies. This indicates that POLR1A is critical for rRNA transcription, which is considered a rate limiting step in ribosome biogenesis, underpinning its requirement for neuroepithelial cell and neural crest cell proliferation and survival. To understand the contribution of the Tp53 pathway to the pathogenesis of Acrofacial Dysostosis-Cincinnati type, we genetically inhibited tp53 in polr1a-/- mutant embryos. Tp53 inhibition suppresses neuroepithelial apoptosis and partially ameliorates the polr1a mutant phenotype. However, complete rescue of cartilage development is not observed due to the failure to improve rDNA transcription and neural crest cell proliferation. Altogether, these data reveal specific functions for both Tp53-dependent and independent signaling downstream of polr1a in ribosome biogenesis during neural crest cell and craniofacial development, in the pathogenesis of Acrofacial Dysostosis-Cincinnati type. Furthermore, our work sets the stage for identifying Tp53-independent therapies to potentially prevent Acrofacial dysostosis-Cincinnati type and other similar ribosomopathies.
Topics: Animals; Cell Differentiation; Cell Proliferation; Disease Models, Animal; Embryo, Nonmammalian; Gene Expression Regulation, Developmental; Humans; Limb Deformities, Congenital; Mandibulofacial Dysostosis; Mutation; Neural Crest; RNA Polymerase I; Signal Transduction; Tumor Suppressor Protein p53; Zebrafish; Zebrafish Proteins
PubMed: 29750247
DOI: 10.1093/hmg/ddy172 -
The Cleft Palate-craniofacial Journal :... Sep 2023This paper describes 20 years of microtia and craniofacial microsomia (CFM) psychosocial and healthcare studies and suggests directions for clinical care and research. A... (Review)
Review
This paper describes 20 years of microtia and craniofacial microsomia (CFM) psychosocial and healthcare studies and suggests directions for clinical care and research. A narrative review of papers January 2000 to July 2021 related to psychosocial and healthcare experiences of individuals with microtia and CFM and their families. Studies (N = 64) were mainly cross-sectional (69%), included a range of standardized measures (64%), and were with European (31%), American (27%), or multinational (23%) samples. Data were generally collected from both patients and caregivers (38%) or patient self-report (35%). Sample sizes were 11 to 25 (21%), 26 to 50 (19%), 51 to 100 (22%), or over 100 (38%). Studies addressed 5 primary topics: (1) Healthcare Experiences, including Medical Care, Hearing Loss/Amplification, Diagnostic Experiences, and Information Preferences; (2) Psychosocial Experiences, including Teasing, Behavioral Adjustment, Psychosocial Support, and Public Perception; (3) Neurocognitive Functioning and Academic Assistance; (4) Pre- and Post-Operative Psychosocial Outcomes of Ear Reconstruction/Canaloplasty; and (5) Quality of Life and Patient Satisfaction. Care involved multiple specialties and was often experienced as stressful starting at diagnosis. Psychosocial and neurocognitive functioning were generally in the average range, with possible risk for social and language concerns. Coping and resiliency were described into adulthood. Satisfaction and positive benefit of ear reconstruction/canaloplasty were high. Care recommendations include increasing: hearing amplification use, microtia and CFM knowledge among providers, efficient treatment coordination, psychosocial support, academic assistance, and advances to minimize surgical scarring. This broad literature overview informs clinical practice and research to improve psychosocial outcomes.
Topics: Humans; United States; Goldenhar Syndrome; Congenital Microtia; Quality of Life; Cross-Sectional Studies; Adaptation, Psychological
PubMed: 35382590
DOI: 10.1177/10556656221091699 -
Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi... Jun 2019Treacher Collins syndrome is a congenital craniofacial malformation with autosomal dominant inheritance as the main genetic pattern. In this condition, the biosynthesis... (Review)
Review
Treacher Collins syndrome is a congenital craniofacial malformation with autosomal dominant inheritance as the main genetic pattern. In this condition, the biosynthesis of ribosomes in neural crest cells and neuroepithelial cells is blocked and the number of neural crest cells that migrate to the craniofacial region decreases, causing first and second branchial arch dysplasia. Definite causative genes include treacle ribosome biogenesis factor 1 (tcof1), RNA polymerase Ⅰ and Ⅲ subunit C (polr1c), and RNA polymerase Ⅰ and Ⅲ subunit D (polr1d). This paper provides a review of research of three major patho-genic genes, pathogenesis, phenotypic research, prevention, and treatment of the syndrome.
Topics: DNA-Directed RNA Polymerases; Humans; Mandibulofacial Dysostosis; Neural Crest; Nuclear Proteins; Phosphoproteins
PubMed: 31218872
DOI: 10.7518/hxkq.2019.03.020 -
Journal of Medical Genetics Jun 2009Microtia is a congenital anomaly, characterised by a small, abnormally shaped auricle (pinna). It is usually accompanied by a narrow, blocked or absent ear canal.... (Review)
Review
Microtia is a congenital anomaly, characterised by a small, abnormally shaped auricle (pinna). It is usually accompanied by a narrow, blocked or absent ear canal. Microtia can occur as the only clinical abnormality or as part of a syndrome. The estimated prevalence of microtia is 0.8-4.2 per 10 000 births, and it is more common in men. Microtia can have a genetic or environmental predisposition. Mendelian hereditary forms of microtia with an autosomal dominant or recessive mode of inheritance, and some forms due to chromosomal aberrations have been reported. Several responsible genes have been identified, most of them being homeobox genes. Mouse models have been very useful to study these genes, providing valuable information on the development of the auditory system. In this article, we review the epidemiological characteristics of microtia and the environmental causes involved. In addition, we discuss the development of the auditory system, specifically the relevant aspects of external and middle ear development. The focus of this review is to discuss the genetic aspects of microtia and associated syndromes. The clinical aspects of various disorders involving microtia are also discussed in relation to the genes that are causing them.
Topics: Abnormalities, Multiple; Animals; Chromosome Aberrations; Disease Models, Animal; Ear Auricle; Ear, External; Environment; Goldenhar Syndrome; Humans; Mice; Risk Factors; Syndrome
PubMed: 19293168
DOI: 10.1136/jmg.2008.062158 -
Indian Journal of Ophthalmology Jun 1973
Topics: Abnormalities, Multiple; Adolescent; Child, Preschool; Dermoid Cyst; Ear, External; Eye Neoplasms; Female; Humans; Lipoma; Mandibulofacial Dysostosis; Syndrome
PubMed: 4789118
DOI: No ID Found