RESUMO
BACKGROUND: Noncommunicable diseases (NCDs) pose a significant global health challenge. Primary health centres are pivotal in addressing this challenge by providing essential care to NCD patients. The WHO Package of Essential Noncommunicable (PEN) disease interventions has been designed to enhance the quality of NCD consultations and ensure adherence to the protocol. This study investigates the effects of PEN training in Moldova. OBJECTIVES: The primary objective of this study is to assess the effects of training on WHO PEN on the quality of NCD consultations and adherence to the PEN protocol in a real -world setting in primary health centres in Moldova. METHODS: An observational, cross-sectional study was conducted, comparing primary health centres where health personnel received PEN training, provided by the Healthy Life project, to those where such training was not provided. In total, 24 family doctors and 24 medical assistants were observed for 233 workdays and covering 2,166 NCD consultations. RESULTS: Intervention primary health centres (PHCs) showed longer NCD consultation durations, with family doctors and medical assistants spending an added 1 minute 43 seconds and 3 minutes 10 seconds, respectively. These PHCs also reported a higher proportion of primary NCD consultations, indicating better screening for new NCD patients. Medical assistants in the intervention group took on a more pronounced role in NCD care. However, the findings also highlight the necessity to refine aspects of the PEN training, especially concerning follow-up consultations, risk assessments, and task delegation. CONCLUSIONS: The findings suggest that the PEN training contributed to improvement of both the quality of NCD consultations and adherence to the PEN protocol. Yet, there is a need for enhancing the identified aspects of the PEN training. The findings highlight the potential of PEN training in primary healthcare settings for improved NCD management.
Assuntos
Doenças não Transmissíveis , Humanos , Estudos Transversais , Moldávia , Doenças não Transmissíveis/prevenção & controle , Estudos Observacionais como Assunto , Encaminhamento e Consulta , Organização Mundial da SaúdeRESUMO
Background: This study assessed the diagnostic yield of high-throughput sequencing methods in a cohort of craniosynostosis (CS) patients not presenting causal variants identified through previous targeted analysis. Methods: Whole-genome or whole-exome sequencing (WGS/WES) was performed in a cohort of 59 patients (from 57 families) assessed by retrospective phenotyping as having syndromic or nonsyndromic CS. Results: A syndromic form was identified in 51% of the unrelated cases. A genetic cause was identified in 38% of syndromic cases, with novel variants detected in FGFR2 (a rare Alu insertion), TWIST1, TCF12, KIAA0586, HDAC9, FOXP1, and NSD2. Additionally, we report two patients with rare recurrent variants in KAT6A and YY1 as well as two patients with structural genomic aberrations: one with a 22q13 duplication and one with a complex rearrangement involving chromosome 2 (2p25 duplication including SOX11 and deletion of 2q22). Moreover, we identified potentially relevant variants in 87% of the remaining families with no previously detected causal variants, including novel variants in ADAMTSL4, ASH1L, ATRX, C2CD3, CHD5, ERF, H4C5, IFT122, IFT140, KDM6B, KMT2D, LTBP1, MAP3K7, NOTCH2, NSD1, SOS1, SPRY1, POLR2A, PRRX1, RECQL4, TAB2, TAOK1, TET3, TGFBR1, TCF20, and ZBTB20. Conclusion: These results confirm WGS/WES as a powerful diagnostic tool capable of either targeted in silico or broad genomic analysis depending on phenotypic presentation (e.g., classical or unusual forms of syndromic CS).
RESUMO
Here, we have studied the prevalence and spectrum of genetic alterations in syndromic forms of sagittal and pansynostosis. Eighteen patients with sagittal synostosis (isolated or combined with other synostoses, except coronal) or pansynostosis were phenotypically assessed by retrospective analysis of medical records, three-dimensional computed tomography skull reconstructions, and registered photos. Patient DNAs were analyzed using a targeted next-generation sequencing (NGS) panel including 63 craniosynostosis (CS) related genes. Pathogenic and likely pathogenic variants were found in 72% of the cases, mainly affecting FGFR2, TWIST1, IL11RA, and SKI. Two patients that were negative at NGS screening - one with a supernumerary marker chromosome with duplication of 15q25.2q26.3 and one with a pathogenic PHEX variant - were identified using microarray and single gene analysis, respectively. The overall diagnostic rate in the cohort was thus 83%. We identified two novel likely pathogenic variants in FGFR2 (NM_022970.3: c.811_812delGGinsCC, p.Gly271Pro) and TWIST1 (NM_000474.3: c.476T > A, p.Leu159His), and a novel variant of unclear phenotypic significance in RUNX2 (NM_001024630.3: c.340G > A, p.Val114Ile) which could suggest a modulatory effect. Notably, we also identified three new patients with pansynostosis and a Crouzon-like phenotype with IL11RA mutation. Targeted NGS using a broad panel of CS-related genes is a simple and powerful tool for detecting pathogenic mutations in patients with syndromic forms of CS and multiple suture involvement, in particular pansynostosis. Our results provide additional evidence of an association between pansynostosis and IL11RA, an emerging core gene for autosomal recessive CS.
Assuntos
Craniossinostoses , Craniossinostoses/diagnóstico , Craniossinostoses/genética , Craniossinostoses/patologia , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Subunidade alfa de Receptor de Interleucina-11/genética , Mutação , Fenótipo , Estudos RetrospectivosRESUMO
BACKGROUND: A new two-year Post University Specialty Training (PUST) programme in family medicine was introduced to improve the quality of postgraduate speciality medical education in Tajikistan. Postgraduate education of family doctors (FDs) needs to be urgently scaled up, as 38% of FD positions in Tajikistan remained unfilled in 2018. Moreover, the international financial support for the PUST programme is ending. This investment case assesses the minimum funding needed for the continuation and scale-up of PUST and establishes the rationale for the investment in the light of a recent evaluation. METHODS: The costs of the programme were calculated for 2018 and a scale-up forecast made for the period 2019-2023. The impact of the scale-up on the shortage of FDs was assessed. An evaluation using a Multiple Choice Questionnaire and Objective Structured Clinical Examination (OSCE) assessed and compared theoretical knowledge, clinical skills and competencies of PUST trained and conventionally trained FDs. RESULTS: The annual costs of the programme were US$ 228,000 in 2018. The total investment needed for scaling up PUST from 31 new FDs in 2018 to 100 FD graduates each year by 2023 was US$ 802,000.However, when the retirement of FDs and population growth are considered, the scale-up will result only in maintaining the current level of FDs working and not solve the country's FD shortage. The PUST FDs demonstrated significantly better clinical skills than the conventionally trained interns, scoring 60 and 45% of OSCE points, respectively. Theoretical knowledge showed a similar trend; PUST FDs answered 44% and interns 38% of the questions correctly. CONCLUSIONS: The two-year PUST programme has clearly demonstrated it produces better skilled family doctors than the conventional one-year internship, albeit some enduring quality concerns do still prevail. The discontinuation of international support for PUST would be a major setback and risks potentially losing the benefits of the programme for family medicine and also other specialities. To guarantee the supply of adequately trained FDs and address the FD shortage, the PUST should be continued and scaled up. Therefore, it is essential that international support is extended and a gradual transition to sustainable national financing gets underway.
Assuntos
Medicina de Família e Comunidade , Internato e Residência , Humanos , Médicos de Família , Tadjiquistão , UniversidadesRESUMO
PURPOSE: Congenital anophthalmia (A) and microphthalmia (M) are rare developmental defects, which could be isolated or syndromic. Our objective was to describe a cohort of children and young adults with A/M treated with ocular prosthesis, emphasizing clinical features, diagnosis, treatment, and follow-up. METHODS: Eighteen individuals (10 female) with unilateral A (n = 3) and M (n = 15) with a mean age of 9.5 years (range 0.8-31.8) and treated with ocular prosthesis were included. Data on medical history, clinical examinations and management of ocular prosthesis were collected. Genetic screening with microarray and whole-exome sequencing targeting 121 A/M-related genes was performed. RESULTS: A/M appeared isolated (seven cases) or as part of a syndromic condition (11 cases). In 4/16 patients, mutations were detected in TFAP2A, CHD7, FOXE3 and BCOR-genes. In one patient, a possibly causal microdeletion 10q11 was shown. Associated ocular anomalies such as cataract and cysts were found in 16 (89%) of the A/M eyes, and in nine (50%) ophthalmological findings were found in the fellow eyes. The median ages at which the conformer and ocular prosthesis first were initiated were 7.8 months and 1.5 years. 16/17 patients fulfilled satisfactory orbital growth and cosmetic results when treated with ocular prosthesis from an early age. CONCLUSION: Based upon our findings, a multidisciplinary approach, including genetic assessment, is necessary to cover all aspects of A/M. Imaging, ultrasound and visual evoked potentials should be included. Early management is crucial for the outcome, in terms of non-ocular findings, vision in the fellow eye, and for facial cosmetic development.
Assuntos
Anoftalmia/diagnóstico , Gerenciamento Clínico , Microftalmia/diagnóstico , Adolescente , Adulto , Anoftalmia/terapia , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Microftalmia/terapia , Fenótipo , Prognóstico , Adulto JovemRESUMO
PURPOSE: To evaluate health-related quality of life (HR-QoL), vision-related (VR-)QoL and perceptual visual dysfunction (PVD) among individuals with anophthalmia (A) and microphthalmia (M) treated with ocular prosthesis. METHODS: The study comprised 15 individuals (mean age 6.6 years; range 1.7-14.1) with unilateral A or M. Three validated instruments measuring HR-QoL and VR-QoL were used: The Pediatric QoL Inventory (PedsQL), consisting of physical and psychosocial self-report and parent-proxy report (2-18 years); Children's Visual Function Questionnaire (CVFQ); and Effects of Youngsters' Eyesight on Quality of Life (EYE-Q). Perceptual visual dysfunctions (PVDs) were assessed by history taking according to a specific protocol. RESULTS: A/M children and their parents showed low HR-QoL scores (PedsQL total score: 66.3; 69.6) compared with controls (83.0; 87.61) (p = 0.0035 and <0.0001, respectively, unpaired t-test). No differences were found between A/M children and parents, but parents tended to underestimate their children's emotional state. A/M children with subnormal visual acuity (VA) for age scored lower in physical health compared with A/M children with normal VA (p = 0.03, Mann-Whitney U-test). No significant VR-QoL differences between A/M children and references or between A/M children with subnormal or normal VA for age were found. More A/M children than controls exhibited PVDs in ≥1 area (7/11 versus 4/118; p < 0.0001, Fisher's exact test). CONCLUSION: A/M individuals show poor HR-QoL and increased PVDs. No difference in QoL was found between children and parents, though the children tended to score lower in emotional well-being. A/M children with subnormal VA showed lower physical health score. These problems indicate the necessity of a thorough multidisciplinary assessment and follow-up of children with A/M.
Assuntos
Anoftalmia/fisiopatologia , Olho Artificial , Microftalmia/fisiopatologia , Qualidade de Vida , Acuidade Visual , Adolescente , Anoftalmia/psicologia , Anoftalmia/cirurgia , Criança , Pré-Escolar , Feminino , Seguimentos , Humanos , Lactente , Masculino , Microftalmia/psicologia , Microftalmia/cirurgia , Estudos Retrospectivos , Inquéritos e QuestionáriosRESUMO
Craniosynostosis (CS), the premature closure of one or more cranial sutures, occurs both as part of a syndrome or in isolation (nonsyndromic form). Here, we have studied the prevalence and spectrum of genetic alterations associated with coronal suture closure in 100 Scandinavian patients treated at a single craniofacial unit. All patients were phenotypically assessed and analyzed with a custom-designed 63 gene NGS-panel. Most cases (78%) were syndromic forms of CS. Pathogenic and likely pathogenic variants explaining the phenotype were found in 80% of the families with syndromic CS and in 14% of those with nonsyndromic CS. Sixty-five percent of the families had mutations in the CS core genes FGFR2, TWIST1, FGFR3, TCF12, EFNB1, FGFR1, and POR. Five novel pathogenic/likely pathogenic variants in TWIST1, TCF12, and EFNB1 were identified. We also found novel variants in SPECC1L, IGF1R, and CYP26B1 with a possible modulator phenotypic effect. Our findings demonstrate that NGS targeted sequencing is a powerful tool to detect pathogenic mutations in patients with coronal CS and further emphasize the importance of thorough assessment of the patient's phenotype for reliable interpretation of the molecular findings. This is particularly important in patients with complex phenotypes and rare forms of CS.
Assuntos
Anormalidades Craniofaciais/genética , Craniossinostoses/genética , Predisposição Genética para Doença , Sequenciamento de Nucleotídeos em Larga Escala , Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética , Suturas Cranianas/patologia , Anormalidades Craniofaciais/epidemiologia , Anormalidades Craniofaciais/patologia , Craniossinostoses/epidemiologia , Craniossinostoses/patologia , Sistema Enzimático do Citocromo P-450/genética , Efrina-B1/genética , Feminino , Humanos , Masculino , Mutação/genética , Proteínas Nucleares/genética , Fenótipo , Receptor Tipo 1 de Fator de Crescimento de Fibroblastos/genética , Receptor Tipo 2 de Fator de Crescimento de Fibroblastos/genética , Receptor Tipo 3 de Fator de Crescimento de Fibroblastos/genética , Suécia/epidemiologia , Proteína 1 Relacionada a Twist/genéticaRESUMO
BACKGROUND: Tissue-specific integrative omics has the potential to reveal new genic elements important for developmental disorders. METHODS: Two pediatric patients with global developmental delay and intellectual disability phenotype underwent array-CGH genetic testing, both showing a partial deletion of the DLG2 gene. From independent human and murine omics datasets, we combined copy number variations, histone modifications, developmental tissue-specific regulation, and protein data to explore the molecular mechanism at play. RESULTS: Integrating genomics, transcriptomics, and epigenomics data, we describe two novel DLG2 promoters and coding first exons expressed in human fetal brain. Their murine conservation and protein-level evidence allowed us to produce new DLG2 gene models for human and mouse. These new genic elements are deleted in 90% of 29 patients (public and in-house) showing partial deletion of the DLG2 gene. The patients' clinical characteristics expand the neurodevelopmental phenotypic spectrum linked to DLG2 gene disruption to cognitive and behavioral categories. CONCLUSIONS: While protein-coding genes are regarded as well known, our work shows that integration of multiple omics datasets can unveil novel coding elements. From a clinical perspective, our work demonstrates that two new DLG2 promoters and exons are crucial for the neurodevelopmental phenotypes associated with this gene. In addition, our work brings evidence for the lack of cross-annotation in human versus mouse reference genomes and nucleotide versus protein databases.
Assuntos
Deficiências do Desenvolvimento/metabolismo , Éxons , Guanilato Quinases/genética , Deficiência Intelectual/metabolismo , Regiões Promotoras Genéticas , Proteínas Supressoras de Tumor/genética , Animais , Criança , Deficiências do Desenvolvimento/genética , Feminino , Humanos , Deficiência Intelectual/genética , Masculino , Proteínas de Membrana/genética , CamundongosRESUMO
X-linked recessive myotubular myopathy (XLMTM) is a disorder associated with mutations in the myotubularin gene (MTM1) that usually affects boys, with transmission of the mutated allele from the mother. Here we describe a family with unexpected grand paternal transmission of a novel mutation in MTM1 (c.646_648dupGTT; p.Val216dup) identified in a severely affected infant boy with a centronuclear myopathy. We confirmed the carrier status of the mother, but surprisingly we found that her father was a carrier of the mutated MTM1 gene together with wild-type MTM1. A muscle biopsy from the grandfather revealed occasional typical necklace fibers with internalized nucleus, which is typically found in MTM1-associated myopathies. Further analysis of the grandfather revealed equal amounts of DNA with the wild-type sequence and DNA with the c.646_648dupGTT variant in five different tissues examined. In the presence of a normal karyotype (46,XY) in the grandfather and no evidence of intragenic duplication of MTM1, the result was interpreted as postzygotic mosaicism and the mutation had probably occurred at the first mitosis of the zygote. This study demonstrates the importance of considering the possibility of paternal transmission in families with severe X-linked disorders. The muscle biopsy with the finding of typical necklace fibers was important to further establish the pathogenicity of the novel MTM1 mutation.
Assuntos
Mosaicismo , Mutação/genética , Miopatias Congênitas Estruturais/genética , Herança Paterna/genética , Feminino , Genes Ligados ao Cromossomo X , Humanos , Recém-Nascido , MasculinoRESUMO
Craniosynostosis has rarely been described in patients with Kabuki syndrome. We report here a boy with facial asymmetry due to combined premature synostosis of the right coronal and sagittal sutures as well as several symptoms reminiscent of Kabuki syndrome (KS). Our case supports previous observations and suggests that craniosynostosis is a part of the KS phenotype. The uniqueness of our case is the sporadic co-occurrence of two genetic disorders, that is, a de novo frameshift variant in the KMT2D gene and a de novo 3.2 Mbp 10q22.3q23.1 deletion. Our findings emphasize the importance of the initial clinical assessment of children with craniosynostosis and that genomic and monogenic disorders, such as Kabuki syndrome, should be considered among the differential diagnoses of syndromic forms of craniosynostosis.
Assuntos
Anormalidades Múltiplas/genética , Craniossinostoses/genética , Proteínas de Ligação a DNA/genética , Face/anormalidades , Doenças Hematológicas/genética , Proteínas de Neoplasias/genética , Doenças Vestibulares/genética , Anormalidades Múltiplas/fisiopatologia , Criança , Deleção Cromossômica , Cromossomos Humanos Par 10/genética , Craniossinostoses/complicações , Craniossinostoses/fisiopatologia , Face/fisiopatologia , Doenças Hematológicas/complicações , Doenças Hematológicas/fisiopatologia , Humanos , Masculino , Mutação , Fenótipo , Deleção de Sequência , Doenças Vestibulares/complicações , Doenças Vestibulares/fisiopatologiaRESUMO
Shwachman-Diamond-Bodian syndrome (SDS) is a pleiotropic disorder in which the main features are bone marrow dysfunction and pancreatic insufficiency. Skeletal changes can occur, and in rare cases manifest as severe congenital thoracic dystrophy. We report a newborn boy with asphyxia, narrow thorax, and severe hypotonia initially suggesting a neuromuscular disease. The muscle biopsy showed myopathic changes with prominent variability in muscle fiber size and abnormal expression of developmental isoforms of myosin. The myofibrils showed focal loss and disorganization of myofilaments, and thickening of the Z-discs including some abortive nemaline rods. The boy became permanently dependent on assisted ventilation. Pancreatic insufficiency was subsequently diagnosed, explaining the malabsorption and failure to thrive. Except transitory thrombocytopenia and leukopenia, no major hematological abnormalities were noted. He had bilateral nephrocalcinosis with preserved renal function. Transitory liver dysfunction with elevated transaminase levels and parenchymal changes on ultrasound were registered. The clinical diagnosis was confirmed by detection of compound heterozygous mutations in SBDS using whole-exome sequencing: a recurrent intronic mutation causing aberrant splicing (c.258+2T>C) and a novel missense variant in a highly conserved codon (c.41A>G, p.Asn14Ser), considered to be damaging for the protein structure by in silico prediction programs. The carrier status of the parents has been confirmed. This case illustrates the challenges in differential diagnosis of pronounced neonatal hypotonia with asphyxia and highlights the muscular involvement in SDS. To our knowledge, this is the first report of myopathy evidenced in a patient with clinically and molecularly confirmed SDS.
Assuntos
Doenças da Medula Óssea/genética , Insuficiência Pancreática Exócrina/genética , Lipomatose/genética , Doenças Musculares/genética , Miofibrilas/genética , Proteínas/genética , Biópsia , Doenças da Medula Óssea/fisiopatologia , Insuficiência Pancreática Exócrina/fisiopatologia , Exoma/genética , Humanos , Recém-Nascido , Lipomatose/fisiopatologia , Masculino , Doenças Musculares/fisiopatologia , Mutação de Sentido Incorreto , Miofibrilas/patologia , Miosinas/biossíntese , Miosinas/genética , Análise de Sequência de DNA , Síndrome de Shwachman-DiamondRESUMO
Anophthalmia/microphthalmia (A/M) are rare congenital eye malformations. Early intervention with ocular prosthesis can stimulate orbital growth and prevent facial asymmetry. We reviewed medical records from 18 individuals with A/M (0.8-31 years) treated with ocular prosthesis at Sahlgrenska University Hospital between 2000 and 2012. A majority had other ocular findings. Seven had subnormal visual acuity in the fellow eye, one third were in contact with vision support services and half of the group wore glasses. Eleven individuals had extra-ocular findings such as cardiac defect, hearing impairment and neuropsychiatric disorders, possibly indicating syndromic conditions. We suggest that investigation of A/M children should include ultrasound of the eye, optionally visual evoked potential and magnetic resonance imaging of the CNS. The ophthalmologist should initiate treatment with prosthesis, pediatric assessment, hearing tests and genetic counseling, but should also monitor visual development of the fellow eye.
Assuntos
Anoftalmia/terapia , Microftalmia/terapia , Adolescente , Adulto , Anoftalmia/complicações , Anoftalmia/diagnóstico , Anoftalmia/patologia , Criança , Pré-Escolar , Olho Artificial , Feminino , Transtornos da Audição/complicações , Cardiopatias Congênitas/complicações , Humanos , Lactente , Masculino , Microftalmia/complicações , Microftalmia/diagnóstico , Microftalmia/patologia , Implantes Orbitários , Equipe de Assistência ao Paciente , Transtornos Psicomotores/complicações , Transtornos da Visão/complicaçõesRESUMO
BACKGROUND: Cytogenetically visible chromosomal translocations are highly informative as they can pinpoint strong effect genes even in complex genetic disorders. METHODS AND RESULTS: Here, we report a mother and daughter, both with borderline intelligence and learning problems within the dyslexia spectrum, and two apparently balanced reciprocal translocations: t(1;8)(p22;q24) and t(5;18)(p15;q11). By low coverage mate-pair whole-genome sequencing, we were able to pinpoint the genomic breakpoints to 2â kb intervals. By direct sequencing, we then located the chromosome 5p breakpoint to intron 9 of CTNND2. An additional case with a 163â kb microdeletion exclusively involving CTNND2 was identified with genome-wide array comparative genomic hybridisation. This microdeletion at 5p15.2 is also present in mosaic state in the patient's mother but absent from the healthy siblings. We then investigated the effect of CTNND2 polymorphisms on normal variability and identified a polymorphism (rs2561622) with significant effect on phonological ability and white matter volume in the left frontal lobe, close to cortical regions previously associated with phonological processing. Finally, given the potential role of CTNND2 in neuron motility, we used morpholino knockdown in zebrafish embryos to assess its effects on neuronal migration in vivo. Analysis of the zebrafish forebrain revealed a subpopulation of neurons misplaced between the diencephalon and telencephalon. CONCLUSIONS: Taken together, our human genetic and in vivo data suggest that defective migration of subpopulations of neuronal cells due to haploinsufficiency of CTNND2 contribute to the cognitive dysfunction in our patients.
Assuntos
Cateninas/genética , Estudos de Associação Genética , Predisposição Genética para Doença , Deficiência Intelectual/genética , Leitura , Adolescente , Adulto , Sequência de Bases , Criança , Pontos de Quebra do Cromossomo , Cognição , Éxons/genética , Feminino , Loci Gênicos , Proteínas de Fluorescência Verde/metabolismo , Humanos , Íntrons/genética , Masculino , Dados de Sequência Molecular , Mutação/genética , Linhagem , Polimorfismo de Nucleotídeo Único/genética , Análise de Sequência de DNA , Translocação Genética , Substância Branca/patologia , Adulto Jovem , Proteínas de Peixe-Zebra/genética , delta CateninaRESUMO
Alport syndrome is an inherited nephropathy associated with mutations in genes encoding type IV collagen chains present in the glomerular basement membrane. COL4A5 mutations are associated with the major X-linked form of the disease, and COL4A3 and COL4A4 mutations are associated with autosomal recessive and dominant forms (thought to be involved in 15% and 1%-5% of the families, respectively) and benign familial hematuria. Mutation screening of these three large genes is time-consuming and expensive. Here, we carried out a combination of multiplex PCR, amplicon quantification, and next generation sequencing (NGS) analysis of three genes in 101 unrelated patients. We identified 88 mutations and 6 variations of unknown significance on 116 alleles in 83 patients. Two additional indel mutations were found only by secondary Sanger sequencing, but they were easily identified retrospectively with the web-based sequence visualization tool Integrative Genomics Viewer. Altogether, 75 mutations were novel. Sequencing the three genes simultaneously was particularly advantageous as the mode of inheritance could not be determined with certainty in many instances. The proportion of mutations in COL4A3 and COL4A4 was notably high, and the autosomal dominant forms of Alport syndrome appear more frequently than reported previously. Finally, this approach allowed the identification of large COL4A3 and COL4A4 rearrangements not described previously. We conclude that NGS is efficient, reduces screening time and cost, and facilitates the provision of appropriate genetic counseling in Alport syndrome.
Assuntos
Mutação , Nefrite Hereditária/genética , Nefrite Hereditária/patologia , Adolescente , Adulto , Autoantígenos/genética , Criança , Pré-Escolar , Estudos de Coortes , Colágeno Tipo IV/genética , Análise Mutacional de DNA , Saúde da Família , Feminino , Aconselhamento Genético , Heterozigoto , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Masculino , Pessoa de Meia-Idade , Fenótipo , Polimorfismo de Nucleotídeo Único , Adulto JovemRESUMO
BACKGROUND: Point mutations in PDE4D have been recently linked to acrodysostosis, an autosomal dominant disorder with skeletal dysplasia, severe brachydactyly, midfacial hypoplasia and intellectual disability. The purpose of the present study was to investigate clinical and cellular implications of different types of mutations in the PDE4D gene. METHODS: We studied five acrodysostosis patients and three patients with gene dose imbalances involving PDE4D clinically and by whole exome sequencing, Sanger sequencing and array comparative hybridisation. To evaluate the functional consequences of the PDE4D changes, we used overexpression of mutated human PDE4D message and morpholino-based suppression of pde4d in zebrafish. RESULTS: We identified three novel and two previously described PDE4D point mutations in the acrodysostosis patients and two deletions and one duplication involving PDE4D in three patients suffering from an intellectual disability syndrome with low body mass index, long fingers, toes and arms, prominent nose and small chin. When comparing symptoms in patients with missense mutations and gene dose imbalances involving PDE4D, a mirror phenotype was observed. By comparing overexpression of human mutated transcripts with pde4d knockdown in zebrafish embryos, we could successfully assay the pathogenicity of the mutations. CONCLUSIONS: Our findings indicate that haploinsufficiency of PDE4D results in a novel intellectual disability syndrome, the 5q12.1-haploinsufficiency syndrome, with several opposing features compared with acrodysostosis that is caused by dominant negative mutations. In addition, our results expand the spectrum of PDE4D mutations underlying acrodysostosis and indicate that, in contrast to previous reports, patients with PDE4D mutations may have significant hormone resistance with consequent endocrine abnormalities.