Yazar "Tuysuz, Beyhan" seçeneğine göre listele
Listeleniyor 1 - 11 / 11
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Clinical characteristics and response to growth hormone treatment in patients with Prader-Willi Syndrome(Karger, 2019) Evliyaoglu, Olcay; Cakir, Aydilek Dagdeviren; Bas, Firdevs; Akin, Onur; Siklar, Zeynep; Ozcabi, Bahar; Berberoglu, Merih; Kardelen, Asli Derya; Bayramoglu, Elvan; Poyrazoglu, Sukran; Aydin, Murat; Turel, Ayca Ergul; Goksen, Damla; Bolu, Semih; Aycan, Zehra; Tuysuz, Beyhan; Ercan, OyaÖğe Clinical features of generalized lipodystrophy in Turkey: A cohort analysis(Wiley, 2023) Yildirim Simsir, Ilgin; Tuysuz, Beyhan; Ozbek, Mehmet Nuri; Tanrikulu, Seher; Celik Guler, Merve; Karhan, Asuman Nur; Denkboy Ongen, YaseminAim: To describe the Turkish generalized lipodystrophy (GL) cohort with the frequency of each complication and the death rate during the period of the follow-up. Methods: This study reports on 72 patients with GL (47 families) registered at different centres in Turkey that cover all regions of the country. The mean +/- SD follow-up was 86 +/- 78 months. Results: The Kaplan-Meier estimate of the median time to diagnosis of diabetes and/or prediabetes was 16 years. Hyperglycaemia was not controlled in 37 of 45 patients (82.2%) with diabetes. Hypertriglyceridaemia developed in 65 patients (90.3%). The Kaplan-Meier estimate of the median time to diagnosis of hypertriglyceridaemia was 14 years. Hypertriglyceridaemia was severe (>= 500 mg/dl) in 38 patients (52.8%). Seven (9.7%) patients suffered from pancreatitis. The Kaplan-Meier estimate of the median time to diagnosis of hepatic steatosis was 15 years. Liver disease progressed to cirrhosis in nine patients (12.5%). Liver disease was more severe in congenital lipodystrophy type 2 (CGL2). Proteinuric chronic kidney disease (CKD) developed in 32 patients (44.4%) and cardiac disease in 23 patients (31.9%). Kaplan-Meier estimates of the median time to diagnosis of CKD and cardiac disease were 25 and 45 years, respectively. Females appeared to have a more severe metabolic disease, with an earlier onset of metabolic abnormalities. Ten patients died during the follow-up period. Causes of death were end-stage renal disease, sepsis (because of recurrent intestinal perforations, coronavirus disease, diabetic foot infection and following coronary artery bypass graft surgery), myocardial infarction, heart failure because of dilated cardiomyopathy, stroke, liver complications and angiosarcoma. Conclusions: Standard treatment approaches have only a limited impact and do not prevent the development of severe metabolic abnormalities and early onset of organ complications in GL.Öğe The clinical phenotype of Koolen-de Vries syndrome in Turkish patients and literature review(Wiley, 2023) Karamik, Gokcen; Tuysuz, Beyhan; Isik, Esra; Yilmaz, Aysegul; Alanay, Yasemin; Sunamak, Evrim Cifci; Durmusalioglu, Enise AvciKoolen-de Vries syndrome (KdVS) is a rare multisystemic disorder caused by a microdeletion on chromosome 17q21.31 including KANSL1 gene or intragenic pathogenic variants in KANSL1 gene. Here, we describe the clinical and genetic spectrum of eight Turkish children with KdVS due to a de novo 17q21.31 deletion, and report on several rare/new conditions. Eight patients from unrelated families aged between 17 months and 19 years enrolled in this study. All patients evaluated by a clinical geneticist, and the clinical diagnosis were confirmed by molecular karyotyping. KdVS patients had some common distinctive facial features. All patients had neuromotor retardation, and speech and language delay. Epilepsy, structural brain anomalies, ocular, ectodermal, and musculoskeletal findings, and friendly personality were remarkable in more than half of the patients. Hypertension, hypothyroidism, celiac disease, and postaxial polydactyly were among the rare/new conditions. Our study contributes to the clinical spectrum of patients with KdVS, while also provide a review by comparing them with previous cohort studies.Öğe Congenital generalized lipodystrophy: the evaluation of clinical follow-up findings in a series of five patients with type 1 and two patients with type 4(Elsevier, 2020) Gunes, Nilay; Kutlu, Tufan; Tekant, Gonca Topuzlu; Eroglu, Ayse Guler; Ustundag, Nil Comunoglu; Ozturk, Birol; Tuysuz, BeyhanCongenital generalized lipodystrophy (CGL) is a rare disorder characterized by lipoatrophy affecting the face, limbs and trunk, acromegaloid features, hepatomegaly, hypertriglyceridemia, and insulin resistance. the aim of this study is to evaluate the long-term follow-up findings including gastrointestinal and cardiac manifestations of the patients with CGL1 and CGL4, caused by mutations in the AGPAT2 and CAVIN1 genes, respectively. Two patients aged 2 and 9 years with the same biallelic CAVIN1 mutation and five patients aged between 6 months and 11 years 4 months with AGPAT2 mutations have been followed up for 3-9 years. the patients were between 7 and 20 years of age at their last examination. One of the two patients with CGL4 had congenital pyloric stenosis. the other patient with CGL4 have developed recurrent duodenal perforations which have not been reported in CGL patients previously. the pathological examination of duodenal specimens revealed increased subserosal fibrous tissue and absent submucosal adipose tissue. None of the five CGL1 patients had gastrointestinal problems. Two patients with CGL4 developed hypertrophic cardiomyopathy (HCMP) and severe cardiac arrhythmia, only one patient with CGL1 had HCMP. Hyperinsulinemia was detected in one patient with CGL4 and three patients with CGL1, these three CGL1 patients also had acanthosis nigricans. Hepatic steatosis was detected in one patient with CGL4 and two patients with CGL1 by ultrasonography. in conclusion, these findings suggest that CGL4 patients should also be carefully followed up for gastrointestinal and cardiac manifestations.Öğe First Genetic Screening for Maternal Uniparental Disomy of Chromosome 7 in Turkish Silver-Russell Syndrome Patients(Iranian Scientific Society Medical Entomology, 2012) Karaca, Emin; Tuysuz, Beyhan; Pehlivan, Sacide; Özkınay, FerdaObjective: Silver-Russell syndrome (SRS) is a clinically and genetically heterogeneous syndrome which is characterized by severe intrauterine and postnatal growth retardation, and typical characteristic facial dysmorphisms. It has been associated with maternal uniparental disomy (UPD) for chromosome 7 and hypomethylation of imprinting control region 1 (IGF2/H19) in 11p15. UPD refers to the situation in which both copies of a chromosome pair have originated from one parent. UPD can be presented both as partial heterodisomy and isodisomy. The aim of this study was to determine the maternal UPD7 (matUPD7) in 13 Turkish SRS patients. Methods: Genotyping for matUPD7 was performed with microsatellite markers by polymerase chain reaction. Findings: The maternal UPD7 including the entire chromosome was identified in 1/13 (7.6 %) of individuals within SRS patients. There were no significant differences between clinical features of matUPD7 case and other SRS cases except congenital heart defects. Conclusion: It is often difficult to establish diagnosis of a child with intrauterine growth retardation (IUGR), growth failure and dysmorphic features. Thus, screening for matUPD7 in IUGR children with growth failure and mild SRS features might be a valuable diagnostic tool.Öğe Mucolipidosis type III gamma: Three novel mutation and genotype phenotype study in eleven patients(Elsevier Science Bv, 2018) Tuysuz, Beyhan; Kasapcopur, Ozgur; Alkaya, Dilek Uludag; Sahin, Sezgin; Sozeri, Betul; Yesil, GozdeMucolipidosis type III gamma (MLIII gamma) is a lysosomal storage disease characterized by joint stiffness, mild coarse face and corneal clouding, which becomes recognizable usually in childhood. Biallelic mutations in the GNPTG gene, which encode the gamma subunit of the N-acetylglucosamine-1-phosphotransferase enzyme, are the underlying cause of MLIII gamma. The aim of this study is to evaluate the longitudinal findings and genotype of eleven patients from eight families with MLIII gamma and to establish a genotype-phenotype correlation. The most frequently observed initial finding was stiffness of finger joints, which detected in patients between 18 month-olds and five year-olds. However, in four patients presented here, initial finding was knee pain or waddling gait, which started between six-16 years of age. All patients also had variable degrees of stiffness on large joints. The longest follow up period was 16 years while the shortest was three years and six months. We observed that the patients who had an early onset disease and severe joint stiffness had also rapidly progressive joint involvement mostly localized in hands, shoulders, and hip. However; the patients with late onset and/or mild joint stiffness experienced slowly progressive symptoms. Most patients dropped in their growth curve in time and the ones who-were severely affected reached the final height below the third centile. Seven disease causing mutations, three of them novel, were detected in GNPTG gene. According to our clinical observations c.493_494insC and c.283_284insC mutations lead to a severe phenotype and c.196C > T, c.347349del, c.652_655delTACT and c.445delG/c.367A > G mutations seemed to generate a milder phenotype.Öğe Natural history and genetic spectrum of the Turkish metaphyseal dysplasia cohort, including rare types caused by biallelic COL10A1, COL2A1, and LBR variants(Elsevier Science Inc, 2023) Tuysuz, Beyhan; Kasap, Busra; Saritas, Merve; Alkaya, Dilek Uludag; Bozlak, Serdar; Kiykim, Ayca; Durmaz, AsudeBackground: Metaphyseal chondrodysplasias are a heterogeneous group of diseases characterized by short and bowed long bones and metaphyseal abnormality. The aim of this study is to investigate the genetic etiology and prognostic findings in patients with metaphyseal dysplasia.Methods: Twenty-four Turkish patients were included in this study and 13 of them were followed for 2-21 years. COL10A1, RMRP sequencing and whole exome sequencing were performed.Results: Results: Seven heterozygous pathogenic variants in COL10A1 were detected in 17 patients with Schmid type metaphyseal chondrodysplasia(MCDS). The phenotype was more severe in patients with heterozygous missense variants (one in signal peptide domain at the N-terminus of the protein, the other, class-1 group mu-tation at NC1 domain) compared to the patients with truncating variants. Short stature and coxa vara deformity appeared after 3 and 5 years of age, respectively, while large femoral head resolved after the age of 13 years MCDS group. Interestingly, one patient with severe phenotype also had a biallelic missense variant in NC1 domain of COL10A1. Three patients with biallelic mutations in RMRP had prenatal onset short stature with short limb, and typical findings of cartilage hair hypoplasia (CHH). While immunodeficiency or recurrent infections were not observed, resistant congenital anemia was detected in one. Biallelic mutation in LBR was described in patient with prenatal onset short stature, short and curved limb and metaphyseal abnormalities. Unlike previ-ously reported patients, this patient had ectodermal findings, similar to CHH. A biallelic COL2A1 mutation was also found in the patient with lower limb deformities and metaphyseal involvement without vertebral and epiphyseal changes.Conclusion: Long-term clinical characteristics are presented in a metaphyseal dysplasia cohort, including rare types caused by biallelic COL10A1, COL2A1, and LBR variants. We also point out that the domains where mu-tations on COL10A1 take place are important in the genotype-phenotype relationship.Öğe Natural History of Congenital Generalized Lipodystrophy: A Nationwide Study From Turkey(Oxford Univ Press Inc, 2016) Akinci, Bans; Onay, Huseyin; Demir, Tevfik; Ozen, Samim; Kayserili, Hulya; Akinci, Gulcin; Nur, Banu; Tuysuz, Beyhan; Ozbek, Mehmet Nun; Gungor, Adem; Simsir, Ilgin Yildirim; Altay, Canan; Demir, Leyla; Simsek, Enver; Atmaca, Murat; Topaloglu, Haluk; Bilen, Habib; Atmaca, Hulusi; Atik, Tahir; Cavdar, Umit; Altunoglu, Umut; Aslanger, Ayca; Mihci, Ercan; Secil, Mustafa; Saygili, Fusun; Comlekci, Abdurrahman; Garg, AbhimanyuContext: Congenital generalized lipodystrophy (CGL) is a rare autosomal recessive disorder characterized by near-total lack of body fat. Objective: We aimed to study natural history and disease burden of various subtypes of CGL. Design: We attempted to ascertain nearly all patients with CGL in Turkey. Setting: This was a nationwide study. Patients or Other Participants: Participants included 33 patients (22 families) with CGL and 30 healthy controls. Main Outcome Measure(s): We wanted to ascertain genotypes by sequencing of the known genes. Whole-body magnetic resonance imaging was used to investigate the extent of fat loss. Metabolic abnormalities and end-organ complications were measured on prospective follow-up. Results: Analysis of the AGPAT2 gene revealed four previously reported and four novel mutations (CGL1; c.144C>A, c.667_705delinsCTGCG, c.268delC, and c.316 + 1G > T). Analysis of the BSCL2 gene revealed four different homozygous and one compound heterozygous possible disease-causing mutations (CGL2), including four novel mutations (c.280C > T, c. 631delG, c. 62A > T, and c. 465-468delGACT). Two homozygous PTRF mutations (c.481-482insGTGA and c. 259C > T) were identified (CGL4). Patients with CGL1 had preservation of adipose tissue in the palms, soles, scalp, and orbital region, and had relatively lower serum adiponectin levels as compared to CGL2 patients. CGL4 patients had myopathy and other distinct clinical features. All patients developed various metabolic abnormalities associated with insulin resistance. Hepatic involvement was more severe in CGL2. End-organ complications were observed at young ages. Two patients died at age 62 years from cardiovascular events. Conclusions: CGL patients from Turkey had both previously reported and novel mutations of the AGPAT2, BSCL2, and PTRF genes. Our study highlights the early onset of severe metabolic abnormalities and increased risk of end-organ complications in patients with CGL.Öğe The prevalance of 22q11.2 deletion in children with congenital heart disease and dismorphic features(Springer, 2007) Kaya; Cankaya, Tufan; Yilmaz, Elif; Oztunc, Funda; Tuysuz, BeyhanÖğe Specific early signs and long-term follow-up findings of progressive pseudorheumatoid dysplasia (PPRD) in the Turkish cohort(Oxford Univ Press, 2022) Alkaya, Dilek Uludag; Kasapcopur, Ozgur; Bursali, Aysegul; Adrovic, Amra; Demir, Bilal; Aykut, Ayca; Tuysuz, BeyhanObjectives Progressive pseudorheumatoid dysplasia (PPRD) is a spondyloepiphyseal dysplasia caused by biallelic variants in CCN6. This study aimed to describe the early signs and follow-up findings in 44 Turkish PPRD patients. Methods The patients with progressive stiffness of multiple joints, characteristic wide metaphysis of interphalangeal (IP) joints and platyspondyly were clinically diagnosed with PPRD. Fifteen patients who had first symptoms under 3 years of age were grouped as early-onset, while others were grouped as classical. CCN6 sequencing was performed in 43 patients. Results Thirteen pathogenic/likely pathogenic variants were identified, five were novel. c.156C>A(p.Cys52*) variant was found in 53.3% of the families. The initial symptom in the early-onset group was genu varum deformity, while it was widening of IP joints in the classical group. The median age of onset of symptoms and of diagnosis was 4 and 9.7 years, respectively. The mean follow-up duration was 5.6 years. The median age of onset of IP, elbow, knee and hip stiffness, which became progressive with growth was 5, 9, 9 and 12.2 years, respectively. Waddling gait occurred in 97.7% of the patients. A total of 47.7% lost independent walking ability at the median age of 12 years. In the early-onset group, waddling gait occurred earlier than in classical group (P < 0.001). Two patients had atypical presentation with late-onset and mild or lack of IP involvement. Conclusion We observed that genu varum deformity before the age of 3 years was an early sign for PPRD and almost half of the patients lost walking ability at the median age of 12 years.Öğe Whole-exome sequencing identifies recessive WDR62 mutations in severe brain malformations(Nature Publishing Group, 2010) Bilguvar, Kaya; Ozturk, Ali Kemal; Louvi, Angeliki; Kwan, Kenneth Y.; Choi, Murim; Tatli, Burak; Yalnizoglu, Dilek; Tuysuz, Beyhan; Caglayan, Ahmet Okay; Gokben, Sarenur; Kaymakcalan, Hande; Barak, Tanyeri; Bakircioglu, Mehmet; Yasuno, Katsuhito; Ho, Winson; Sanders, Stephan; Zhu, Ying; Yilmaz, Sanem; Dincer, Alp; Johnson, Michele H.; Bronen, Richard A.; Kocer, Naci; Per, Hueseyin; Mane, Shrikant; Pamir, Mehmet Necmettin; Yalcinkaya, Cengiz; Kumandas, Sefer; Topcu, Meral; Ozmen, Meral; Sestan, Nenad; Lifton, Richard P.; State, Matthew W.; Gunel, MuratThe development of the human cerebral cortex is an orchestrated process involving the generation of neural progenitors in the periventricular germinal zones, cell proliferation characterized by symmetric and asymmetric mitoses, followed by migration of post-mitotic neurons to their final destinations in six highly ordered, functionally specialized layers(1,2). An understanding of the molecular mechanisms guiding these intricate processes is in its infancy, substantially driven by the discovery of rare mutations that cause malformations of cortical development(3-6). Mapping of disease loci in putative Mendelian forms of malformations of cortical development has been hindered by marked locus heterogeneity, small kindred sizes and diagnostic classifications that may not reflect molecular pathogenesis. Here we demonstrate the use of whole-exome sequencing to overcome these obstacles by identifying recessive mutations in WD repeat domain 62 (WDR62) as the cause of a wide spectrum of severe cerebral cortical malformations including microcephaly, pachygyria with cortical thickening as well as hypoplasia of the corpus callosum. Some patients with mutations in WDR62 had evidence of additional abnormalities including lissencephaly, schizencephaly, polymicrogyria and, in one instance, cerebellar hypoplasia, all traits traditionally regarded as distinct entities. In mice and humans, WDR62 transcripts and protein are enriched in neural progenitors within the ventricular and subventricular zones. Expression of WDR62 in the neocortex is transient, spanning the period of embryonic neurogenesis. Unlike other known microcephaly genes, WDR62 does not apparently associate with centrosomes and is predominantly nuclear in localization. These findings unify previously disparate aspects of cerebral cortical development and highlight the use of whole-exome sequencing to identify disease loci in settings in which traditional methods have proved challenging.
