Istanbul University

About: Istanbul University is a education organization based out in Istanbul, Turkey. It is known for research contribution in the topics: Population & Medicine. The organization has 19050 authors who have published 38464 publications receiving 727640 citations. The organization is also known as: İstanbul Üniversitesi & University of Istanbul.

MYO1E Mutations and Childhood Familial Focal Segmental Glomerulosclerosis

Abstract: A B S T R AC T Background Focal segmental glomerulosclerosis is a kidney disease that is manifested as the nephrotic syndrome. It is often resistant to glucocorticoid therapy and progresses to endstage renal disease in 50 to 70% of patients. Genetic studies have shown that familial focal segmental glomerulosclerosis is a disease of the podocytes, which are major components of the glomerular filtration barrier. However, the molecular cause in over half the cases of primary focal segmental glomerulosclerosis is unknown, and effective treatments have been elusive. Methods We performed whole-genome linkage analysis followed by high-throughput sequencing of the positive-linkage area in a family with autosomal recessive focal segmental glomerulosclerosis (index family) and sequenced a newly discovered gene in 52 unrelated patients with focal segmental glomerulosclerosis. Immunohistochemical studies were performed on human kidney-biopsy specimens and cultured podocytes. Expression studies in vitro were performed to characterize the functional consequences of the mutations identified. Results We identified two mutations (A159P and Y695X) in MYO1E, which encodes a nonmuscle class I myosin, myosin 1E (Myo1E). The mutations in MYO1E segregated with focal segmental glomerulosclerosis in two independent pedigrees (the index family and Family 2). Patients were homozygous for the mutations and did not have a response to glucocorticoid therapy. Electron microscopy showed thickening and disorganization of the glomerular basement membrane. Normal expression of Myo1E was documented in control human kidney-biopsy specimens in vivo and in glomerular podocytes in vitro. Transfection studies revealed abnormal subcellular localization and function of the A159P-Myo1E mutant. The Y695X mutation causes loss of calmodulin binding and of the tail domains of Myo1E. Conclusions MYO1E mutations are associated with childhood-onset, glucocorticoid-resistant focal segmental glomerulosclerosis. Our data provide evidence of a role of Myo1E in podocyte function and the consequent integrity of the glomerular filtration barrier.

Behçet's disease and the nervous system.

Abstract: Behcet's disease is a multisystem inflammatory disorder with unknown aetiology. It is a disease of young adults with a more severe course in males subjects. Its prevalence is high in the Mediterranean basin and Japan and has been linked with human leucocyte antigen B5 (HLA-B5) in those countries. According to the diagnostic criteria formed by the International Study Group, recurrent oral ulceration is a prerequisite, with two more typical symptoms or signs. Neurological involvement is one of the most devastating manifestations of Behcet's disease. The involvement is either caused by primary neural parenchymal lesions (neuro-Behcet) or secondary to major vascular involvement (vasculo Behcet). The course is relapsing-remitting, secondary progressive or primary progressive. The most commonly involved area is the brain stem, with additional symptoms or signs, hemispherical involvement with mental changes being the most common. Intracranial hypertension, usually owing to dural sinus thrombosis, has a special place in Behcet's disease. The most common clinical findings are pyramidal signs. Sensory symptoms or signs are much less frequent, and hemianopia and higher cortical function disturbances as well as pure cerebellar syndrome are rare features. Cerebrospinal fluid usually has a high protein content and/or pleocytosis. Notably, in the acute period most patients have lesions shown by magnetic resonance imaging (MRI) extending from the brain-stem to diencephalic structures. Differential diagnosis from multiple sclerosis can be difficult in patients with hemispheric white matter MRI hyperintensities. Immunosuppressives are used in treatment.

Diagnosis and management of Neuro-Behcet's disease: international consensus recommendations.

Abstract: Neuro-Behcet’s disease (NBD) is one of the more serious manifestations of Behcet’s disease (BD), which is a relapsing inflammatory multisystem disease with an interesting epidemiology. Though NBD is relatively uncommon, being potentially treatable, neurologists need to consider it in the differential diagnosis of inflammatory, infective, or demyelinating CNS disorders. Evidence-based information on key issues of NBD diagnosis and management is scarce, and planning for such studies is challenging. We therefore initiated this project to develop expert consensus recommendations that might be helpful to neurologists and other clinicians, created through an extensive literature review and wide consultations with an international advisory panel, followed by a Delphi exercise. We agreed on consensus criteria for the diagnosis of NBD with two levels of certainty in addition to recommendations on when to consider NBD in a neurological patient, and on the use of various paraclinical tests. The management recommendations included treatment of the parenchymal NBD and cerebral venous thrombosis, the use of disease modifying therapies, prognostic factors, outcome measures, and headache in BD. Future studies are needed to validate the proposed criteria and provide evidence-based treatments.