Project description:We saw a patient who presented with respiratory distress from birth due to interstitial lung disease. Before the age of three months a diagnosis of nephrotic syndrome was made. Lung biopsy revealed pulmonary interstitial glycogenosis. Despite extensive investigations, no known genetic or infectious cause was found for the congenital nephrotic syndrome. The patient died at the age of 8 months due to respiratory failure. A 20 Mb homozygous region was identified on chromosome 17 in the patient’s DNA, revealing a novel homozygous missense variant in ITGA3 gene.
Project description:Wolfram syndrome is a rare genetic disorder largely caused by pathogenic variants in the WFS1 gene and manifested by diabetes mellitus, optic nerve atrophy, and progressive neurodegeneration. Recent genetic and clinical findings have revealed Wolfram syndrome as a spectrum disorder. Therefore, a genotype-phenotype correlation analysis is needed for diagnosis and therapeutic development. Here, we focus on the WFS1 c.1672C>T, p.R558C variant which is highly prevalent in the Ashkenazi-Jewish population. Clinical investigation indicates that subjects carrying the homozygous WFS1 c.1672C>T, p.R558C variant show mild forms of Wolfram syndrome phenotypes. Expression of WFS1 p.R558C is more stable compared to the other known recessive pathogenic variants associated with Wolfram syndrome. Human induced pluripotent stem cell (iPSC)-derived islets (SC-islets) homozygous for WFS1 c.1672C>T variant recapitulate genotype-related Wolfram syndrome phenotypes. Enhancing residual WFS1 function by a combination treatment of chemical chaperones mitigates detrimental effects caused by the WFS1 c.1672C>T, p.R558C variant and increases insulin secretion in SC-islets. Thus, the WFS1 c.1672C>T, p.R558C variant causes a mild form of Wolfram syndrome phenotypes, which can be remitted with a combination treatment of chemical chaperones. We demonstrate that our patient iPSC-derived disease model provides a valuable platform for further genotype-phenotype analysis and therapeutic development for Wolfram syndrome.
Project description:In this study, we sought to extend knowledge of lymphocyte development by studying patients with classical Omenn syndrome or T-B- SCID. to gain further insight into pathomechanism, we undertook single cell studies of cryopreserved peripheral blood mononuclear cells from patients with Omenn syndrome associated with either the NUDCD3 variant (3 patients/3 samples), or pathogenic defects of RAG1 (6 patients/6 samples) or RAG2 (2 patients/2samples), and healthy controls (2 samples) for comparison.
Project description:The 22q11.2 deletion syndrome (22q11.2DS) is the most common copy number variant (CNV)-associated syndrome, leading to congenital and neuropsychiatric anomalies. Patient-derived, induced pluripotent stem cell (iPS) models have provided important insight into the mechanisms of phenotypic features of this condition. However, patient-derived iPSC models may harbor underlying genetic heterogeneity that can confound analysis of pathogenic CNV effects. Furthermore, the ~1.5 Mb “A-B” deletion at this locus is inherited at higher frequency than the more common ~2.7 Mb “A-D” deletion, but remains under-studied due to lack of relevant models. To address these issues, here we leveraged a CRISPR-based strategy in Cas9-expressing iPS cells to engineer novel isogenic models of the 22q11.2 “A-B” deletion. After in vitro differentiation to excitatory neurons, integrated transcriptomic and cell surface proteomics identified deletion-associated alterations in surface adhesion markers. Furthermore, implantation of iPS-derived neuronal progenitor cells into the cortex of neonatal mice found decreased proliferation and accelerated neuronal maturation within a relevant microenvironment. Taken together, our results suggest potential pathogenic mechanisms of the 22q11.2 “A-B” deletion in driving neuronal and neurodevelopmental phenotypes. We further propose that the isogenic models generated here will provide a unique resource to study this less-common variant of the 22q11.2 microdeletion syndrome.
Project description:The analysis of transcriptional profiles of cybrid cells harbouring two pathogenic mtDNA variants associated with Leigh syndrome i.e., m.9185T>C in the mt-ATP6 gene and m.13513G>A in the mt-ND5 gene, in comparison to cybrid cells harbouring control mtDNA haplogroups or the wt m.13513G variant.
Project description:Myxomatous valve disease is the most common form of heart valve disease leading to morbidity and mortality worldwide. It is primarily associated with inherited connective tissue disorders caused by genetic variants in extracellular matrix genes such as Marfan syndrome. Mice with Fibrillin 1 gene variant Fbn1 C1039G/+ recapitulate histopathological features of Marfan syndrome. However, the cell heterogeneity and changes of gene expression at single cell level in Marfan syndrome valves are completed unknown.
2024-10-15 | GSE261874 | GEO
Project description:Thrombocytopenia Microcephaly Syndrome - a novel phenotype associated with ACTB mutations