Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027947 (neutropenia)
 17,527 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A boy was admitted at the age of 17 months. He had psychomotor retardation in early infancy. Physical examination revealed microcephalus, unusual facies, and a single palmar crease on his right hand, as well as muscle hypotonia in the extremities and hyperextension of the bilateral shoulder and hip joints. Genetic detection identified two pathogenic compound heterozygous mutations, c.8868-1G>A (splicing) and c.11624_11625del (p.V3875Afs*10), in the VPS13B gene, and thus the boy was diagnosed with Cohen syndrome. Cohen syndrome is a rare autosomal recessive disorder caused by the VPS13B gene mutations and has complex clinical manifestations. Its clinical features include microcephalus, unusual facies, neutropenia, and joint hyperextension. VPS13B gene detection helps to make a confirmed diagnosis.
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PMID:[Psychomotor retardation with neutropenia for more than one year in a toddler]. 2997 26

An 11-year-old girl with a history of neutropenia, developmental delay, hypotonia, and intellectual disability was diagnosed with Cohen syndrome after genetic testing discovered homozygous mutation in the VPS13B gene. She was referred to a retinal specialist with a chief complaint of decreased peripheral vision. On examination, decreased visual acuity, pigmentary changes, and nonleaking cystoid macular edema were present in both eyes.
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PMID:Nonleaking cystoid macular edema in Cohen syndrome. 3014 85

Cohen syndrome was initially described as a syndrome including obesity, hypotonia, mental deficiency, and facial, oral, ocular and limb anomalies. Leukopenia, especially neutropenia, was later described as a feature of Cohen syndrome. Cohen syndrome is caused by an autosomal recessive (AR) mutation of the vacuolar protein sorting 13 homolog B (VPS13B, also referred to as COH1) gene on chromosome 8q22.2.
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PMID:Cohen Syndrome: Review of the Literature. 3047 63

Cohen syndrome (CS) is a rare genetic disorder due to mutations in VPS13B gene. Among various clinical and biological features, CS patients suffer from inconsistent neutropenia, which is associated with recurrent but minor infections. We demonstrate here that this neutropenia results from an exaggerate rate of neutrophil apoptosis. Besides this increased cell death, which occurs in the absence of any endoplasmic reticulum stress or defect in neutrophil elastase (ELANE) expression or localization, all neutrophil functions appeared to be normal. We showed a disorganization of the Golgi apparatus in CS neutrophils precursors, that correlates with an altered glycosylation of ICAM-1 in these cells, as evidenced by a migration shift of the protein. Furthermore, a striking decrease in the expression of SERPINB1 gene, which encodes a critical component of neutrophil survival, was detected in CS neutrophils. These abnormalities may account for the excessive apoptosis of neutrophils leading to neutropenia in CS. KEY MESSAGES: Cohen syndrome patients' neutrophils display normal morphology and functions. Cohen syndrome patients' neutrophils have an increased rate of spontaneous apoptosis compared to healthy donors' neutrophils. No ER stress or defective ELA2 expression or glycosylation was observed in Cohen syndrome patients' neutrophils. SerpinB1 expression is significantly decreased in Cohen syndrome neutrophils as well as in VPS13B-deficient cells.
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PMID:Serpin B1 defect and increased apoptosis of neutrophils in Cohen syndrome neutropenia. 3084 84

Cohen syndrome (CS) is a rare autosomal recessive disorder associated with mutations in the vacuolar protein sorting 13 homolog B (VPS13B; formerly COH1) gene. The core clinical phenotype comprises a characteristic facial gestalt, marked developmental delay, and myopia. Additional, nonobligatory features include obesity, microcephaly, short stature, muscular hypotonia, scoliosis, narrow hands and feet, progressive retinopathy, as well as neutropenia. Here we report a novel homozygous nonsense mutation in the VPS13B gene and previously undescribed clinical features in a 19-year-old woman with developmental delay, intellectual disability, and a particular facial appearance. The patient showed several features consistent with CS. In addition, the parents observed congenital alacrima and anhidrosis persisting until onset of puberty. The diagnosis was not established based on the clinical phenotype. We performed whole-genome sequencing and identified a novel homozygous nonsense mutation c.62T>G (NM_152564.4), p.(Leu21*) in the VPS13B gene. Our findings extended the previously reported phenotype of CS. We conclude that transient, prepubertal alacrima and anhidrosis are part of the phenotypic spectrum of CS associated with a novel homozygous nonsense mutation in the VPS13B gene.
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PMID:A novel homozygous nonsense mutation of VPS13B associated with previously unreported features of Cohen syndrome. 3182 61

Cohen syndrome (CS) is an autosomal recessive congenital disorder, characterized by hypotonia, intellectual disability, developmental delay, microcephaly, progressive retinopathy, neutropenia, truncal obesity, joint laxity, characteristic facial, ophthalmic, oral and appendage abnormalities, and an over friendly behavior. It has been linked to mutations in the VPS13B gene. The main purpose of this study was to determine the genetic cause of CS in an Indian family. Whole exome sequencing (WES) was used to identify the genetic cause of CS in the family. The WES analysis identified a homozygous novel duplication mutation c.5272dupG in the VPS13B gene, leading to formation of a truncating protein. The present study will be advantageous in genetic diagnosis and genetic counseling in CS, and increases the mutational spectrum of this gene.
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PMID:Whole Exome Sequencing Identifies a Novel Homozygous Duplication Mutation in the VPS13B Gene in an Indian Family with Cohen Syndrome. 3217 Jul 14

Significant clinical symptoms of Cohen syndrome (CS), a rare autosomal recessive disorder, include intellectual disability, facial dysmorphism, postnatal microcephaly, retinal dystrophy, and intermittent neutropenia. CS has been associated with mutations in the VPS13B (vacuolar protein sorting 13 homolog B) gene, which regulates vesicle-mediated protein sorting and transport; however, the cellular mechanism underlying CS pathogenesis in patient-derived neurons remains uncertain. This report states that autophagic vacuoles accumulate in CS fibroblasts and the axonal terminals of CS patient-specific induced pluripotent stem cells (CS iPSC)-derived neurons; additionally, autophagic flux was significantly increased in CS-derived neurons compared to control neurons. VPS13B knockout HeLa cell lines generated using the CRISPR/Cas9 genome editing system showed significant upregulation of autophagic flux, indicating that VSP13B may be associated with autophagy in CS. Transcriptomic analysis focusing on the autophagy pathway revealed that genes associated with autophagosome organization were dysregulated in CS-derived neurons. ATG4C is a mammalian ATG4 paralog and a crucial regulatory component of the autophagosome biogenesis/recycling pathway. ATG4C was significantly upregulated in CS-derived neurons, indicating that autophagy is upregulated in CS neurons. The autophagy pathway in CS neurons may be associated with the pathophysiology exhibited in the neural network of CS patients.
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PMID:Autophagy pathway upregulation in a human iPSC-derived neuronal model of Cohen syndrome with VPS13B missense mutations. 3237


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