Publications by authors named "Leroy Bondhus"

Human inborn errors of immunity include rare disorders entailing functional and quantitative antibody deficiencies due to impaired B cells called the common variable immunodeficiency (CVID) phenotype. Patients with CVID face delayed diagnoses and treatments for 5 to 15 years after symptom onset because the disorders are rare (prevalence of ~1/25,000), and there is extensive heterogeneity in CVID phenotypes, ranging from infections to autoimmunity to inflammatory conditions, overlapping with other more common disorders. The prolonged diagnostic odyssey drives excessive system-wide costs before diagnosis.

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Article Synopsis
  • - Arboleda-Tham Syndrome (ARTHS) is a rare genetic disorder linked to mutations in the KAT6A gene, resulting in symptoms like intellectual disability, developmental delays, and hypotonia, affecting multiple organs.
  • - The study analyzed dermal fibroblasts from ARTHS patients and controls, revealing that about 23% of genes showed different chromatin accessibility and expression, particularly in genes from the HOXC gene cluster, which are vital for early developmental processes.
  • - Additionally, researchers discovered two new disrupted histone modifications (H2A and H3K56 acetylation) in ARTHS, highlighting the complex regulatory roles of KAT6A on gene expression and epigenomic changes
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Arboleda-Tham Syndrome (ARTHS) is a rare genetic disorder caused by heterozygous, truncating mutations in . ARTHS is clinically heterogeneous and characterized by several common features including intellectual disability, developmental and speech delay, hypotonia and affects multiple organ systems. is highly expressed in early development and plays a key role in cell-type specific differentiation.

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Background: Pathogenic mutations in genes that control chromatin function have been implicated in rare genetic syndromes. These chromatin modifiers exhibit extraordinary diversity in the scale of the epigenetic changes they affect, from single basepair modifications by DNMT1 to whole genome structural changes by PRM1/2. Patterns of DNA methylation are related to a diverse set of epigenetic features across this full range of epigenetic scale, making DNA methylation valuable for mapping regions of general epigenetic dysregulation.

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Congenital heart disease (CHD) is a rare structural defect that occurs in ∼1% of live births. Studies on CHD genetic architecture have identified pathogenic single-gene mutations in less than 30% of cases. Single-gene mutations often show incomplete penetrance and variable expressivity.

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The spatial and temporal domain of a gene's expression can range from ubiquitous to highly specific. Quantifying the degree to which this expression is unique to a specific tissue or developmental timepoint can provide insight into the etiology of genetic diseases. However, quantifying specificity remains challenging as measures of specificity are sensitive to similarity between samples in the sample set.

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