Large Duplications Can Be Benign Copy Number Variants: A Case of a 3.6-Mb Xq21.33 Duplication
CYTOGENETIC AND GENOME RESEARCH
Authors: Maurin, Marie-Laure; Arfeuille, Chloe; Sonigo, Pascale; Rondeau, Sophie; Vekemans, Michel; Turleau, Catherine; Ville, Yves; Malan, Valerie
Abstract
Segmental aneusomies are usually associated with clinical consequences, but an increasing number of nonpathogenic cytogenetically visible as well as large cryptic chromosomal imbalances have been reported. Here, we report a 3.6-Mb Xq21.33 microduplication detected prenatally on a female fetus which was inherited from a phenotypically normal mother and grandfather. It is assumed that male patients harboring Xq or Xp duplication present with syndromic intellectual disability because of functional disomy of the corresponding genes. Female carriers are generally asymptomatic because of preferential inactivation of the abnormal X. In the present case, the 3.6-Mb-duplicated segment encompasses only 2 genes, DIAPH2 and RPL4A. Since the asymptomatic grandfather carries the duplication, we hypothesize that these genes are not dosage sensitive and/or involved in cognitive function. Our observation further illustrates that large copy number variants can be associated with a normal phenotype, especially where gene density is low. Reporting rare cases of large genomic imbalances without a phenotypic effect can be very helpful, especially for genetic counseling in the prenatal setting. (C) 2017 S. Karger AG, Basel
Identification of LPS-inducible genes downregulated by ubiquinone in human THP-1 monocytes
BIOFACTORS
Authors: Schmelzer, Constance; Doering, Frank
Abstract
Coenzyme Q(10) (CoQ(10)) is an obligatory element in the respiratory chain and functions as a potent antioxidant of lipid membranes. More recently, anti-inflammatory effects as well as an impact of CoQ(10) on gene expression have been observed. To reveal putative effects of Q on LPS-induced gene expression, whole genome expression analysis was performed in the monocytic cell line THP-1. Thousand one hundred twenty-nine and 710 probe sets have been identified to be significantly (P <= 0.05) up and downregulated in LPS-treated cells when compared with controls, respectively. Text mining analysis of the top 50 LPS upregulated genes revealed a functional connection in the NF kappa B pathway and confirmed our applied in vitro stimulation model. Moreover, 33 LPS-sensitive genes have been identified to be significantly downregulated by Q(10)-treatment between a factor of 1.32 and 1.85. Gene Ontology (GO) analysis revealed for the Q(10)-sensitve genes a primary involvement in protein metabolism (e.g., HERC1 and EPS15), cell proliferation (e.g., CCDC100 and SMURF1), and transcriptional processes (e.g., CNOT4 and STK4). Three genes were either related to NF kappa B transcription factor activity (ERC1.), cytokinesis (DIAPH2), or modulation of oxidative stress (MSRA). In conclusion, our data provide evidence that Q(10) downregulates LPS-inducible genes in the monocytic cell line THP-1. Thus, the previously described effects of Q(10) on the reduction of proinflammatory mediators might be due to its antioxidant impact on gene expression. (C) 2010 International Union of Biochemistry and Molecular Biology, Inc. Volume 36, Number 3, May/June 2010, Pages 222-228 . E-mail: sek@molprey.uni-kiel.de