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Mutations in the DAX-1 (NROB1) gene result in X-linked congenital adrenal hypoplasia (AHC) and hypogonadotropic hypogonadism. The clinical presentation is usually as adrenal insufficiency in early life, with hypogonadotropic hypogonadism detected at the time of expected puberty. In this study we identified mutations in the DAX-1 gene of two patients with AHC. One mutation, Y399X, resulted in a premature stop codon and was associated with loss of Leydig cell responsiveness to human chorionic gonadotropin. The second, L297P, was a missense mutation, and human chorionic gonadotropin responsiveness was maintained. Kindred analysis established that the mutations had been inherited from the proband's mothers. The L297P has not been described previously and occurs within a highly conserved binding motif (LLXLXL). Transient transfection assays demonstrated that both mutations resulted in a severe loss of DAX-1 repressor activity. Immunohistochemical analysis of testicular tissue obtained from an affected sibling of the subject with the Y399X mutation, who had died with adrenal failure as a neonate, showed normal testicular morphology and expression of DAX-1, steroidogenic factor-1, and anti-Mullerian hormone protein. These data extend the clinical and molecular information on DAX-1 mutations, confirm normal testicular development at the neonatal stage, and illustrate variability in Leydig cell function.
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http://dx.doi.org/10.1210/jc.2002-021560 | DOI Listing |
Neurol Genet
February 2025
Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Kodaira.
Background And Objectives: Becker muscular dystrophy (BMD) is an allelic disorder of Duchenne muscular dystrophy (DMD) in which pathogenic variants in cause progressive worsening of motor dysfunction, muscle weakness and atrophy, and death due to respiratory and cardiac failure. BMD often has in-frame deletions that preserve the amino acid reading frame, but there are some cases with microvariants or duplications. In recent years, the importance of therapeutic development and care for BMD has been emphasized.
View Article and Find Full Text PDFFront Cell Infect Microbiol
December 2024
Servicio de Microbiología, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain.
Introduction: Murepavadin is an antimicrobial peptide (AMP) in clinical development that selectively targets LptD and whose resistance profile remains unknown. We aimed to explore genomic modifications and consequences underlying murepavadin and/or colistin susceptibility.
Methods: To define genomic mechanisms underlying resistance, we performed two approaches: 1) a genome-wide association study (GWAS) in a clinical collection (n=496), considering >0.
Cancer Med
December 2024
Niguarda Hospital, Department of Hematology and Oncology, Milano, Italy.
Background: Despite recurrent and activating mutations, including MYD88, CXCR4, ARID1A, KMT2D, and CD79B were identified, the genetic basis for Waldenström's Macroglobulinemia (WM) and the risk of progression of IgM MGUS to WM remain to be fully elucidated.
Methods: We investigated the mutation status of WM (n = 8), sWM (n = 7), and IgM MGUS (n = 5) patients, by performing high-throughput targeted AmpliSeq NGS on 117 target genes. Specifically, we analyzed the CD19+ cells from 15 WM/sWM patients and five IgM MGUS patients.
IUBMB Life
January 2025
Department of Biology, Pomona College, Claremont, California, USA.
All life depends on accurate and efficient protein synthesis. The aminoacyl-tRNA synthetases (aaRSs) are a family of proteins that play an essential role in protein translation, as they catalyze the esterification reaction that charges a transfer RNA (tRNA) with its cognate amino acid. However, new domains added to the aaRSs over the course of evolution in eukaryotes confer novel functions unrelated to protein translation.
View Article and Find Full Text PDFPlant Physiol
December 2024
Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología (CNB), Consejo Superior de Investigaciones Científicas (CSIC), Madrid 28049, Spain.
The number and distribution of trichomes, i.e., the trichome pattern, in different plant organs shows a conspicuous inter- and intraspecific diversity across Angiosperms that is presumably involved in adaptation to numerous environmental factors.
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