Congenital adrenal hyperplasia (CAH) is an autosomal recessive disorder that usually results from paternally and maternally transmitted mutations in genes for steroidogenic enzymes. Recent studies on steroid 21-hydroxylase deficiency, the most common form of CAH, have revealed that a small percentage of patients have a non-carrier parent; uniparental disomy (UPD) and de novo mutations were reported as disease-causing mechanisms in these patients. However, it remains unknown whether UPD and de novo mutations underlie other forms of CAH. Here, we report a male patient with steroid 11β-hydroxylase deficiency (11OHD) born to a non-carrier mother. The patient was identified by an elevated 17-hydroxyprogesterone level at a neonatal mass-screening test. His clinical features were comparable to those of previously reported patients with 11OHD. Direct sequencing of CYP11B1 identified a homozygous IVS7+1G>A mutation in the patient, which was not shared by his mother. Comparative genomic hybridization of the patient detected UPD of chromosome 8 [UPD(8)]. Microsatellite analysis indicated non-maternal origin of the UPD(8) and confirmed parentage of other chromosomes. This study shows for the first time that 11OHD can be caused by UPD in the presence of a non-carrier parent. Awareness of such rare cases should improve the accuracy of genetic counseling for families with CAH. Our data support the importance of UPD as an underlying mechanism of autosomal recessive disorders.
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http://dx.doi.org/10.1507/endocrj.ej13-0509 | DOI Listing |
Neurocase
January 2025
Department of Ophthalmology, Affiliated Hospital of Guizhou Medical University, Guiyang, P.R. China.
Background: -related disorders are autosomal recessive genetic disorders characterized by movement disorders primarily including ataxia and spasticity, mainly accompanying developmental delay, seizures, and neuroimaging abnormalities. -related spectrum disorder (VSD) may better reflect the characteristics of the disease. So far, the relationship of genotype and phenotype of VSD has not been established.
View Article and Find Full Text PDFJ Vet Med Sci
January 2025
Department of Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine.
A homozygous individual for ITGB7 gene mutation, an autosomal recessive congenital disorder in Holstein cattle, was retrospectively identified by genotyping of 195 stored blood from patients less than 12 months of age. Other 24 patients (12.3%) showed heterozygous.
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January 2025
Department of Medical Genetics and Center for Rare Diseases, the Second Affiliated Hospital of Zhejiang University School of Medicine, and Zhejiang Key Laboratory of Rare Diseases for Precision Medicine and Clinical Translation, Hangzhou, Zhejiang 310009, China; Nanhu Brain-computer Interface Institute, Hangzhou, Zhejiang 311100, China; MOE Frontier Science Center for Brain Research and Brain-Machine Integration, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310012, China; CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai 200031, China; Lead contact. Electronic address:
Hereditary spastic paraplegias (HSPs) refer to a genetically and clinically heterogeneous group of neurodegenerative disorders characterized by the degeneration of motor neurons. To date, a significant number of patients still have not received a definite genetic diagnosis. Therefore, identifying unreported causative genes continues to be of great importance.
View Article and Find Full Text PDFPLoS Pathog
January 2025
Department of Pathology, Johns Hopkins University, Baltimore, Maryland, United States of America.
Typical epidermodysplasia verruciformis (EV) is a rare, autosomal recessive disorder characterized by an unusual susceptibility to infection with specific skin-trophic types of human papillomavirus, principally betapapillomaviruses, and a propensity for developing malignant skin tumors in sun exposed regions. Its etiology reflects biallelic loss-of-function mutations in TMC6 (EVER1), TMC8 (EVER2) or CIB1. A TMC6-TMC8-CIB1 protein complex in the endoplasmic reticulum is hypothesized to be a restriction factor in keratinocytes for βHPV infection.
View Article and Find Full Text PDFMol Inform
January 2025
Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, 48149, Muenster, Germany.
Primary carnitine deficiency (PCD) is a rare autosomal recessive genetic disorder caused by missense mutations in the SLC22A5 gene encoding the organic carnitine transporter novel type 2 (OCTN2). This study investigates the structural consequences of PCD-causing mutations, focusing on the N32S variant. Using an alpha-fold model, molecular dynamics simulations reveal altered interactions and dynamics suggesting potential mechanistic changes in carnitine transport.
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