Mitomycin C (MMC)-resistant interspecific somatic cell hybrids made between human cells and the MMC-sensitive, Chinese hamster ovary (CHO) excision repair-deficient UV41 cells generally contained human chromosome 16, while other human chromosomes were randomly present. MMC-sensitive and -resistant subclones were isolated from resistant clones, and resistance generally segregated concordantly with human chromosome 16 markers. UV radiation survival analysis of subclones indicated that MMC and UV resistance were correlated. Therefore, the complementing gene, Excision Repair Cross Complementing 4 (ERCC4), was assigned to human chromosome 16. Complementation of UV41 by human cells derived from patients with xeroderma pigmentosum groups A, C, D and F excluded ERCC4 from involvement in those disease syndromes. Resistant hybrids containing only portions of chromosome 16 were identified by the lack of concordance of multiple chromosome 16 markers. When such hybrids were used as a source of probe for fluorescent in situ hybridization onto normal human metaphases, the only region of chromosome 16 identified as being consistently present was 16p13.1-p13.3. Genetic marker analysis of informative hybrids with mapped probes refined the position of ERCC4 to 16p13.13-p13.2 and allowed the following order of markers within the region to be established: pter--(PRM1, D16S215)-D16S213-D16S53-(D16S214,ERCC4) -D16S3-D16S96-cen.
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http://dx.doi.org/10.1093/mutage/8.3.199 | DOI Listing |
Alzheimers Dement
December 2024
Department of Neurosciences, University of California, San Diego, La Jolla, CA, USA.
Background: Increased APP gene dosage is both necessary and sufficient to result in Down Syndrome Alzheimer's Disease (DSAD) in humans and AD-related degenerative changes in mouse models of DS.
Method: We tested antisense oligonucleotides (ASOs) designed to suppress APP expression via RNAseH1-mediated degradation in the Dp(16)1Yey or Dp(16) model of Down Syndrome. Dp(16) is trisomic for human chromosome 21 syntenic regions on murine chromosome 16, containing 115 genes including APP.
Cureus
December 2024
Department of Obstetrics and Gynecology, Royal Medical Services, Amman, JOR.
Ovarian agenesis (OA) is a rare congenital condition characterized by the absence of one or both ovaries, often associated with chromosomal abnormalities, hormonal imbalances, and structural deformities. The condition is frequently diagnosed in females presenting with primary amenorrhea and delayed sexual development. This case report highlights a unique presentation of bilateral ovarian agenesis in a patient with chromosome X translocation, bone modeling disease, and primary amenorrhea.
View Article and Find Full Text PDFNat Genet
January 2025
Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Segmental duplications (SDs) contribute significantly to human disease, evolution and diversity but have been difficult to resolve at the sequence level. We present a population genetics survey of SDs by analyzing 170 human genome assemblies (from 85 samples representing 38 Africans and 47 non-Africans) in which the majority of autosomal SDs are fully resolved using long-read sequence assembly. Excluding the acrocentric short arms and sex chromosomes, we identify 173.
View Article and Find Full Text PDFNat Commun
January 2025
Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD, USA.
The sex chromosomes contain complex, important genes impacting medical phenotypes, but differ from the autosomes in their ploidy and large repetitive regions. To enable technology developers along with research and clinical laboratories to evaluate variant detection on male sex chromosomes X and Y, we create a small variant benchmark set with 111,725 variants for the Genome in a Bottle HG002 reference material. We develop an active evaluation approach to demonstrate the benchmark set reliably identifies errors in challenging genomic regions and across short and long read callsets.
View Article and Find Full Text PDFJ Cell Mol Med
January 2025
Department of Pharmacy, Chongqing Health Center for Women and Children, Women and Children's Hospital of Chongqing Medical University, Chongqing, China.
Ubiquitously transcribed tetratricopeptide repeat on chromosome X (UTX) is a chromatin modifier responsible for regulating the demethylation of histone H3 lysine 27 trimethylation (H3K27me3), which is crucial for human neurodevelopment. To date, the impact of UTX on neurodevelopment remains elusive. Therefore, this study aimed to investigate the potential molecular mechanisms underlying the effects of UTX on neurodevelopment through untargeted metabolomics based on ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS).
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