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Du J, Li L, Fu D. Whole-exome-based single nucleotide variants and copy number analysis for prenatal diagnosis of compound heterozygosity of SMPD4. Psychiatr Genet 2024; 34:74-80. [PMID: 38690959 DOI: 10.1097/ypg.0000000000000369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
BACKGROUND Biallelic loss-of-function variants in SMPD4 cause a rare and severe neurodevelopmental disorder. These variants have been identified in a group of children with neurodevelopmental disorders with microcephaly, arthrogryposis, and structural brain anomalies. SMPD4 encodes a sphingomyelinase that hydrolyzes sphingomyelin into ceramide at neutral pH and can thereby affect membrane lipid homeostasis. SMPD4 localizes to the membranes of the endoplasmic reticulum and nuclear envelope and interacts with nuclear pore complexes. MATERIALS AND METHODS For the efficient prenatal diagnosis of rare and undiagnosed diseases, the parallel detection of copy number variants (CNVs) and single nucleotide variants using whole-exome analysis is required. A physical examination of the parents was performed. Karyotype and whole-exome analysis were performed for the fetus and the parents. RESULTS A fetus with microcephaly and arthrogryposis; biallelic null variants (c.387-1G>A; Chr2[GRCh38]: g.130142742_130202459del) were detected by whole-exome sequencing (WES). We have reported for the first time the biallelic loss-of-function mutations in SMPD4 in patients born to unrelated parents in China. CONCLUSION WES could replace chromosomal microarray analysis and copy number variation sequencing as a more cost-effective genetic test for detecting CNVs and diagnosing highly heterogeneous conditions.
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Affiliation(s)
| | - Lin Li
- Department of Ultrasound, Renmin Hospital, Hubei University of Medicine, Shiyan, People's Republic of China
| | - Dinghu Fu
- Department of Ultrasound, Renmin Hospital, Hubei University of Medicine, Shiyan, People's Republic of China
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Wu J, Mei X, Zhan X, Liu F, Liu D. Proximity hybridization based "turn-on" DNA tweezers for accurate and enzyme-free small extracellular vesicle analysis. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024. [PMID: 38699853 DOI: 10.1039/d4ay00487f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Small extracellular vesicles (sEVs) are a type of extracellular vesicle that carries many types of molecular information. The identification of sEVs is essential for the non-invasive detection and treatment of illnesses. Hence, there is a significant need for the development of simple, sensitive, and precise methods for sEV detection. Herein, a DNA tweezers-based assay utilizing a "turn-on" mechanism and proximity ligation was suggested for the efficient and rapid detection of sEVs through amplified fluorescence. The target facilitates the proximity combination of the C1 probe and C2 probe, resulting in the formation of a complete extended sequence. The elongated sequence can cyclically initiate the hairpin probe (HP), leading to the activation of DNA tweezers. An excellent linear correlation was achieved, with a limit of detection of 57 particles per μL. Furthermore, it has been effectively employed to analyze sEVs under intricate experimental conditions, demonstrating a promising and pragmatic prospect for future applications. Given that the identification of sEVs was successfully accomplished using a single-step method that exhibited exceptional sensitivity and strong resistance to interference, the proposed technique has the potential to provide a beneficial platform for accurate recognition of sEVs and early detection of diseases.
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Affiliation(s)
- Jinlin Wu
- Department of Endocrinology, The Second Affiliated Hospital, Chongqing Medical University, No. 74 Linjiang Road, Yuzhong District, Chongqing, 400010, China.
- Department of Endocrinology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing, 400021, China
| | - Xi Mei
- Department of Endocrinology, The Second Affiliated Hospital, Chongqing Medical University, No. 74 Linjiang Road, Yuzhong District, Chongqing, 400010, China.
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, 610500, China
| | - Xiaoqin Zhan
- Department of Clinical Laboratory, Chongqing Hospital of Traditional Chinese Medicine, Chongqing, 400021, China
- Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, Chongqing Hospital of Traditional Chinese Medicine, Chongqing, 400021, China
| | - Fang Liu
- Department of Endocrinology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing, 400021, China
| | - Dongfang Liu
- Department of Endocrinology, The Second Affiliated Hospital, Chongqing Medical University, No. 74 Linjiang Road, Yuzhong District, Chongqing, 400010, China.
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Theresia KJ, Wolfgang H, Gundula G, Michael E, Alexander W, Caroline G, Laura F, Rabih C, Heinz-Peter G. Prenatal diagnosis of SMPD4 loss - A neurodevelopmental disorder with microcephaly, arthrogryposis and structural brain anomalies. Prenat Diagn 2023; 43:284-287. [PMID: 36703249 DOI: 10.1002/pd.6324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 01/28/2023]
Abstract
SMPD4 loss is a rare neurodevelopmental disorder that leads to severe mental and physical disability and early death in infancy. Most cases of this genetic condition have been diagnosed postnatally. This article focuses on the prenatal findings of affected fetuses. The phenotypes can include growth restriction, arthrogryposis (clenched hands, foot deformity), as well as cerebral abnormalities (simplified gyral pattern/lissencephaly, cerebellar hypoplasia, corpus callosum deformity). SMPD4 loss is detectable via exome sequencing. Here, two fetuses displayed a homozygotic pathogen variant in the SMPD4 gene, encoding for the enzyme Sphingomyelinase-4. Both parents were heterozygous carriers of the pathogenic variant. On detection of the above mentioned signs exome sequencing is indicated, with focus on the SMPD4 gene.
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Affiliation(s)
- Koenigbauer Josefine Theresia
- Department of Obstetrics, Charité University Hospital, Berlin, Germany.,Prenatal Diagnosis Bergmannstrasse, Berlin, Germany
| | - Henrich Wolfgang
- Department of Obstetrics, Charité University Hospital, Berlin, Germany
| | | | - Entezami Michael
- Zentrum für Pränataldiagnostik und Humangenetik, Berlin, Germany
| | | | - Gabrysch Caroline
- Department of Obstetrics, Charité University Hospital, Berlin, Germany
| | - Fangmann Laura
- Department of Obstetrics, Charité University Hospital, Berlin, Germany
| | - Chaoui Rabih
- Center for Prenatal Diagnosis and Human Genetics, Berlin, Germany
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Antonin W, Siniossoglou S. Nuclear Shape-Shifters: Lipid and Protein Dynamics at the Nuclear Envelope. Cells 2022; 11:cells11244120. [PMID: 36552884 PMCID: PMC9776944 DOI: 10.3390/cells11244120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 12/12/2022] [Indexed: 12/24/2022] Open
Abstract
The nuclear envelope constitutes a selective barrier that segregates chromatin into the nucleus of eukaryotic cells [...].
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Affiliation(s)
- Wolfram Antonin
- Institute of Biochemistry and Molecular Cell Biology, Medical School, RWTH Aachen University, 52074 Aachen, Germany
- Correspondence: (W.A.); (S.S.)
| | - Symeon Siniossoglou
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK
- Correspondence: (W.A.); (S.S.)
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