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Ouyang G, Yi E, Qin H, Duan X, Wang S, Peng X. A patient with 18p11.32-p11.21 deletion have monaural deafness caused by an inadequate haplodose of THOC1: A case report. Medicine (Baltimore) 2024; 103:e39048. [PMID: 39058882 PMCID: PMC11272337 DOI: 10.1097/md.0000000000039048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Accepted: 07/02/2024] [Indexed: 07/28/2024] Open
Abstract
BACKGROUND THOC1 mutation causes Deafness, autosomal dominant 86 [OMIM: 620280]. However, it has not been reported whether deletion of the THOC1 gene causes deafness. METHODS Here, we report a 1-year-old girl with clinical features including Hypotonia, unilateral deafness in the right ear, and widening of lateral ventricles in 6 months. Gene mutations were identified by whole-exome sequencing. RESULTS Through whole-exome sequencing, a deletion of 18p11.32-p11.21 contains the deletion of all THOC1 genes found in the patient but not in her parents' genomic DNA. The ClinGen Database Haplodose Insufficiency (HI) prediction tool determined that HI, THOC1 HI may cause unilateral deafness. Moreover, after 6 months of rehabilitation training, muscle tone returned to normal. However, at the age of 1 year, the patient developed symptoms of a large liver and hamartoma of both kidneys. CONCLUSION From the above results, we propose that in our patient, THOC1 HI may cause unilateral deafness. Therefore, this study provides a new THOC1 deletion associated with unilateral deafness.
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Affiliation(s)
- Geng Ouyang
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
| | - Enhuan Yi
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
- Central Laboratory, Changsha Hospital for Maternal and Child Health Care Affiliated to Hunan Normal University, Changsha, China
| | - Huali Qin
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
| | - Xingxing Duan
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
- Central Laboratory, Changsha Hospital for Maternal and Child Health Care Affiliated to Hunan Normal University, Changsha, China
| | - Sifeng Wang
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
- Central Laboratory, Changsha Hospital for Maternal and Child Health Care Affiliated to Hunan Normal University, Changsha, China
| | - Xiangwen Peng
- Central Laboratory, Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control, Changsha Hospital for Maternal & Child Health Care Affiliated to Hunan Normal University, Changsha, China
- Central Laboratory, Changsha Hospital for Maternal and Child Health Care Affiliated to Hunan Normal University, Changsha, China
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Zhao X, He Z, Li Y, Yang X, Li B. Atypical absence seizures and gene variants: A gene-based review of etiology, electro-clinical features, and associated epilepsy syndrome. Epilepsy Behav 2024; 151:109636. [PMID: 38232560 DOI: 10.1016/j.yebeh.2024.109636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/01/2024] [Accepted: 01/05/2024] [Indexed: 01/19/2024]
Abstract
Atypical absence seizures are generalized non-convulsive seizures that often occur in children with cognitive impairment. They are common in refractory epilepsy and have been recognized as one of the hallmarks of developmental epileptic encephalopathies. Notably, pathogenic variants associated with AAS, such as GABRG2, GABRG3, SLC6A1, CACNB4, SCN8A, and SYNGAP1, are also linked to developmental epileptic encephalopathies. Atypical absences differ from typical absences in that they are frequently drug-resistant and the prognosis is dependent on the etiology or related epileptic syndromes. To improve clinicians' understanding of atypical absences and provide novel perspectives for clinical treatment, we have reviewed the electro-clinical characteristics, etiologies, treatment, and prognosis of atypical absences, with a focus on the etiology of advancements in gene variants, shedding light on potential avenues for improved clinical management.
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Affiliation(s)
| | - Zimeng He
- Shandong University, Jinan, Shandong, China
| | - Yumei Li
- Shandong University, Jinan, Shandong, China
| | - Xiaofan Yang
- Shandong University, Jinan, Shandong, China; Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, Shandong, China.
| | - Baomin Li
- Shandong University, Jinan, Shandong, China; Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, Shandong, China.
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Han M, Wei L, Liu F, Gao X. Familial microdeletion 18p11.32 to 18p11.31 in a Chinese family with normal phenotype. Mol Cytogenet 2022; 15:12. [PMID: 35331298 PMCID: PMC8943926 DOI: 10.1186/s13039-022-00590-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 03/11/2022] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Chromosomal imbalances of several megabasepair in size are normally deleterious for the carrier. Still, rarely reported are so-called "unbalanced chromosome abnormalities" (UBCAs), which are either gains or losses or equally large genomic regions, but the affected person is not or only minimally clinically affected. The knowledge of such UBCAs is imperative also in chromosomal microarray analysis (CMA) or noninvasive prenatal testing (NIPT). CASE PRESENTATION A maternally inherited del(18)(p11.32p11.31) was identified in a over two generations in a Chinese family with normal phenotype. The affected region encompasses 19 genes, among which TGIF1 is expressed in fetal and adult nervous system. TGIF1 deletions and /or mutations have been seen in cases with holoprosencephaly but also non-affected individuals, suggesting incomplete penetrance and variable expressivity. CONCLUSIONS Deletions in the terminal region of chromosome 18 short arm have been reported previously in clinically healthy persons. Here a further family with an UBCA in 18p11.3 is added to the literature, suggesting a careful genetic counselling in comparable, especially prenatal cases.
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Affiliation(s)
- Miaomiao Han
- Department of Obstetrics and Gynecology, Maternal and Child Health Hospital of Dongxihu District, Wuhan, Hubei, China
| | - Lei Wei
- Department of Center for Reproductive Medicine, TaiHe Hospital, Hubei University of Medicine, Shiyan, Hubei, People's Republic of China
| | - Fang Liu
- Department of Gynecology, Huangshi Love & Health Hospital Affiliated To Hubei Polytechnic University, Huangshi, Hubei, People's Republic of China
| | - Xia Gao
- Department of Obstetrics, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei, People's Republic of China.
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Ortiz JF, Ruxmohan S, Alzamora IM, Patel A, Eissa-Garcés A. Refractory Seizure in a Patient With Griscelli Syndrome: A Unique Case With One Mutation and a Novel Deletion. Cureus 2021; 13:e14402. [PMID: 33981514 PMCID: PMC8109045 DOI: 10.7759/cureus.14402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Griscelli syndrome (GS) is a rare syndrome characterized by hypopigmentation, immunodeficiency, and neurological features. The genes Ras-related protein (RAB27A) and Myosin-Va (MYO5A) are involved in this condition's pathogenesis. We present a GS type 1 (GS1) case with developmental delay, hypotonia, and refractory seizures despite multiple medications, which included clobazam, cannabinol, zonisamide, and a ketogenic diet. Lacosamide and levetiracetam were added to the treatment regimen, which decreased the seizures' frequency from 10 per day to five per day. The patient had an MYO5A mutation and, remarkably, a deletion on 18p11.32p11.31. The deletion was previously reported in a patient with refractory seizures and developmental delay. We reviewed all cases of GS that presented with seizures. We reviewed other cases of GS and seizures described in the literature and explored possible seizure mechanisms in GS. Seizure in GS1 seems to be related directly to the MYO5A mutation. The neurological manifestations in GS2 seem to be caused indirectly by the accelerated phase of Hemophagocytic syndrome (HPS), which is characteristic of GS2. By having the MYO5A gene mutation combined with the 18p11.32p11.31 deletion, the prognosis and severity of the patient's condition are poor. This is the first report of GS1 with a deletion in 18p11.32p11.31.
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Affiliation(s)
- Juan Fernando Ortiz
- Neurology, Universidad San Francisco de Quito, Quito, ECU.,Neurology, Larkin Community Hospital, Miami, USA
| | - Samir Ruxmohan
- Neurology, Larkin Community Hospital, Miami, Florida, USA
| | | | - Amrapali Patel
- Public Health, George Washington University, Washington, USA
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Le TNU, Nguyen VN, Doan TDA, Doan HNB, Le PTQ, Le TL, Ha TMT. An experience in prenatal diagnosis via QF-PCR of a female child with a 9.9 Mb pure deletion at 18p11.32-11.22. NAGOYA JOURNAL OF MEDICAL SCIENCE 2020; 82:783-790. [PMID: 33311808 PMCID: PMC7719451 DOI: 10.18999/nagjms.82.4.783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 03/19/2020] [Indexed: 11/30/2022]
Abstract
Quantitative Fluorescent - Polymerase Chain Reaction (QF-PCR) is a rapid prenatal diagnosis test for 21, 18, 13 and sex chromosomal aneuploidy detection. However, it could not detect partial trisomy or partial monosomy of those chromosomes. Here, we report a 19-month-old Vietnamese female with a 9.9 Mb pure deletion of chromosome 18 at 18p11.32-11.22 confirmed by next generation sequencing. The patient was short statured with facial dysmorphic features as well as motor skill and speech delays. First trimester screening showed high risk of trisomy 21 with only increased nuchal translucency (NT 3.9 mm) by ultrasound as an indication. Prenatal diagnosis by QF-PCR from amniotic DNA revealed normal disomy. Noticeably, two short tandem repeat (STR) markers D18S391 and D18S976 located on 18p exhibited uninformative patterns (one peak). Thus, our case suggested that the combination of both D18S391 and D18S976 markers with uninformative patterns in QF-PCR for prenatal diagnosis and increased NT in the first trimester ultrasound may be a significant indication of 18p monosomy.
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Affiliation(s)
- Thanh Nha Uyen Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Viet Nhan Nguyen
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Thi Duyen Anh Doan
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Huu Nhat Binh Doan
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Phan Tuong Quynh Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Tuan Linh Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Thi Minh Thi Ha
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
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Fu Y, Wu Z, Guo Z, Chen L, Ma Y, Wang Z, Xiao W, Wang Y. Systems-level analysis identifies key regulators driving epileptogenesis in temporal lobe epilepsy. Genomics 2020; 112:1768-1780. [DOI: 10.1016/j.ygeno.2019.09.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 08/31/2019] [Accepted: 09/25/2019] [Indexed: 01/05/2023]
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HU J, QIAN Y, SUN Y, YU J, LUO Y, DONG M. [Application of single nucleotide polymorphism microarray in clinical diagnosis of intellectual disability or retardation]. Zhejiang Da Xue Xue Bao Yi Xue Ban 2019; 48:420-428. [PMID: 31901047 PMCID: PMC8800802 DOI: 10.3785/j.issn.1008-9292.2019.08.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/28/2019] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To assess the clinical application of single nucleotide polymorphism microarray (SNP array) in patients with intellectual disability/developmental delay(ID/DD). METHODS SNP array was performed to detect genome-wide DNA copy number variants (CNVs) for 145 patients with ID/DD in Women's Hospital, Zhejiang University School of Medicine from January 2013 to June 2018. The CNVs were analyzed by CHAS software and related databases. RESULTS Among 145 patients, pathogenic chromosomal abnormalities were detected in 32 cases, including 26 cases of pathogenic CNVs and 6 cases of likely pathogenic CNVs. Meanwhile, 18 cases of uncertain clinical significance and 14 cases of likely benign were identified, no significant abnormalities were found in 81 cases (including benign). CONCLUSIONS SNP array is effective for detecting chromosomal abnormalities in patients with ID/DD with high efficiency and resolution.
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Affiliation(s)
| | | | | | | | | | - Minyue DONG
- 董旻岳(1964—), 男, 博士, 主任医师, 博士生导师, 主要从事生殖遗传学研究; E-mail:
;
https://orcid.org/0000-0002-4344-7924
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Xue H, Huang H, Wang Y, An G, Zhang M, Xu L, Lin Y. Molecular cytogenetic identification of small supernumerary marker chromosomes using chromosome microarray analysis. Mol Cytogenet 2019; 12:13. [PMID: 30911334 PMCID: PMC6416931 DOI: 10.1186/s13039-019-0425-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/27/2019] [Indexed: 12/18/2022] Open
Abstract
Background This study aimed to evaluate the feasibility of chromosomal microarray analysis (CMA) in detecting the origin and structure of small supernumerary marker chromosomes (sSMCs) in prenatal and postnatal cases and to clarify sSMC-related genotype-phenotype correlations. Results Thirty-three cases carrying sSMCs were identified by banding cytogenetics. Of these cases, twenty-nine were first characterized by CMA and only two by FISH. The remaining two cases were excluded for their refusal to accept further examination. The chromosomal origins of twenty-two cases were successfully identified, in which pathogenetic copy number variations (PCNVs) were found in sixteen cases, four cases showed variants of uncertain significance (VOUS), one case showed benign CNVs, and one case showed probable PCNVs. For the nine cases with negative CMA results, only one of them contained centromere heterochromatin likely due to its normal phenotype, whereas reasons for the remaining eight cases were uncertain. We also found that CMA results indicating pathogenic abnormalities further affect the rate of pregnancy termination. Conclusions This study showed that CMA combined with cytogenetic analysis is particularly effective in identifying sSMCs. However, in order to establish sSMC-related genotype-phenotype correlations, the inclusion of more sSMC cases will be necessary in future studies.
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Affiliation(s)
- Huili Xue
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Hailong Huang
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Yan Wang
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Gang An
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Min Zhang
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Liangpu Xu
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
| | - Yuan Lin
- Fujian Provincial Key Laboratory for Prenatal diagnosis and Birth Defect, Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001 Fujian China
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Garzon P, Lemelle L, Auvin S. Épilepsie absence de l’enfant : actualités diagnostiques et thérapeutiques. Arch Pediatr 2016; 23:1176-1183. [DOI: 10.1016/j.arcped.2016.08.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 06/19/2016] [Accepted: 08/22/2016] [Indexed: 10/21/2022]
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