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Ryniawec JM, Hannaford MR, Zibrat ME, Fagerstrom CJ, Galletta BJ, Aguirre SE, Guice BA, Dean SM, Rusan NM, Rogers GC. Cep104 is a component of the centriole distal tip complex that regulates centriole growth and contributes to Drosophila spermiogenesis. Curr Biol 2023; 33:4202-4216.e9. [PMID: 37729913 PMCID: PMC10591971 DOI: 10.1016/j.cub.2023.08.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 07/21/2023] [Accepted: 08/24/2023] [Indexed: 09/22/2023]
Abstract
Proper centrosome number and function relies on the accurate assembly of centrioles, barrel-shaped structures that form the core duplicating elements of the organelle. The growth of centrioles is regulated in a cell cycle-dependent manner; while new daughter centrioles elongate during the S/G2/M phase, mature mother centrioles maintain their length throughout the cell cycle. Centriole length is controlled by the synchronized growth of the microtubules that ensheathe the centriole barrel. Although proteins exist that target the growing distal tips of centrioles, such as CP110 and Cep97, these proteins are generally thought to suppress centriolar microtubule growth, suggesting that distal tips may also contain unidentified counteracting factors that facilitate microtubule polymerization. Currently, a mechanistic understanding of how distal tip proteins balance microtubule growth and shrinkage to either promote daughter centriole elongation or maintain centriole length is lacking. Using a proximity-labeling screen in Drosophila cells, we identified Cep104 as a novel component of a group of evolutionarily conserved proteins that we collectively refer to as the distal tip complex (DTC). We found that Cep104 regulates centriole growth and promotes centriole elongation through its microtubule-binding TOG domain. Furthermore, analysis of Cep104 null flies revealed that Cep104 and Cep97 cooperate during spermiogenesis to align spermatids and coordinate individualization. Lastly, we mapped the complete DTC interactome and showed that Cep97 is the central scaffolding unit required to recruit DTC components to the distal tip of centrioles.
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Affiliation(s)
- John M Ryniawec
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
| | - Matthew R Hannaford
- Cell and Developmental Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Melanie E Zibrat
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
| | - Carey J Fagerstrom
- Cell and Developmental Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Brian J Galletta
- Cell and Developmental Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Sophia E Aguirre
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
| | - Bethany A Guice
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
| | - Spencer M Dean
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
| | - Nasser M Rusan
- Cell and Developmental Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
| | - Gregory C Rogers
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA.
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2
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Chuan Z, Ruikun C, Qian L, Shiyue M, Shengju H, Yong Y, Haibo L, Neng X, Yong Z, Huiqin X, Weijia W, Ling H, Bingbo Z, Zhang Q, Yan W, Zongfu C, Xu M. Genetic and Phenotype Analysis of a Chinese Cohort of Infants and Children With Epilepsy. Front Genet 2022; 13:869210. [PMID: 35571021 PMCID: PMC9091957 DOI: 10.3389/fgene.2022.869210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 04/12/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Epilepsy in childhood is a common and diverse neurological disorder. We conducted a genetic and phenotype analysis of a Chinese cohort of infants and children with epilepsy. Methods: We conducted a pedigree analysis of 260 Chinese patients with epilepsy onset during infancy or childhood by whole exome sequencing (WES). Results: Of the 260 probands analyzed, a genetic diagnosis was established in 135 patients. One-hundred eighty-eight phenotypes were detected in those 135 positive/likely positive patients, 106 patients had more than two phenotypes, and 67 patients had more than three phenotypes. A total of 142 variants of 81 genes were detected among the positive/likely positive patients. Among these 142 variants, of which 87 of 66 genes were novel. Conclusion: Our findings extend the variant spectrum of genes related to epilepsy. Our results will be useful for genetic testing and counseling for patients with epilepsy.
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Affiliation(s)
- Zhang Chuan
- National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing, China
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Cai Ruikun
- National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing, China
| | - Li Qian
- National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing, China
| | - Mei Shiyue
- Department of Intensive Care Unit, Henan Provincial Key Laboratory of Children’s Genetics and Metabolic Diseases, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou, China
| | - Hao Shengju
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
| | - Yuan Yong
- Zhongshan City People’s Hospital, Affiliated Zhongshan Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Li Haibo
- The Central Laboratory of Birth Defects Prevention and Control, Ningbo Women and Children’s Hospital, Ningbo, China
| | - Xiao Neng
- Department of Pediatric Neurology, Chenzhou First People’s Hospital, Chenzhou, China
| | - Zhao Yong
- Foshan Women and Children Hospital, Foshan, China
| | - Xue Huiqin
- Children’s Hospital of Shanxi, Women Health Center of Shanxi, Taiyuan, China
| | - Wang Weijia
- Zhongshan City People’s Hospital, Affiliated Zhongshan Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Hui Ling
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
| | - Zhou Bingbo
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
| | - Qinghua Zhang
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
| | - Wang Yan
- Gansu Province Medical Genetics Center, Gansu Provincial Clinical Research Center for Birth Defects and Rare Diseases, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, China
| | - Cao Zongfu
- National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- *Correspondence: Cao Zongfu, ; Ma Xu,
| | - Ma Xu
- National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- *Correspondence: Cao Zongfu, ; Ma Xu,
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3
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Badv RS, Mahdiannasser M, Rasoulinezhad M, Habibi L, Rashidi-Nezhad A. CEP104 gene may involve in the pathogenesis of a new developmental disorder other than joubert syndrome. Mol Biol Rep 2022; 49:7231-7237. [PMID: 35359234 DOI: 10.1007/s11033-022-07353-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 03/09/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND The CEP104 gene (OMIM: 616,690) encodes the centrosome protein 104 (CEP104) that is involved in cilia function. Pathogenic variants in this gene have been described in four patients diagnosed with Joubert syndrome (JBTS) 25. Here, we challenged the concept that pathogenic variants in CEP104 gene are only involved in the development of JBTS 25. METHODS AND RESULTS In a clinical setting, whole-exome sequencing (WES) was applied to investigate pathogenic variants in patients with unexplained developmental delay or intellectual disability (DD/ID).WES revealed a novel homozygous nonsense variant (c.643C > T) in CEP104 (NM _014704.3) in a girl with mild intellectual disability, hypotonia, and imbalanced gait. Her brain MRI data did not show molar tooth sign (MTS) or any other brain anomalies. CONCLUSION Our study introduced a novel variant in the CEP104 gene that results in an ID phenotype other than JBTS25. Comparison of her phenotype with that of eight previously published DD/ID patients harboring pathogenic variants in CEP104 gene revealed that more than half of them did not show JBTS related symptoms. Therefore, we suggest that the CEP104 gene might also be involved in a disorder other than JBTS 25, a point that deserves to be emerged in the OMIM database.
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Affiliation(s)
- Reza Shervin Badv
- Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Mojdeh Mahdiannasser
- Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Rasoulinezhad
- Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Ali Rashidi-Nezhad
- Maternal, Fetal and Neonatal Research Center, Family Health Research Institute, Tehran University of Medical Sciences, Tehran, Iran. .,Genetic Ward, Yas Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. .,Maternal, Fetal and Neonatal Research Center, Family Health Research Institute, Valiasr Hospital, 2nd floor, Baqerkhan st., P.O.Box:1419733141, Tehran, Iran.
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4
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Gana S, Serpieri V, Valente EM. Genotype-phenotype correlates in Joubert syndrome: A review. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2022; 190:72-88. [PMID: 35238134 PMCID: PMC9314610 DOI: 10.1002/ajmg.c.31963] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/04/2022] [Accepted: 02/15/2022] [Indexed: 01/20/2023]
Abstract
Joubert syndrome (JS) is a genetically heterogeneous primary ciliopathy characterized by a pathognomonic cerebellar and brainstem malformation, the “molar tooth sign,” and variable organ involvement. Over 40 causative genes have been identified to date, explaining up to 94% of cases. To date, gene‐phenotype correlates have been delineated only for a handful of genes, directly translating into improved counseling and clinical care. For instance, JS individuals harboring pathogenic variants in TMEM67 have a significantly higher risk of liver fibrosis, while pathogenic variants in NPHP1, RPGRIP1L, and TMEM237 are frequently associated to JS with renal involvement, requiring a closer monitoring of liver parameters, or renal functioning. On the other hand, individuals with causal variants in the CEP290 or AHI1 need a closer surveillance for retinal dystrophy and, in case of CEP290, also for chronic kidney disease. These examples highlight how an accurate description of the range of clinical symptoms associated with defects in each causative gene, including the rare ones, would better address prognosis and help guiding a personalized management. This review proposes to address this issue by assessing the available literature, to confirm known, as well as to propose rare gene‐phenotype correlates in JS.
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Affiliation(s)
- Simone Gana
- Neurogenetics Research Center, IRCCS Mondino Foundation, Pavia, Italy
| | | | - Enza Maria Valente
- Neurogenetics Research Center, IRCCS Mondino Foundation, Pavia, Italy.,Department of Molecular Medicine, University of Pavia, Pavia, Italy
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5
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Zhang X, Shen Y, Li P, Cai R, Lu C, Li Q, Chen C, Yu Y, Cheng T, Wang X, Luo M, Cao M, Cao Z, Ma X. Clinical heterogeneity and intrafamilial variability of Joubert syndrome in two siblings with CPLANE1 variants. Mol Genet Genomic Med 2021; 9:e1682. [PMID: 33822487 PMCID: PMC8222854 DOI: 10.1002/mgg3.1682] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/22/2021] [Accepted: 03/24/2021] [Indexed: 11/18/2022] Open
Abstract
Background Joubert syndrome (JBTS) is a rare genetic disorder that is characterized by midbrain‐hindbrain malformations. Multiple variants in genes that affect ciliary function contribute to the genetic and clinical heterogeneity of JBTS and its subtypes. However, the correlation between genotype and phenotype has not been elucidated due to the limited number of patients available. Methods In this study, we observed different clinical features in two siblings from the same family. The older sibling was classified as a pure JBTS patient, whereas her younger sibling displayed oral‐facial‐digital defects and was therefore classified as an oral‐facial‐digital syndrome type VI (OFD VI) patient. Next, we performed human genetic tests to identify the potential pathogenic variants in the two siblings. Results Genetic sequencing indicated that both siblings harbored compound heterozygous variants of a missense variant (c.1067C>T, p.S356F) and a frameshift variant (c.8377_8378del, p.E2793Lfs*24) in CPLANE1 (NM_023073.3). Conclusion This study reports that two novel CPLANE1 variants are associated with the occurrence of JBTS and OFD VI. These results help elucidate the intrafamilial phenotypic variability associated with CPLANE1 variants.
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Affiliation(s)
- Xiujuan Zhang
- Department of Physiology and Pathophysiology, School of Basic Medicine Sciences, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Peking University, Beijing, China.,Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yue Shen
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Ping Li
- Department of Developmental Pediatrics, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Ruikun Cai
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Chao Lu
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Qian Li
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Cuixia Chen
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Yufei Yu
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Tingting Cheng
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China.,Graduate School of Peking Union Medical College, Beijing, China
| | - Xian Wang
- Department of Physiology and Pathophysiology, School of Basic Medicine Sciences, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Peking University, Beijing, China
| | - Minna Luo
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Muqing Cao
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zongfu Cao
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
| | - Xu Ma
- National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, China
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6
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Luo M, He R, Lin Z, Shen Y, Zhang G, Cao Z, Lu C, Meng D, Zhang J, Ma X, Cao M. Novel Compound Heterozygous Variants in MKS1 Leading to Joubert Syndrome. Front Genet 2020; 11:576235. [PMID: 33193692 PMCID: PMC7592398 DOI: 10.3389/fgene.2020.576235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 09/14/2020] [Indexed: 11/13/2022] Open
Abstract
Joubert syndrome (JBTS) and Meckel-Gruber syndrome (MKS) are rare recessive disorders caused by defects of cilia, and they share overlapping clinical features and allelic loci. Mutations of MKS1 contribute approximately 7% to all MKS cases and are found in some JBTS patients. Here, we describe a JBTS patient with two novel mutations of MKS1. Whole exome sequencing (WES) revealed c.191-1G > A and c.1058delG compound heterozygous variants. The patient presented with typical cerebellar vermis hypoplasia, hypotonia, and developmental delay, but without other renal/hepatic involvement or polydactyly. Functional studies showed that the c.1058delG mutation disrupts the B9 domain of MKS1, attenuates the interactions with B9D2, and impairs its ciliary localization at the transition zone (TZ), indicating that the B9 domain of MKS1 is essential for the integrity of the B9 protein complex and localization of MKS1 at the TZ. This work expands the mutation spectrum of MKS1 and elucidates the clinical heterogeneity of MKS1-related ciliopathies.
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Affiliation(s)
- Minna Luo
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Ruida He
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zaisheng Lin
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yue Shen
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Guangyu Zhang
- Department of Children Rehabilitation, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zongfu Cao
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Chao Lu
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Dan Meng
- Tianjin Key Laboratory of Food and Biotechnology, School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin, China
| | - Jing Zhang
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xu Ma
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Muqing Cao
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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7
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Yamazoe T, Nagai T, Umeda S, Sugaya Y, Mizuno K. Roles of TOG and jelly-roll domains of centrosomal protein CEP104 in its functions in cilium elongation and Hedgehog signaling. J Biol Chem 2020; 295:14723-14736. [PMID: 32820051 DOI: 10.1074/jbc.ra120.013334] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 08/11/2020] [Indexed: 12/26/2022] Open
Abstract
Primary cilia are generated through the extension of the microtubule-based axoneme. Centrosomal protein 104 (CEP104) localizes to the tip of the elongating axoneme, and CEP104 mutations are linked to a ciliopathy, Joubert syndrome. Thus, CEP104 has been implicated in ciliogenesis. However, the mechanism by which CEP104 regulates ciliogenesis remains elusive. We report here that CEP104 is critical for cilium elongation but not for initiating ciliogenesis. We also demonstrated that the tumor-overexpressed gene (TOG) domain of CEP104 exhibits microtubule-polymerizing activity and that this activity is essential for the cilium-elongating activity of CEP104. Knockdown/rescue experiments showed that the N-terminal jelly-roll (JR) fold partially contributes to cilium-elongating activity of CEP104, but neither the zinc-finger region nor the SXIP motif is required for this activity. CEP104 binds to a centriole-capping protein, CP110, through the zinc-finger region and to a microtubule plus-end-binding protein, EB1, through the SXIP motif, indicating that the binding of CP110 and EB1 is dispensable for the cilium-elongating activity of CEP104. Moreover, CEP104 depletion does not affect CP110 removal from the mother centriole, which suggests that CEP104 functions after the removal of CP110. Last, we also showed that CEP104 is required for the ciliary entry of Smoothened and export of GPR161 upon Hedgehog signal activation and that the TOG domain plays a critical role in this activity. Our results define the roles of the individual domains of CEP104 in its functions in cilium elongation and Hedgehog signaling and should enhance our understanding of the mechanism underlying CEP104 mutation-associated ciliopathies.
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Affiliation(s)
- Takashi Yamazoe
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Tomoaki Nagai
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, Japan; Department of Biochemistry, Fukushima Medical University School of Medicine, Fukushima, Japan.
| | - Shinya Umeda
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Yuko Sugaya
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Kensaku Mizuno
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, Japan; Institute of Liberal Arts and Sciences, Tohoku University, Kawauchi, Sendai, Miyagi, Japan.
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8
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Luo M, Cao L, Cao Z, Ma S, Shen Y, Yang D, Lu C, Lin Z, Liu Z, Yu Y, Cai R, Chen C, Gao H, Wang X, Cao M, Ma X. Whole exome sequencing reveals novel CEP104 mutations in a Chinese patient with Joubert syndrome. Mol Genet Genomic Med 2019; 7:e1004. [PMID: 31625690 PMCID: PMC6900356 DOI: 10.1002/mgg3.1004] [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: 08/20/2019] [Revised: 09/17/2019] [Accepted: 09/18/2019] [Indexed: 12/22/2022] Open
Abstract
Background Joubert syndrome (JS, OMIM: 213300) is a recessive developmental disorder characterized by cerebellar vermis hypoplasia and a distinctive mid‐hindbrain malformation called the “molar tooth sign” on axial magnetic resonance imaging. To date, more than 35 ciliary genes have been identified as the causative genes of JS. Methods Whole exome sequencing was performed to detect the causative gene mutations in a Chinese patient with JS followed by Sanger sequencing. RT‐PCR and Sanger sequencing were used to confirm the abnormal transcript of centrosomal protein 104 (CEP104, OMIM: 616690). Results We identified two novel heterozygous mutations of CEP104 in the proband, which were c.2364+1G>A and c.414delC (p.Asn138Lysfs*11) (GenBank: NM_014704.3) and consistent with the autosomal recessive inheritance mode. Conclusion Our study reported the fourth case of JS patients with CEP104 mutations, which expands the mutation spectrum of CEP104 and elucidates the clinical heterogeneity of JS.
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Affiliation(s)
- Minna Luo
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Li Cao
- Child Healthcare Department (Child Early Development Center), Sichuan Provincial Hospital for Women and Children, Chengdu, China
| | - Zongfu Cao
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Siyu Ma
- National Research Institute for Family Planning, Beijing, China.,Graduate School of Peking Union Medical College, Beijing, China
| | - Yue Shen
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Di Yang
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Chao Lu
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Zaisheng Lin
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhimin Liu
- Department of Radiology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Yufei Yu
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Ruikun Cai
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Cuixia Chen
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Huafang Gao
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
| | - Xueyan Wang
- Department of Prenatal Diagnosis, Sichuan Provincial Hospital for Women and Children, Chengdu, China
| | - Muqing Cao
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xu Ma
- National Research Institute for Family Planning, Beijing, China.,National Human Genetic Resources Center, Beijing, China
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