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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Abbreviations
- BUN:
-
Blood urea nitrogen
- CBC:
-
Complete blood count
- CC:
-
Coiled coil
- CPK:
-
Creatine phosphate kinase
- DD:
-
Developmental delay
- EEG:
-
Electroencephalography
- EMG:
-
Electromyography
- ID:
-
Intellectual disability
- JBTS:
-
Joubert syndrome
- MRI:
-
Magnetic resonance imaging
- MTS:
-
Molar tooth sign
- NCV:
-
Nerve conduction velocity
- OMA:
-
Ocular motor apraxia
- OMIM:
-
Online Mendelian inheritance in man
- TFT:
-
Thyroid function tests
- TOG:
-
Tumor-overexpressed gene
- WES:
-
Whole-exome sequencing
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Acknowledgements
We appreciate Tehran University of Medical Sciences for supporting this study under the grant ID of 1400-3-101-55097. We also appreciate the parents of the proband for participation in this project.
Funding
This work was supported by Tehran University of Medical Sciences (Grant number [1400–3-101–55097]).
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ARN, RS and MM contributed to the study conception and design. Clinical evaluation and data collection were performed by RS and MR, Data analysis was performed by ARN and LH. The first draft of the manuscript was written by MM and MR. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Tehran University of Medical Sciences (Date August 1, 2021/No:55097).
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Written informed consent was obtained from the parents.
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The authors affirm that human research participants provided informed consent for publication of patient WES data and clinicopathological features.
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Badv, R.S., Mahdiannasser, M., Rasoulinezhad, M. et al. CEP104 gene may involve in the pathogenesis of a new developmental disorder other than joubert syndrome. Mol Biol Rep 49, 7231–7237 (2022). https://doi.org/10.1007/s11033-022-07353-w
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DOI: https://doi.org/10.1007/s11033-022-07353-w