Abstract
Cerebral palsy (CP) is a neurodevelopmental disorder characterized by abnormal movement or posture. CP can have many different causes, but genomic copy number variants are causal in at least 4% of patients with typical CP, and at least 14% have disease-causing single nucleotide variants or indels. Pathogenic genomic lesions of major effect probably account the neurological deficits in more than twice as many patients with atypical CP, i.e., neuromotor dysfunction with additional neurodevelopmental abnormalities or malformations, or with MRI findings and medical history that are not characteristic of a perinatal insult. Disease-causing variants of many different genetic loci can produce a CP-like phenotype, and most genetic changes of major effect that cause CP arise as de novo mutations. The importance of genetic variants of minor effect and of epigenetic modifications in producing a multifactorial predisposition to CP is unclear.
Recognizing the specific cause of CP in an affected individual is essential to providing optimal clinical management. An etiological diagnosis provides families an “enhanced compass” that improves overall well-being, facilitates access to educational and social services, permits accurate genetic counseling, and may make precision therapy that targets the pathophysiology available. Trio exome sequencing with assessment of copy number or trio genome sequencing is indicated in the initial clinical workup of children with CP, especially those with additional malformations or neurodevelopmental abnormalities.
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Acknowledgements
We gratefully acknowledge Peter van Essen, MSc (Radboudumc, The Netherlands) for the literature search and data extraction. This study makes use of data generated by the DECIPHER community. A full list of centres which contributed to the generation of the data is available from https://decipher.sanger.ac.uk/about/stats and via email from decipher@sanger.ac.uk. Funding for the DECIPHER project was provided by Wellcome. Those who carried out the original analyses and data collection bear no responsibility for the further analysis or interpretation of the data.
Multiple Choice Questions
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1.
The mode of inheritance in the majority of cerebral palsy patients is:
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(a)
X-linked dominant (de novo)
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(b)
Autosomal recessive
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(c)
Autosomal dominant (de novo)
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(d)
None of the above
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(a)
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2.
Establishing a diagnosis in cerebral palsy has implications for
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(a)
Supportive care
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(b)
Prognosis and counselling
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(c)
Prevention and treatment
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(d)
All of the above
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(a)
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3.
In patients with cerebral palsy, genetic aberrations occur with the following frequencies
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(a)
disease-causing copy number variants: 4%, and single nucleotide variants or indels: 14%
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(b)
disease-causing copy number variants: 4% and epigenetic signatures: 21%
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(c)
single nucleotide variants or indels: 14% and epigenetic signatures: 21%
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(d)
structural and numeric chromosomal abnormalities: 13% and single nucleotide variants or indels: 14%
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(a)
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4.
The yield of genetic/genomic testing increases if the following features are present:
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(a)
positive family history for cerebral palsy, periventricular leukomalacia on neuro-imaging, progressive disease course
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(b)
progressive disease course, multi-organ involvement, affected siblings
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(c)
unexplained death in the family, progressive disease course, normal neuro-imaging
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(d)
abnormalities on prenatal sonogram, normal newborn screening, behavioural problems
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(a)
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Friedman, J., van Karnebeek, C. (2023). Genetics and Genomics of Cerebral Palsy. In: Eisenstat, D.D., Goldowitz, D., Oberlander, T.F., Yager, J.Y. (eds) Neurodevelopmental Pediatrics. Springer, Cham. https://doi.org/10.1007/978-3-031-20792-1_35
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