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Novel compound heterozygous mutations of ATM in ataxia-telangiectasia: A case report and calculated prevalence in the Republic of Korea
J Genet Med 2018;15:110-114
Published online December 31, 2018;
© 2018 Korean Society of Medical Genetics and Genomics.

Min Jeong Jang1, Cha Gon Lee1,*, and Hyun Jung Kim2

1Department of Pediatrics, Nowon Eulji Medical Center, Eulji University, Seoul, Korea
2Department of Rehabilitation Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Korea
Cha Gon Lee, M.D.
Division of Child Neurology, Department of Pediatrics, Nowon Eulji Medical Center, Eulji University, 68 Hangeulbiseok-ro, Nowon-gu, Seoul 01830, Korea.
Tel: +82-2-970-8222, Fax: +82-2-970-0068, E-mail:
Received August 24, 2018; Revised October 13, 2018; Accepted October 15, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Ataxia-telangiectasia (AT; OMIM 208900) is a rare autosomal recessive inherited progressive neurodegenerative disorder, with onset in early childhood. AT is caused by homozygous or compound heterozygous mutations in ATM (OMIM 607585) on chromosome 11q22. The average prevalence of the disease is estimated at 1 of 100,000 children worldwide. The prevalence of AT in the Republic of Korea is suggested to be extremely low, with only a few cases genetically confirmed thus far. Herein, we report a 5-year-old Korean boy with clinical features such as progressive gait and truncal ataxia, both ankle spasticity, dysarthria, and mild intellectual disability. The patient was identified as a compound heterozygote with two novel genetic variants: a paternally derived c.5288_5289insGA p.(Tyr1763*) nonsense variant and a maternally derived c.8363A>C p.(His2788Pro) missense variant, as revealed by next-generation sequencing and confirmed by Sanger sequencing. Based on claims data from the Health Insurance Review and Assessment Service Republic of Korea, we calculated the prevalence of AT in the Republic of Korea to be about 0.9 per million individuals, which is similar to the worldwide average. Therefore, we suggest that multi-gene panel sequencing including ATM should be considered early diagnosis.
Keywords : Spinocerebellar degenerations, Ataxia telangiectasia, High-throughput nucleotide sequencing, Prevalence

December 2018, 15 (2)
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