Delineation of Subtelomeric Deletion of the Long Arm of Chromosome 6

Authors

  • Ji-Yun Lee,

    Corresponding author
    1. Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
    2. Department of Pathology, College of Medicine, Korea University, Seoul, South Korea
      Ji-Yun Lee, Ph.D., 5-1, Anam-Dong, Seoungbuk-Gu, Seoul, South Korea, 136-705. Tel: 82-2-920-6144; Fax: 82-2-953-3130; E-mail: jiyun-lee@korea.ac.kr, jlee13@ouhsc.edu
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  • Youl-Hee Cho,

    1. Department of Medical Genetics, College of Medicine, Hanyang University, Seoul, South Korea
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  • Gene Hallford

    1. Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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Ji-Yun Lee, Ph.D., 5-1, Anam-Dong, Seoungbuk-Gu, Seoul, South Korea, 136-705. Tel: 82-2-920-6144; Fax: 82-2-953-3130; E-mail: jiyun-lee@korea.ac.kr, jlee13@ouhsc.edu

Summary

Pure subtelomeric deletion of the long arm of chromosome 6 is rare. The frequency of this deletion accounts for approximately 0.05% of subjects with intellectual disability and developmental delay with or without dysmorphic features. Common phenotypes associated with this deletion include intellectual disability, developmental delay, dysmorphic features, seizure, hypotonia, microcephaly and hypoplasia of the corpus callosum. The smallest overlapped region is approximately 0.4 Mb, and contains three known genes. Of these genes, TBP has been considered as a plausible candidate gene for the phenotype in patients with a subtelomeric 6q deletion. Analysis of the breakpoints in 14 cases revealed a potential common breakpoint interval 8.0–9.0 Mb from the chromosome 6q terminus where the FRA6E fragile site exists and the PARK2 gene is located. This suggests that breakage at the FRA6E fragile site may be the mechanism behind chromosome 6q subtelomeric deletion in some of the cases.

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