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Identification of Intragenic Deletions and Duplication in the FLCN Gene in Birt-Hogg-Dube Syndrome

  1. Author:
    Benhammou, J. N. B. J. N.
    Vocke, C. D.
    Santani, A.
    Schmidt, L. S.
    Baba, M.
    Seyama, K.
    Wu, X. L.
    Korolevich, S.
    Nathanson, K. L.
    Stolle, C. A.
    Linehan, W. M.
  2. Author Address

    [Benhammou, JN Benhammou, JN; Vocke, CD; Schmidt, LS; Baba, M; Linehan, WM] NCI, Urol Oncol Branch, NIH, Bethesda, MD 20892 USA [Santani, A; Stolle, CA] Childrens Hosp Philadelphia, Mol Genet Lab, Dept Pathol & Lab Med, Abramson Res Ctr, Philadelphia, PA 19104 USA [Schmidt, LS] NCI, Basic Sci Program, SAIC Frederick Inc, Frederick, MD 21702 USA [Seyama, K] Juntendo Univ, Sch Med, Dept Resp Med, Tokyo 113, Japan [Wu, XL; Korolevich, S] NCI, Lab Mol Technol, Frederick, MD 21702 USA [Nathanson, KL] Univ Penn, Abramson Res Ctr, Philadelphia, PA 19104 USA [Nathanson, KL] Univ Penn, Dept Med, Div Med Genet, Philadelphia, PA 19104 USA;Schmidt, LS (reprint author), NCI, Urol Oncol Branch, NIH, Bldg 10-CRC-1-3961,10 Ctr Dr MSC1107, Bethesda, MD 20892 USA;schmidtl@mail.nih.gov
    1. Year: 2011
    2. Date: Jun
  1. Journal: Genes Chromosomes & Cancer
    1. 50
    2. 6
    3. Pages: 466-477
  2. Type of Article: Article
  3. ISSN: 1045-2257
  1. Abstract:

    Birt-Hogg-Dube syndrome (BHDS), caused by germline mutations in the folliculin (FLCN) gene, predisposes individuals to develop fibrofolliculomas, pulmonary cysts, spontaneous pneumothoraces, and kidney cancer. The FLCN mutation detection rate by bidirectional DNA sequencing in the National Cancer Institute BHDS cohort was 88%. To determine if germline FLCN intragenic deletions/duplications were responsible for BHDS in families lacking FLCN sequence alterations, 23 individuals from 15 unrelated families with clinically confirmed BHDS but no sequence variations were analyzed by real-time quantitative PCR (RQ-PCR) using primers for all 14 exons. Multiplex ligation-dependent probe amplification (MLPA) assay and array-based comparative genomic hybridization (aCGH) were utilized to confirm and fine map the rearrangements. Long-range PCR followed by DNA sequencing was used to define the breakpoints. We identified six unique intragenic deletions in nine patients from six different BHDS families including four involving exon 1, one that spanned exons 2-5, and one that encompassed exons 7-14 of FLCN. Four of the six deletion breakpoints were mapped, revealing deletions ranging from 5688 to 9189 bp. In addition, one 1341 bp duplication, which included exons 10 and 11, was identified and mapped. This report confirms that large intragenic FLCN deletions can cause BHDS and documents the first large intragenic FLCN duplication in a BHDS patient. Additionally, we identified a deletion "hot spot" in the 5'-noncoding-exon 1 region that contains the putative FLCN promoter based on a luciferase reporter assay. RQ-PCR, MLPA and aCGH may be used for clinical molecular diagnosis of BHDS in patients who are FLCN mutation-negative by DNA sequencing.

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External Sources

  1. DOI: 10.1002/gcc.20872
  2. WOS: 000289375800009

Library Notes

  1. Fiscal Year: FY2010-2011
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