Splice-site mutation causing partial retention of intron in the FLCN gene in Birt-Hogg-Dubé syndrome: a case report.

Abstract:

BACKGROUND:Birt-Hogg-Dubé syndrome (BHD) is an autosomal dominant disorder caused by germline mutations in the folliculin gene (FLCN). Nearly 150 pathogenic mutations have been identified in FLCN. The most frequent pattern is a frameshift mutation within a coding exon. In addition, splice-site mutations have been reported, and previous studies have confirmed exon skipping in several cases. However, it is poorly understood whether there are any splice-site mutations that cause translation of intron regions in FLCN. CASE PRESENTATION:A 59-year-old Japanese patient with multiple pulmonary cysts and pneumothorax was hospitalized due to dyspnea. BHD was suspected and genetic testing was performed. The patient exhibited the splice-site mutation of FLCN in the 5' end of intron 9 (c.1062 + 1G > A). Total mRNA was extracted from pulmonary cysts, and RT-PCR assessment and sequence analyses were done. Two distinct bands were generated; one was wild-type and the other was a larger-sized mutant. Sequence analysis of the latter transcript revealed the insertion of 130 base pairs of intron 9 from the beginning of the splice-site between exons 9 and 10. CONCLUSION:To our knowledge, this is the first report of distinct intron insertion using a BHD patient's diseased tissue-derived mRNA. The present case suggests that a splice-site mutation can lead to exon skipping as well as intron reading mRNA. The splicing process may be dependent in part on whether the donor or acceptor site is affected.

journal_name

BMC Med Genomics

journal_title

BMC medical genomics

authors

Furuya M,Kobayashi H,Baba M,Ito T,Tanaka R,Nakatani Y

doi

10.1186/s12920-018-0359-5

subject

Has Abstract

pub_date

2018-05-02 00:00:00

pages

42

issue

1

issn

1755-8794

pii

10.1186/s12920-018-0359-5

journal_volume

11

pub_type

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