Surfactant protein B deficiency caused by a novel mutation involving multiple exons of the SP-B gene

F.A.B.A. Schuerman, M. Griese, J.J.P. Gille, F. Brasch, L.A. Noorduyn, A.H. van Kaam

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Abstract

BACKGROUND: Inability to produce surfactant protein (SP)-B causes fatal neonatal respiratory disease. Homozygosity for a frameshift mutation (121ins2) in the gene encoding SP-B (SFTPB) is the predominant but not the exclusive cause of disease. OBJECTIVES: To report a novel mutation in the SFTB gene. METHODS: We analyzed tracheal aspirates, lung tissue obtained by in vivo lung biopsy and DNA from a newborn infant with lethal respiratory failure. RESULTS: DNA analysis revealed a large homozygous genomic deletion encompassing exon 7 and 8 of SFTPB gene, a mutation we described as c.673-1248del2959. The parents were both heterozygous carriers. Analysis of the SP profile in tracheal aspirates and lung tissue by immunohistochemistry, routine and electron microscopy supported the diagnosis of SP-B deficiency and suggested that this large mutation might lead to abnormal routing and processing of proSP-B and proSP-C. CONCLUSIONS: This report shows that SP-B deficiency can also be caused by a multi exon deletion in the SFTPB gene and this finding emphasizes the importance of using modern DNA analysis techniques capable of detecting multi exon deletions
Original languageUndefined/Unknown
Pages (from-to)281-286
JournalEuropean Journal of Medical Research
Volume13
Issue number6
Publication statusPublished - 2008

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