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. 1995 Jan 15;305(Pt 2):583–590. doi: 10.1042/bj3050583

Dinucleotide repeats in the human surfactant protein-B gene and respiratory-distress syndrome.

J Floros 1, S V Veletza 1, P Kotikalapudi 1, L Krizkova 1, A M Karinch 1, C Friedman 1, S Buchter 1, K Marks 1
PMCID: PMC1136402  PMID: 7832777

Abstract

Pulmonary surfactant, a lipoprotein complex, is essential for normal lung function, and deficiency of surfactant can result in respiratory-distress syndrome (RDS) in the prematurely born infant. Some studies have pointed towards a genetic contribution to the aetiology of RDS. Because the surfactant protein B (SP-B) is important for optimal surfactant function and because it is involved in the pathogenesis of pulmonary disease, we investigated the genetic variability of the SP-B gene in individuals with and without RDS. We identified a 2.5 kb BamHI polymorphism and studied its location, nature and frequency. We localized this polymorphism in the first half of intron 4 and found that it is derived by gain or loss in the number of copies of a motif that consists of two elements, a 20 bp conserved sequence and a variable number of CA dinucleotides. Variability in the number of motifs resulting from either deletion (in 55.3% of the cases with the variation) or insertion (44.7%) of motifs was observed in genomic DNAs from unrelated individuals. Analysis of 219 genomic DNAs from infants with (n = 82) and without (n = 137) RDS showed that this insertion/deletion appears with significantly higher frequency in the RDS population (29.3 as against 16.8%, P < 0.05).

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