Acquired somatic mutations in the microsatellite DNA, in children with bronchial asthma.

Abstract:

OBJECTIVES:High incidence of genetic alterations at the microsatellite (MS) DNA level has been reported in asthmatic adults. WORKING HYPOTHESIS:The aim of this study was to investigate whether microsatellite instability (MSI) and loss of heterozygosity (LOH) were detectable phenomena in children with asthma. METHODOLOGY:DNA was extracted from sputum and blood cells of 27 children (10.8 +/- 2.5 years) with mild to moderate asthma, and from 8 healthy, never-smoked young adults. Fourteen polymorphic MS markers, namely D5S207, D5S820, D5S637, D6S344, D6S2223, D6S263, SGC35231, D11S1253, D11S1337, D11S97, USAT24G1, D13S273, D14S258, and D14S292, located on chromosomes (chr) 5q, 6p, 11q, 13q, and 14q were used to assess MSI and LOH. RESULTS:None of the healthy subjects exhibited any genetic alteration. Five out of 27 children (18.5%) exhibited MSI or LOH in sputum cells versus blood samples from which 3 in the marker USAT24G1 (chr 13q14.1), 1 in the marker D14S258 (chr 14q23-q24.3), and 1 in the marker D5S637 (chr 5q12-q13). Compared to a previous study, with asthmatic adults, whereas MSI and/or LOH was exhibited in approximately 60% of the cases, the current study reported <20% of genetic alterations, at the MS DNA, in asthmatic children. CONCLUSIONS:Our results showed that genetic instability in the MS DNA, is present in asthmatic children, but to less extent than in adult asthmatics from previous studies. These findings may support the hypothesis that somatic mutations may be early acquired in the natural course of asthma and could represent another contributor to the molecular pathogenesis of the disease. However, further studies are needed to clarify this hypothesis.

journal_name

Pediatr Pulmonol

journal_title

Pediatric pulmonology

authors

Thomou C,Paraskakis E,Neofytou E,Kalmanti M,Siafakas NM,Tzortzaki EG

doi

10.1002/ppul.21097

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

1017-24

issue

10

eissn

8755-6863

issn

1099-0496

journal_volume

44

pub_type

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