Abstract
Background Marfan's syndrome (MFS) is an autosomal dominant inheritance disorder with a 1/5,000
live-birth prevalence. It is characterized by a wide range of clinical manifestations
with more than 3,000 mutations identified in the FBN1 gene. In this study, we aimed to determine if specific patterns of circulating micro-RNAs
(miRNAs) are associated with MFS-associated with cardiovascular diseases.
Methods Microarray-based miRNA profiling was performed on blood samples of 12 MFS patients,
and 12 healthy volunteers (HVs) controls and the differences in miRNA abundance between
the two groups were validated using independent cohorts of 22 MFS and of 22 HV controls
by real-time quantitative polymerase chain reaction (RT-qPCR). Enrichment analyses
of altered miRNA abundance were predicted using bioinformatics tools.
Results Altered miRNA abundance levels were determined between MFS (n = 34) and HVs (n = 34). In a screening phase, we analyzed 12 patients with MFS and 12 HVs by miRNA
microarray. We found 198 miRNAs that were significantly altered in MFS patients as
compared with HVs, including 16 miRNAs with a more than 1.5-fold change. Out of these
16 miRNAs, 10 showed a decreased abundance and 6 showed an increased abundance. In
the validation phase, we analyzed independent cohorts of 22 MFS and of 22 HV controls
by RT-qPCR. We confirmed the direction of abundance changes and the significance of
different abundances between MFS patients and HVs for four miRNAs, namely, miR-362–5p,
miR-339–3p, miR-340–5p, and miR-210–3p. Only the miR-150–5p showed a significant correlation
with mitral valve prolapse (p = 0.010). The predicted targets for the validated miRNAs were associated with signal
transduction, tissue remodeling, and cellular interaction pathways.
Conclusion The altered abundance level of different miRNAs in whole blood of MFS patients lays
the ground to the development of novel diagnostic approaches with altered miRNAs levels
associated with MFS with manifestations associated with cardiovascular diseases.
Keywords
Micro-RNA - Marfan syndrome - fibrillin