Multi-Omic Integration of the miRNome and Transcriptome in Dermal Fibroblasts from Hypermobile Ehlers-Danlos Syndrome and Hypermobility Spectrum Disorders Identifies Convergent Candidate miRNA-mRNA Regulatory Networks Linking Extracellular Matrix Remodeling and Inflammation.
Pelisenco I, Cinquina V, et al. • International journal of molecular sciences • 2026
Multi-omic integration of miRNome and transcriptome data from dermal fibroblasts identified 88 differentially expressed miRNAs in pooled hEDS/HSD versus controls, with experimentally supported targets of upregulated miRNAs overlapping downregulated genes significantly more than expected by chance, converging on extracellular matrix remodeling, TGF-β/BMP, Wnt/Hippo, focal adhesion, and cytoskeletal programs.
Key Findings
Results
No miRNA met the differential-expression threshold in the direct hEDS versus HSD comparison, suggesting shared rather than distinct miRNA profiles between these two conditions.
miRNome sequencing was performed in cultured dermal fibroblasts from 12 individuals with hEDS, 12 with HSD, and 24 controls
The direct hEDS versus HSD comparison yielded no differentially expressed miRNAs meeting threshold
This mirrors previously reported transcriptomic convergence between hEDS and HSD at the mRNA level
The absence of distinguishing miRNA signatures supports the clinical difficulty in molecularly differentiating these two conditions
Results
Pooled hEDS/HSD analysis identified 88 differentially expressed miRNAs compared to controls, with 42 upregulated and 46 downregulated.
The pooled hEDS/HSD group versus controls comparison was the primary productive analysis
42 miRNAs were upregulated and 46 were downregulated in hEDS/HSD fibroblasts relative to controls
25 of the differentially expressed miRNAs were assessed by qPCR in pooled discovery material and an independent pooled cohort
qPCR supported cross-platform and pooled group-level concordance
qPCR validation did not assess interindividual validation
Results
Experimentally supported targets of upregulated DE-miRNAs overlapped with 388 downregulated genes significantly more than expected by chance.
The overlap of 388 genes between targets of upregulated miRNAs and downregulated mRNAs exceeded chance expectation
This inverse relationship is consistent with canonical miRNA-mediated post-transcriptional repression
These 388 genes converged on extracellular matrix remodeling, TGF-β/BMP, Wnt/Hippo, focal adhesion, and cytoskeletal programs
This finding represents the primary hypothesis-generating result of the multi-omic integration
Results
The 27-gene inverse overlap for downregulated DE-miRNAs did not exceed chance expectation, though it included literature-supported chemokine and matrix-degradative candidates.
Only 27 genes formed the inverse overlap between downregulated miRNAs and upregulated mRNAs
This overlap did not exceed chance expectation statistically, contrasting with the upregulated miRNA analysis
Despite not reaching statistical significance, the 27-gene set included literature-supported chemokine and matrix-degradative candidates
The authors describe these as 'hypothesis-generating' rather than confirmed regulatory relationships
Results
Candidate miRNA-mRNA regulatory networks converged on extracellular matrix remodeling and inflammation as shared biological themes in hEDS/HSD fibroblasts.
Pathway enrichment among the 388-gene overlap implicated TGF-β/BMP signaling, Wnt/Hippo signaling, focal adhesion, and cytoskeletal programs
Inflammation-related pathways including chemokine signaling were represented in the downregulated miRNA target analysis
These pathways align with known connective tissue biology relevant to hEDS and HSD
The convergence of miRNA and mRNA findings on these pathways was described as supporting 'candidate regulatory axes'
Discussion
The study was conducted in cultured dermal fibroblasts without paired biofluids, longitudinal sampling, or phenotype correlations, limiting in vivo and biomarker implications.
All analyses were performed on cultured cells, not primary tissue or biofluids
No longitudinal sampling was performed
No phenotype correlations were assessed
The authors explicitly state that 'in vivo and biomarker implications remain preliminary'
qPCR validation used pooled rather than individually resolved samples, precluding interindividual validation
Background
hEDS and HSD are clinically defined connective tissue conditions currently lacking molecular biomarkers, which motivated the search for miRNA-mediated regulatory signatures.
hEDS and HSD are described as 'clinically defined connective tissue conditions lacking molecular biomarkers'
The study tested 'whether their transcriptomic convergence extends to miRNA-mediated post-transcriptional regulation'
The absence of established molecular biomarkers is a recognized gap that this study aimed to begin addressing
Prior transcriptomic work had identified convergent mRNA-level changes, providing rationale for miRNA investigation
What This Means
This research suggests that people with hypermobile Ehlers-Danlos syndrome (hEDS) and hypermobility spectrum disorders (HSD) — two related connective tissue conditions — share a distinct pattern of small regulatory molecules called microRNAs (miRNAs) in skin cells called fibroblasts. By comparing miRNA activity in fibroblasts from 12 hEDS patients, 12 HSD patients, and 24 healthy controls, the researchers found 88 miRNAs whose activity levels differed between the patient group and controls, but found no meaningful miRNA differences between hEDS and HSD themselves. This supports the idea that these two conditions, though diagnosed separately based on clinical criteria, may share underlying biological mechanisms at the molecular level.
The most notable finding was that miRNAs showing increased activity in hEDS/HSD fibroblasts appeared to be suppressing a set of 388 genes that were also found to be less active in these patients — and this overlap was larger than would be expected by random chance. These targeted genes are involved in processes such as extracellular matrix remodeling (the scaffolding that holds tissues together), TGF-β and BMP signaling (pathways that regulate tissue growth and repair), Wnt and Hippo signaling (involved in cell behavior and tissue homeostasis), and inflammation. This pattern points toward specific molecular pathways that may contribute to the tissue fragility and inflammation seen in these conditions.
However, the authors are careful to note that these findings are preliminary and hypothesis-generating. The study was conducted in laboratory-grown skin cells rather than living tissue, used pooled samples rather than individual patient samples for key validation steps, and did not examine how these molecular patterns relate to specific symptoms or disease severity. This research suggests that miRNA-driven regulation of extracellular matrix and inflammatory pathways may be relevant to hEDS and HSD biology, but further studies with larger, individually validated cohorts and tissue samples will be needed before these findings can be considered for any clinical or biomarker applications.
Pelisenco I, Cinquina V, Chiarelli N, Bertini V, Martini P, Carini G, et al.. (2026). Multi-Omic Integration of the miRNome and Transcriptome in Dermal Fibroblasts from Hypermobile Ehlers-Danlos Syndrome and Hypermobility Spectrum Disorders Identifies Convergent Candidate miRNA-mRNA Regulatory Networks Linking Extracellular Matrix Remodeling and Inflammation.. International journal of molecular sciences. https://doi.org/10.3390/ijms27198628