Altered lncRNAs linked to worsening artery disease in progeria syndrome

Scientists have uncovered a previously underappreciated molecular player in one of the most devastating premature aging disorders known to medicine, offering what could become an entirely new avenue for treating the arterial disease that kills children with the condition. Researchers at Karolinska Institutet have identified a constellation of long non-coding RNAs—genetic molecules that do not make proteins but regulate gene expression—that are progressively and selectively dysregulated in the blood vessels of mice carrying the definitive mutation behind Hutchinson-Gilford Progeria Syndrome. The findings, published in the journal GeroScience, provide the most detailed portrait yet of how these regulatory RNA molecules go awry in the arteries of progeria as the disease advances, and they point to a class of therapeutic targets that existing drugs have never touched.

Hutchinson-Gilford Progeria Syndrome, or HGPS, is an extraordinarily rare condition caused by de novo mutations in the LMNA gene, which encodes the structural protein Lamin A, a critical component of the nuclear lamina that gives cells their architectural integrity. More than 90 percent of cases stem from a single silent mutation—c.1824 C>T—that does not change the protein sequence but activates a cryptic splicing site in exon 11 of the gene. The result is the production of progerin, a permanently farnesylated and membrane-anchored mutant form of Lamin A that accumulates in the nuclear envelope, progressively distorting nuclear architecture and cascading into genomic instability, epigenetic drift, mitochondrial dysfunction, and widespread cellular stress. Children with HGPS appear healthy at birth but gradually develop scleroderma-like skin changes, growth failure, skeletal abnormalities, hair loss, and profound subcutaneous fat depletion. Their average life expectancy is just 14.6 years, and in nearly every case, death comes not from any single organ failure but from cardiovascular catastrophe—hearts and arteries that age decades ahead of schedule until a heart attack or stroke proves fatal.

The vasculature is among the most devastated tissues in HGPS, characterized by massive loss of vascular smooth muscle cells, extensive fibrosis, altered extracellular matrix composition, and the paradoxical development of large atherosclerotic plaques even in the absence of elevated blood lipids. Progeria vascular smooth muscle cells have been shown to suffer PARP inactivation, replication stress, and endoplasmic reticulum stress, and many undergo a dramatic phenotypic switch toward fibroblast-like and osteochondrogenic identities—cellular transformations that actively promote plaque formation and arterial stiffening. Despite decades of investigation, no integrative mechanism has emerged to explain the full vascular phenotype, and treatment options remain starkly limited. Lonafarnib, a farnesyltransferase inhibitor and the only FDA-approved drug for HGPS, has extended patient survival but causes significant gastrointestinal side effects and does not prevent the most severe manifestations of the disease.

The new research shifts attention to long non-coding RNAs, or lncRNAs, a vast and heterogeneous family of RNA transcripts longer than 200 nucleotides that are transcribed by RNA polymerase II and processed with 5′ capping, splicing, and 3′ polyadenylation, just like messenger RNAs, but that never encode proteins. Instead, lncRNAs function as master regulators of gene expression through an extraordinarily diverse toolkit of mechanisms: they act as molecular sponges that soak up and neutralize microRNAs, control the stability and degradation of messenger RNAs, serve as structural scaffolds for multi-protein complexes, and recruit transcription factors or chromatin-modifying enzymes to precise genomic loci. LncRNAs have been implicated in numerous types of cardiovascular disease, and with the rapid maturation of RNA-targeting technologies—including antisense oligonucleotides such as LNA GapmeRs, RNA interference strategies using siRNAs and shRNAs, and emerging CRISPR-based systems for RNA degradation and transcriptional modulation—they have become increasingly attractive as druggable targets.

To map the lncRNA landscape in progeria vasculature, the team—led by Lara G. Merino and senior author Maria Eriksson—analyzed a single-cell RNA sequencing dataset generated in their laboratory using the Smart-seq2 platform on enzymatically dissociated cells from the aortic arches of wild-type and LmnaG609G/G609G mice at 6, 10, and 12 weeks of age. These knock-in mice harbor the murine counterpart of the human HGPS-causing mutation and reliably reproduce the core vascular pathology of the human disease, including arterial abnormalities that develop even without a pro-atherogenic environment. The researchers identified five major cell types in the aortic arch—vascular smooth muscle cells, fibroblasts, endothelial cells, pericytes, and macrophages—and further subdivided them into distinct subpopulations based on canonical markers, ultimately focusing on the highly abundant vascular smooth muscle cell and fibroblast compartments for differential lncRNA expression analysis.

The results were striking. Multiple lncRNAs with well-established roles in cardiovascular biology—including Carmn, Dancr, Gas5, Kcnq1ot1, Meg3, Neat1, Pvt1, and Trp53cor1—were significantly dysregulated in progeria vascular smooth muscle cells. Critically, the dysregulation was not uniform across all smooth muscle cells but was most pronounced in a disease-enriched subpopulation showing severe functional deterioration as the animals aged. The lncRNA changes were also dynamic over time, shifting in both identity and magnitude between the 6-week, 10-week, and 12-week time points, suggesting that the regulatory RNA landscape of progeria arteries is not merely a static snapshot of damage but an evolving program that tracks the progressive arterial phenotype. Transcription factor motif enrichment analysis revealed putative regulatory links between these dysregulated lncRNAs and cellular programs governing vascular smooth muscle cell stress responses and phenotypic switching—the very processes known to drive atherosclerosis in progeria.

In contrast to the smooth muscle cell findings, progeria fibroblasts from the aortic arch displayed a completely distinct lncRNA expression profile, with dysregulation of H19, Gas5, Kcnq1ot1, and Pvt1 that correlated with pathways of fibrosis and inflammation rather than smooth muscle dysfunction. This cell type-specificity is a key insight: it means that the lncRNA changes are not simply a global stress response of aging cells but reflect divergent, lineage-specific pathological programs operating in parallel within the same artery. Fibroblasts in progeria have been shown to increase collagen production and become activated, potentially contributing to the adventitial thickening and vascular stiffness that are hallmarks of the disease, and the lncRNA signature identified in this study provides a molecular framework for understanding how those changes are orchestrated.

The implications reach beyond progeria itself. Many of the lncRNAs flagged in this study—Gas5, Meg3, Neat1, H19, and others—have been independently implicated in common cardiovascular disease, vascular calcification, and fibrotic processes affecting the general aging population. A therapeutic strategy that successfully modulates one or more of these RNAs in progeria arteries could therefore illuminate new approaches to vascular aging and atherosclerosis far beyond this rare patient population. The researchers frame their lncRNA catalog as a resource for future preclinical studies, explicitly designed to enable the development of RNA-targeting interventions that could reduce HGPS-associated vascular dysfunction—perhaps through antisense oligonucleotides designed to silence pathological lncRNAs or through approaches that restore protective ones.

What makes this study particularly compelling from a therapeutic standpoint is timing. The RNA-targeting revolution that has already produced approved therapies for other genetic conditions—muscular dystrophy, hereditary transthyretin amyloidosis, and spinal muscular atrophy—is now mature enough to be applied to lncRNAs in cardiovascular contexts. The identification of specific, progressively dysregulated lncRNAs in progeria vascular smooth muscle cells and fibroblasts provides exactly the molecular map that RNA drug developers need. And because the dysregulation is cell type-specific, there is reason to believe that targeted interventions could spare healthy cell populations and focus on the pathological subpopulations where the changes are most severe.

For the children and families affected by HGPS, the findings offer something that has been in short supply: a genuinely new molecular hypothesis. Progerin itself remains the primary driver of vascular smooth muscle cell loss, and blocking its production or effects has been the dominant therapeutic strategy. But the lncRNA data suggest that even after progerin is produced, the downstream regulatory RNA programs that it triggers may represent independent, tractable points of intervention. If those programs can be modulated—silenced, corrected, or redirected—the arterial disease that ultimately claims nearly every patient might be slowed or prevented through a mechanism entirely complementary to existing approaches.

The research also underscores the value of single-cell technologies for rare disease biology. By resolving the aortic arch into individual cell types and subpopulations across three disease stages, the study revealed gradients and trajectories of molecular change that would be invisible in bulk tissue analysis. The exclusion of a low-transcriptional-quality vascular smooth muscle cell subpopulation dominated by unknown predicted transcripts and mitochondrial signals demonstrates the methodological rigor applied, ensuring that the reported lncRNA dysregulations reflect genuine biology rather than technical noise. That level of care matters when the ultimate goal is to nominate specific RNA molecules as targets for drug development in a disease where every therapeutic misstep carries enormous cost.

As HGPS research enters a new era—one shaped by precision RNA therapeutics, single-cell atlases, and an increasingly sophisticated understanding of the non-coding genome—this study marks a turning point. The arteries of children with progeria are now understood not merely as passive victims of a mutant structural protein but as tissues governed by their own progressive, cell type-specific regulatory RNA programs. Those programs, the new evidence shows, can be read, mapped, and potentially rewritten. It is a reframing that transforms the therapeutic question from “how do we block progerin?” to “how do we reprogram the RNA circuitry of an aging artery?”—and for a disease with a median survival of fewer than fifteen years, the urgency of that question could not be greater.