Genetic and Biomechanical Factors in Adolescent Idiopathic Scoliosis

Adolescent idiopathic scoliosis (AIS) is a complex three-dimensional deformity of the spine emerging around puberty, with a pronounced female bias and a global prevalence that imposes substantial clinical and socioeconomic burdens. Its aetiology reflects an interplay between multiple genetic loci and biomechanical influences on the growing spine. Genetic predisposition is characterised by polygenic risk variants affecting transcription factors, extracellular matrix components and neurotransmitter pathways. Key genes implicated include PAX1, LBX1 and SLC39A8, among others, and cis-regulatory elements modulating their expression. Biomechanical contributors encompass asymmetrical loading of the vertebral column, paraspinal muscle imbalance, altered bone mineral density and neuromuscular control of posture via central pattern generators and cerebrospinal fluid dynamics. Together, these factors disrupt normal spinal growth, leading to lateral curvature and vertebral rotation. Improved understanding of molecular mechanisms and mechanical compensation has refined prognostic markers, guided targeted physiotherapy and opened avenues for pharmacological intervention aimed at neurotransmission and hormone receptor pathways. Integrating genetic screening with biomechanical assessment promises earlier risk stratification and personalised management, alleviating progression to severe deformity and reducing reliance on invasive surgery.

Research from Nature Portfolio

Recent genomic investigations have delineated multiple susceptibility loci that underpin the heritable component of AIS. Functional characterisation of a female-specific PAX1 enhancer revealed its role in somitic muscle and spinal cord cells, with risk-associated alleles diminishing enhancer activity and conferring sex-biased susceptibility. A large-scale genome-wide association study in East Asian cohorts uncovered novel risk regions near AJAP1, PAX3–EPHA4 and BCL2, expanding the catalogue of AIS loci and highlighting tissue-specific regulatory networks. A subsequent meta-analysis integrated multiple cohorts to identify additional loci explaining a greater fraction of heritability, underscoring the heterogeneous and polygenic nature of AIS and providing new molecular entry points for mechanistic studies.

Genetic and Biomechanical Factors in Adolescent Idiopathic Scoliosis publication trend

The graph below shows the total number of articles in genetic and biomechanical factors in adolescent idiopathic scoliosis across all publications each year (not limited to Nature Index journals).

Technical terms

Genome-wide association study (GWAS): Unbiased scan of common genetic variants across the genome to identify loci associated with a trait.

Single-nucleotide polymorphism (SNP): A single base-pair change in DNA sequence, which may influence gene function or expression.

Cobb angle: The standard measure of spinal curvature in scoliosis, defined by the angle between the most tilted vertebrae.

Paraspinal muscles: Muscles running alongside the spine that stabilise and move the vertebral column.

Osteopenia: Reduced bone mineral density below normal but above osteoporotic thresholds, affecting bone strength.

Enhancer: A non-coding DNA sequence that regulates gene transcription at a distance.

Central pattern generator (CPG): Neural circuits that produce rhythmic motor patterns, such as those controlling posture and gait.

Glycine transporter (GLYT1): A protein responsible for uptake of the neurotransmitter glycine into synaptic cells, regulating inhibitory transmission.

Estrogen receptor 1 (ESR1): A nuclear hormone receptor that binds oestrogen, modulating gene expression in target tissues.

References

1. Impaired glycine neurotransmission causes adolescent idiopathic scoliosis. Journal of Clinical Investigation (2024).
2. The asymmetrical ESR1 signaling in muscle progenitor cells determines the progression of adolescent idiopathic scoliosis. Cell Discovery (2023).
3. Deletion of Pax1 scoliosis-associated regulatory elements leads to a female-biased tail abnormality. Cell Reports (2024).
4. A PAX1 enhancer locus is associated with susceptibility to idiopathic scoliosis in females. Nature Communications (2015).
5. Genome-wide association study identifies new susceptibility loci for adolescent idiopathic scoliosis in Chinese girls. Nature Communications (2015).
6. A missense variant in SLC39A8 is associated with severe idiopathic scoliosis. Nature Communications (2018).
7. Prognostic Value of Bone Mineral Density on Curve Progression: A Longitudinal Cohort Study of 513 Girls with Adolescent Idiopathic Scoliosis. Scientific Reports (2016).
8. Etiological Theories of Adolescent Idiopathic Scoliosis: Past and Present. The Open Orthopaedics Journal (2017).