Genetic Mechanisms in Robinow Syndrome

Robinow syndrome is a rare skeletal dysplasia marked by mesomelic limb shortening, characteristic craniofacial features and genital hypoplasia. It arises from mutations in components of Wnt signalling pathways, most prominently ROR2, WNT5A, FZD2 and Dishevelled proteins (DVL1/3). Autosomal recessive forms are typically caused by biallelic loss‐of‐function variants in ROR2, whereas autosomal dominant cases often involve heterozygous frameshift or missense alleles in non-canonical Wnt effectors. Disruption of non-canonical Wnt signalling impairs chondrocyte polarity, osteoblast differentiation and coordinated bone growth. ROR2 acts as a receptor tyrosine kinase-like orphan receptor for WNT5A, orchestrating planar cell polarity, while Frizzled receptors mediate both β-catenin-dependent and independent pathways. DVL adaptor proteins transmit signals from the membrane to cytosolic effectors. Crosstalk with BMP/TGF-β morphogens further refines skeletal patterning. Recent advances have clarified the structural basis of ligand–receptor interactions, the impact of pathogenic variants on signal transduction, and potential pharmacological strategies to restore balanced pathway activity. These insights enhance molecular diagnosis, inform prenatal screening and may guide targeted therapies for Robinow syndrome and related bone disorders.

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Genetic Mechanisms in Robinow Syndrome publication trend

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Technical terms

Robinow syndrome: A genetically heterogeneous skeletal dysplasia characterised by limb shortening, craniofacial anomalies and genital hypoplasia due to mutations in Wnt pathway components.

Non-canonical Wnt signalling: A β-catenin-independent branch of Wnt signalling that regulates cell polarity and directional growth through receptors such as ROR2 and Frizzled.

ROR2: Receptor tyrosine kinase-like orphan receptor 2, a non-canonical Wnt co-receptor that binds WNT5A to modulate planar cell polarity and osteogenesis.

Cysteine-rich domain (CRD): The extracellular ligand-binding region of ROR2 and Frizzled receptors essential for Wnt recognition and receptor activation.

Frizzled (FZD) receptors: A family of seven-pass transmembrane proteins that mediate both canonical and non-canonical Wnt signalling to control cell fate and polarity.

BMP/TGF-β signalling: A key morphogenetic pathway involved in bone development that interacts with Wnt cascades to regulate chondrocyte differentiation and proliferation.

References

1. ROR2-Related Skeletal Dysplasia Reveals Disrupted Chondrocyte Polarity through Modulation of BMP/TGF-β Signaling. Aging and Disease (2024).
2. Structure and function of the ROR2 cysteine-rich domain in vertebrate noncanonical WNT5A signaling. eLife (2024).
3. DVL3 Alleles Resulting in a −1 Frameshift of the Last Exon Mediate Autosomal-Dominant Robinow Syndrome. American Journal of Human Genetics (2016).
4. FRIZZLED 2 regulates limb development by mediating both β-catenin-dependent and independent Wnt signaling pathways. Disease Models & Mechanisms (2023).