Genetic Mechanisms of Overgrowth Syndromes
Summary
Overgrowth syndromes comprise a heterogeneous group of disorders characterised by excessive somatic growth, often accompanied by congenital anomalies, organomegaly and elevated tumour risk. At the molecular level, three principal mechanisms have emerged: dysregulation of genomic imprinting, activating mutations in growth-regulatory signalling cascades and loss of function in tumour-suppressor genes. In imprinting disorders such as Beckwith–Wiedemann syndrome, aberrant methylation or uniparental disomy at the 11p15 locus leads to overexpression of IGF2 or silencing of CDKN1C, tipping the balance towards unchecked proliferation. Mosaic activating variants in the PIK3CA gene underlie a spectrum of segmental overgrowth conditions; these somatic mutations hyperactivate the PI3K–AKT–mTOR pathway and confer localised tissue enlargement. Germline disruption of proteoglycan-encoding genes, notably GPC3 in Simpson–Golabi–Behmel syndrome, impairs normal regulation of growth factor signalling in early development. In addition, loss-of-function mutations in PTEN and related tumour-suppressor loci give rise to hamartoma syndromes that combine overgrowth with tumour predisposition. Together, these molecular insights have paved the way for precision diagnostics, refined genotype–phenotype correlations and the emerging application of pathway-targeted therapies in selected cases.
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Genetic Mechanisms of Overgrowth Syndromes publication trend
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Technical terms
Genomic imprinting: Parent-specific DNA methylation controlling monoallelic gene expression.
Uniparental disomy: Inheritance of both homologues of a chromosome from one parent, disrupting imprinted gene dosage.
Mosaicism: Presence of two or more genetically distinct cell populations within an individual.
PI3K–AKT–mTOR pathway: Intracellular signalling cascade that regulates cell growth, metabolism and survival.
Copy-number variation: Gains or losses of genomic segments that can alter gene dosage and function.
Proteoglycan: Glycoprotein with covalently attached glycosaminoglycan chains, involved in growth-factor regulation.
References
- Simpson-Golabi-Behmel syndrome types I and II. Orphanet Journal of Rare Diseases (2014).
- Overgrowth Syndromes—Evaluation, Diagnosis, and Management. Frontiers in Pediatrics (2020).
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