DNA Damage as a Driver for Growth Delay: Chromosome Instability Syndromes with Intrauterine Growth Retardation

Area of Science:

• Genetics
• Molecular Biology
• Cell Biology

Background:

• DNA is susceptible to damage from internal and external factors.
• Evolved DNA repair systems and the DNA damage response (DDR) protect genetic material.
• Mutations in DDR genes impair repair, leading to genomic instability.

Purpose of the Study:

• To explore the consequences of constitutional alterations in the DNA damage response (DDR).
• To investigate the link between DDR, genomic instability, and clinical phenotypes like cancer and growth retardation.
• To identify unifying features in chromosome instability syndromes (CIS) associated with intrauterine growth retardation.

Main Methods:

• Analysis of clinical phenotypes.
• Evaluation of cellular responses to DNA damage.
• Molecular characterization of affected individuals and pathways.

Main Results:

• Constitutional DDR alterations result in pervasive DNA damage and genomic instability from development.
• Cellular responses diverge into uncontrolled proliferation (overgrowth) or apoptosis/senescence (hypoplasia).
• Chromosome instability syndromes (CIS) exhibit both cancer and growth retardation, with replication alteration as a common feature.

Conclusions:

• Altered DNA damage response (DDR) pathways are central to genomic instability.
• Divergent cellular outcomes of DDR defects explain diverse clinical manifestations, including cancer and growth retardation.
• Replication alteration is a unifying molecular mechanism in chromosome instability syndromes (CIS) with intrauterine growth retardation.