Causes and consequences of DNA single-strand breaks

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• DNA single-strand breaks (SSBs) are frequent DNA lesions occurring daily in human cells.
• Efficient cellular mechanisms exist for sensing and repairing SSBs.
• Defects in SSB repair (SSBR) are associated with severe human diseases.

Purpose of the Study:

• To review the origins and cellular impact of DNA single-strand breaks.
• To explore the connection between SSBs and critical molecular processes like DNA replication and gene transcription.
• To elucidate the links between SSBR defects and human pathologies.

Main Methods:

• Literature review of current understanding on DNA single-strand breaks.
• Analysis of molecular processes affected by SSBs.
• Examination of genetic diseases linked to SSB repair deficiencies.

Main Results:

• SSBs arise frequently and can impede DNA replication and gene transcription.
• At least six genetic diseases are characterized by defective SSB repair (SSBR).
• These SSBR-defective diseases manifest as neurodevelopmental and/or neurodegenerative disorders.

Conclusions:

• SSBs are a significant threat to genomic integrity.
• Proper functioning of SSB repair (SSBR) is crucial for preventing neurodevelopmental and neurodegenerative diseases.
• Further research into SSBR mechanisms is vital for understanding and treating associated human pathologies.