Epigenetics, genomic imprinting and assisted reproductive technology

Area of Science:

• Epigenetics
• Genomic imprinting
• Developmental biology

Background:

• DNA methylation is a key epigenetic mechanism regulating gene expression, particularly at imprinted loci.
• Genomic imprinting involves parental origin-dependent monoallelic gene expression, crucial for normal development.
• Improper maintenance of DNA methylation marks can lead to imprinting disorders, such as Beckwith-Wiedemann (BWS) and Silver-Russell (SRS) syndromes.

Purpose of the Study:

• To investigate the link between assisted reproductive technology (ART) and epigenetic alterations in imprinting.
• To explore the potential causes of imprinting disorders in ART-conceived individuals.
• To identify imprinted loci affected by DNA methylation defects in ART-associated imprinting disorders.

Main Methods:

• Review of existing literature on epigenetic reprogramming, genomic imprinting, and ART.
• Analysis of DNA methylation patterns in patients with BWS and SRS, including those conceived via ART.
• Examination of imprinted loci beyond the 11p15 region in affected individuals.

Main Results:

• ART is associated with a higher incidence of imprinting disorders like BWS.
• DNA methylation defects in ART-conceived patients with BWS/SRS involve imprinted loci beyond 11p15.
• These defects suggest a potential dysregulation of trans-acting factors involved in DNA methylation maintenance.

Conclusions:

• ART may interfere with the faithful maintenance of DNA methylation marks during early development.
• Epigenetic imprinting disorders following ART could stem from altered regulatory factors.
• Further research is needed to elucidate the precise mechanisms by which ART impacts imprinting and to identify specific risk factors.