Human Reproduction and Disturbed Genomic Imprinting

Area of Science:

• Genetics
• Developmental Biology
• Reproductive Medicine

Background:

• Genomic imprinting is a critical gene regulation mechanism influencing fetal development and maternal health.
• Disturbances in genomic imprinting lead to imprinting disorders (ImpDis) in children and affect placental function, impacting pregnancy outcomes.
• Aberrant imprinting signatures are linked to various complications, including miscarriage, aneuploidy, maternal health issues, and ImpDis in offspring.

Purpose of the Study:

• To review the current knowledge on the molecular causes of aberrant genomic imprinting signatures.
• To highlight the importance of identifying these molecular causes for personalized genetic and reproductive counseling.

Main Methods:

• Review of existing literature on genomic imprinting, imprinting disorders, and imprinting defects.
• Analysis of molecular causes, including DNA-level changes and methylation disturbances.
• Discussion of clinical implications and the need for specific diagnostic workups.

Main Results:

• Molecular causes of ImpDis involve DNA alterations and methylation defects (imprinting defects/ImpDefs), which can be inherited from either parent.
• Prediction of pregnancy complications arising from ImpDefs is challenging due to their diverse effects.
• The complexity of imprinting regulation necessitates individualized assessment for each suspected case.

Conclusions:

• Identifying the precise molecular basis of aberrant imprinting is essential for accurate diagnosis and management.
• Personalized genetic and reproductive counseling requires a thorough understanding of the underlying imprinting defects.
• Further research is needed to improve the prediction and management of pregnancy complications associated with imprinting disorders.