Annotating rare variants: A challenge that has not been completely resolved

Area of Science:

• Genetics and Genomics
• Rare Diseases
• Molecular Diagnostics

Background:

• Significant progress in rare disease molecular diagnosis and management since the mid-1980s, driven by molecular genetics and genome research.
• Whole genome sequencing is now integrated into patient care due to simplified techniques and investment in genome structure understanding.

Purpose of the Study:

• To review human genome organization.
• To discuss challenges in confirming DNA variant pathogenicity.
• To illustrate these challenges using congenital gonadotropin deficiency as an example.

Main Methods:

• Review of advancements in molecular genetics and genomic sequencing techniques.
• Analysis of the current limitations in variant interpretation.
• Case study approach using congenital gonadotropin deficiency.

Main Results:

• While genome sequencing is accessible, determining the clinical significance of identified DNA variants is the primary hurdle.
• The complexity of linking specific genetic variants to observed phenotypes is increasingly apparent.

Conclusions:

• The focus in genetic diagnostics has shifted from sequencing to variant interpretation.
• Confirming pathogenicity of DNA variants is crucial for effective patient management, particularly in rare genetic disorders like congenital gonadotropin deficiency.