Genotype-Phenotype Correlations in ATTR Amyloidosis: A Clinical Update

Area of Science:

• Genetics
• Neurology
• Cardiology

Background:

• Hereditary transthyretin-related amyloidosis (hATTR) is the most prevalent familial amyloidosis.
• It is an autosomal dominant disorder stemming from pathogenic variants in the TTR gene.
• Over 140 TTR variants are linked to hATTR, with Val30Met being the most frequent globally.

Purpose of the Study:

• To elucidate the genotype-phenotype correlations in hereditary transthyretin-related amyloidosis.
• To provide a comprehensive overview of how TTR gene variants influence clinical presentation.
• To emphasize the importance of understanding these correlations for clinical practice.

Main Methods:

• Systematic review of existing literature on TTR gene variants and associated phenotypes.
• Analysis of reported genotype-phenotype data in hATTR patients.
• Synthesis of information regarding cardiac, neurologic, and mixed clinical presentations.

Main Results:

• Significant variability in clinical phenotypes (cardiac, neurologic, mixed) based on specific TTR gene variants.
• The Val30Met variant is the most common cause of hATTR worldwide.
• Over 140 distinct TTR variants have been identified, each potentially leading to different disease manifestations.

Conclusions:

• Genotype-phenotype correlations are critical for early hATTR identification and prognosis.
• Understanding these links aids in predicting disease progression and patient outcomes.
• This knowledge is essential for guiding management strategies with available disease-modifying therapies.