Molecular Aspects of Rare Coagulation Factor Deficiencies

Area of Science:

• Hematology
• Genetics
• Molecular Biology

Background:

• Rare coagulation factor deficiencies (Factors I, II, V, VII, X, XI, XIII) are inherited disorders.
• These conditions manifest as bleeding symptoms with variable severity and clinical heterogeneity.
• Prevalence is higher in consanguineous populations, necessitating genetic understanding.

Purpose of the Study:

• To elucidate the genetic and molecular mechanisms underlying rare coagulation factor deficiencies.
• To detail diagnostic approaches, including hemostasis testing and molecular analysis.
• To characterize mutation types and their impact on bleeding phenotypes.

Main Methods:

• Hemostasis testing: Prothrombin time (PT), activated partial thromboplastin time (aPTT), factor activity assays.
• Molecular analysis: Genomic DNA sequencing (Sanger, Next-Generation Sequencing - NGS), Multiplex Ligation-dependent Probe Amplification (MLPA), Copy Number Variation (CNV) analysis.
• Variant interpretation using American College of Medical Genetics and Genomics (ACMG)/Association for Molecular Pathology (AMP) guidelines.

Main Results:

• Identified diverse mutations (missense, nonsense, splicing, insertion/deletion) across different deficient factors.
• Demonstrated that mutations can affect factor production, structure, or secretion.
• Established a correlation between mutation type and bleeding phenotype severity.

Conclusions:

• Genetic characterization significantly enhances diagnostic accuracy for coagulation disorders.
• Molecular tools provide deeper insights into pathophysiology, aiding clinical management.
• A multidisciplinary approach and ongoing research are crucial for developing targeted therapies.