Polymorphisms in PTK2 are associated with skeletal muscle specific force: an independent replication study

Area of Science:

• Human Physiology
• Genetics
• Molecular Biology

Background:

• Muscle strength varies significantly between individuals.
• Genetic factors are known to influence muscle function.
• The PTK2 gene has been implicated in cellular processes relevant to muscle.

Purpose of the Study:

• To investigate the association between two single nucleotide polymorphisms (SNPs) in the PTK2 gene and muscle strength phenotypes in healthy Caucasian men.
• To explore the genetic underpinnings of inter-individual differences in muscle specific force.

Main Methods:

• 120 healthy Caucasian men underwent measurements of maximal isometric voluntary knee extension (MVC_KE) torque and vastus lateralis (VL) specific force.
• DNA was isolated from blood or buccal samples and genotyped for PTK2 SNPs rs7843014 and rs7460 using real-time polymerase chain reaction.

Main Results:

• Genotype frequencies for both SNPs were in Hardy-Weinberg equilibrium.
• Individuals with the rs7843014 AA genotype exhibited 8.3% higher VL specific force compared to C-allele carriers (P=0.017).
• Individuals with the rs7460 AA genotype showed 5.4% higher VL specific force compared to T-allele carriers (P=0.029).
• No significant associations were found between these SNPs and peak or net MVC_KE torque.

Conclusions:

• The study identifies a genetic contribution of PTK2 SNPs to variations in muscle specific force.
• These findings provide independent replication in a larger cohort, supporting the role of PTK2 genetic variation in intrinsic muscle strength.
• This research enhances the understanding of how genetic factors influence human muscle performance.