Variability of lysozyme and lactoferrin bioactive protein concentrations in equine milk in relation to LYZ and LTF gene polymorphisms and expression.

The research article abstract suggests a study on the variability of lysozyme and lactoferrin bioactive proteins in equine milk, in relation to gene polymorphisms and expression. The key findings were that the horse breed, lactation stage, and specific gene polymorphisms can significantly affect the concentration of these proteins in horse milk.

Study Focus and Methods

• The focus of the study was equine milk, which is considered beneficial for human nutrition due to its low allergenicity and significant amounts of bioactive proteins lysozyme (LYZ) and lactoferrin (LTF).
• The researchers set out to examine the effect of genetic factors, specifically polymorphisms in the LYZ and LTF genes, on the concentration variability of these proteins.
• They recorded and compared the levels of both proteins across different horse breeds and stages of lactation.

Key Findings

• The study observed significant variations in milk LYZ and LTF contents based on the breed of the horse and the stage of lactation.
• Among the breeds, the highest levels of LTF and the lowest LYZ were found in the Polish Warmblood Horse breed.
• The researchers recorded the highest protein levels at the earliest point of the lactation stage investigated, the 5th week.
• They established 13 polymorphisms in the 5′-flanking regions of both genes, including nine novel ones. However, these genetic variations showed no significant relationship with the milk’s LYZ and LTF contents.
• Despite this, several connections were found between selected single nucleotide polymorphisms (SNPs) and the relative transcript level of the LYZ gene.

Conclusions and Implications

• While the study revealed intra- and interbreed variability in LYZ and LTF contents in horse milk, this variation wasn’t linked to the 5′-flanking variants of the genes encoding both proteins.
• This study acts as a foundational basis for broader investigations into the genetic influences on the variability of bioactive protein contents in horse milk.