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Genetic variability of the equine casein genes
J Brinkmann1, V Jagannathan2, C Drögemüller2
1Institute of Animal Breeding and Husbandry, Christian-Albrechts-University Kiel, D-24098 Kiel, Germany.
Journal of Dairy Science
|April 25, 2016
Summary
This study explored equine casein genes, revealing 31 predicted protein isoforms, 26 novel ones. This advances understanding of mare milk composition and potential hypoallergenic properties.
Area of Science:
- Animal Genetics
- Dairy Science
- Biochemistry
Background:
- Equine casein gene knowledge is limited despite mare milk's growing importance.
- Mare milk is valued for nutrition, naturopathy, and hypoallergenic properties compared to cow milk.
- Casein genes (CSN1S1, CSN2, CSN1S2, CSN3) are highly variable in dairy species.
Purpose of the Study:
- To resequence and analyze the 4 casein genes in horses.
- To identify genetic variations and predict protein isoforms in equine casein.
- To establish a preliminary nomenclature for equine casein alleles.
Main Methods:
- Resequencing of the open reading frames of CSN1S1, CSN2, CSN1S2, and CSN3 genes.
- Analysis of nucleotide exchanges in 253 horses across 14 breeds.
- Prediction of protein isoforms at the DNA level.
Main Results:
- Identified 21 nonsynonymous and 11 synonymous nucleotide exchanges.
- Predicted 31 putative protein isoforms, with 26 identified as novel.
- Established a preliminary nomenclature for equine casein alleles.
Conclusions:
- Significant genetic variability exists within equine casein genes.
- The findings provide a foundation for further research into mare milk protein function and applications.
- Further confirmation at transcript and protein levels is warranted.
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