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Proteases play a significant role in milk and its products by affecting flavor, texture and longevity. The expression of endogenous proteases varies across different stages of lactation. The study was conducted to understand the transcriptional pattern of different classes of protease-pathways associated genes ( CTSB ,  CTSD ,  CTSH ,  CTSL ,  CTSK ,  CTSS ,  CTSZ ,  PLAU ,  PLAT ) and potential protease inhibitors ( SERPIN E2  and  SERPIN F2 ) in 40 milk somatic cells (MSC) samples isolated during early, peak, mid and late lactation stages of Sahiwal cows and Murrah buffaloes – the two most important dairy breeds of India. In Sahiwal cows, except  CTSK  and  PLAU , the expression of other proteases class was not affected significantly ( p  &gt; 0.05) across lactation stages. However, in Murrah buffaloes, the expression of different proteases increased as the lactation progressed. Most of the proteases showed lower expression during early and peak lactation stages while their expression tends to increase during mid to late lactation stages. The overall trend was somewhat similar in both the dairy species albeit the level of expression was higher in buffalo MSC as compared to cow MSC. The study has provided valuable information on expression kinetics of different proteases in milk somatic cells of two major dairy breeds of India.

animal biotechnology

Expression profile of different classes of proteases in milk derived somatic cells across different lactation stages of indigenous cows ( Bos indicus ) and riverine buffaloes ( Bubalus bubalis )