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Casein composition and differential translational efficiency of casein transcripts in donkey's milk

Published online by Cambridge University Press:  30 April 2019

Gianfranco Cosenza*
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Rosalba Mauriello
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Giuseppina Garro
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Barbara Auzino
Affiliation:
Department of Veterinary Sciences, University of Pisa, Pisa, Italy
Marco Iannaccone
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Angela Costanzo
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Lina Chianese
Affiliation:
Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy
Alfredo Pauciullo
Affiliation:
Department of Agricultural, Forest and Food Science, University of Torino, Grugliasco (TO), Italy
*
Author for correspondence: Gianfranco Cosenza, Email: giacosen@unina.it

Abstract

The amount of the four caseins (αs1, αs2, β and κ-CN) in donkey milk was evaluated by Urea-PAGE analysis at pH 8.6, followed by immuno-detection with polyclonal antibodies, coupled to densitometric analysis. The results showed the percentage of each casein in decreasing order: β (54.28) > αs1 (35.59) > αs2 (7.19) > κ-CN (2.79). The mRNA quantification of donkey casein transcripts, carried out by RT-qPCR, showed that the average percentage of corresponding gene transcripts (CSN2, CSN1S1, CSN1S2 I and CSN3) was 70.85, 6.28, 14.23 and 8.65, respectively. The observed translation efficiency, assessed as percentage of single milk casein fraction out of single percentage of transcript, was 0.76, 5.66, 0.50 and 0.32, respectively. The analysis of the sequences flanking the start codon, the codon usage frequencies and the coding sequence length might explain, at least in part, the differential transcriptional and translational rate observed among the casein transcripts.

Information

Type
Research Article
Copyright
Copyright © Hannah Dairy Research Foundation 2019 

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