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Title: Technical note: A simplified PCR-based assay for the characterization of two prolactin variants that affect milk traits in sheep breeds
Authors: Orford, Michael R. 
Tzamaloukas, Ouranios 
Miltiadou, Despoina 
Papachristoforou, Christakis 
Keywords: Genotyping;Marker assisted selection;Polymerase chain reaction–restriction fragment length polymorphism;Prolactin
Category: Biological Sciences
Field: Natural Sciences
Issue Date: 2010
Publisher: Elsevier Inc.
Source: Journal of Dairy Science, Volume 93, Issue 12, December 2010, Pages 5996-5999
Abstract: In the present study, a rapid and cost-effective PCR-based assay was developed for the genetic identification of 2 different variants within intron 2 of the prolactin gene. This polymorphism has previously been associated with milk traits in some ovine breeds and was recently proposed as a potential marker for future breeding schemes in dairy sheep. Until now, 2 alleles (A and B) have been identified by PCR-RFLP that included HaeIII digestion of a 2.5-kb PCR fragment. By partial sequencing of the prolactin gene intron 2, it was found that the B variant results from a 23-bp deletion of the A variant of the prolactin gene and not from an extra HaeIII digestion site, as had been reported. This finding assisted the design of new primers for analysis of prolactin intron 2 variants based on the size of an easily amplified short PCR product, thereby avoiding the need and cost for additional digestions. The method was validated by genotyping 80 animals from 2 breeds and showed 100% sensitivity and specificity compared with the PCR-RFLP assay. The established simplified PCR assay was then successfully used to genotype 356 Chios sheep.
ISSN: 0022-0302
DOI: 10.3168/jds.2010-3569
Rights: Copyright © 2010 American Dairy Science Association Published by Elsevier Inc.
Type: Article
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