Hirayama H, Kageyama S, Moriyasu S, Sawai K, Minamihashi A. Embryo sexing and sex chromosomal chimerism analysis by loop-mediated isothermal amplification in cattle and water buffaloes.
J Reprod Dev 2014;
59:321-6. [PMID:
23965599 PMCID:
PMC3944364 DOI:
10.1262/jrd.2013-028]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In domestic animals of the family Bovidae, sex preselection of offspring has been
demanded for convenience of milk/beef production and animal breeding. Development of the
nonsurgical embryo transfer technique and sexing methods of preimplantation embryos made
it possible. Sexing based on detection of Y chromosome-specific DNA sequences is
considered the most reliable method to date. PCR enables amplification of a target
sequence from a small number of blastomeres. However, it requires technical skill and is
time consuming. Furthermore, PCR has the risk of false positives because of DNA
contamination during handling of the PCR products in duplicate PCR procedures and/or
electrophoresis. Therefore, for embryo sexing to become widely used in the cattle embryo
transfer industry, a simple, rapid and precise sexing method needs to be developed.
Loop-mediated isothermal amplification (LAMP) is a novel DNA amplification method, and the
reaction is carried out under isothermal conditions (range, 60 to 65 C) using DNA
polymerase with strand displacement activity. When the target DNA is amplified by LAMP, a
white precipitate derived from magnesium pyrophosphate (a by-product of the LAMP reaction)
is observed. It is noteworthy that LAMP does not need special reagents or electrophoresis
to detect the amplified DNA. This review describes the development and application of an
embryo sexing method using LAMP in cattle and water buffaloes.
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