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Gewählte Publikation:

Publikationstyp: Zeitschriftenaufsatz
Dokumenttyp: Originalarbeit

Jahr: 2012

AutorInnen: Beckelmann, J; Budik, S; Bartel, C; Aurich, C

Titel: Evaluation of Xist expression in preattachment equine embryos.

Quelle: Theriogenology. 2012; 78(7):1429-1436

Autor/innen der Vetmeduni Vienna:

Aurich Christine
Beckelmann Jana
Budik Sven
Gabriel Cordula

Beteiligte Vetmed-Organisationseinheiten
Institut für Topographische Anatomie
Plattform Besamung und Embryotransfer

Until now, sex determination in equine embryos has been performed by detection of Y-chromosome-specific sequences only. In the present study, expression of a Barr-body-specific marker, the X-inactivated-specific transcript (Xist) gene, whose gene product consists of RNA which coats and thereby inactivates one of the X chromosomes, was investigated in equine embryos produced in vivo. Preattachment embryos at different times after ovulation (Day 8: n = 9; Day 10: n = 12; Day 12: n = 15) were analyzed for Xist RNA expression using quantitative and qualitative reverse transcription-polymerase chain reaction (RT-PCR). Female and male primary equine dermal cell cultures were used as positive and negative controls, respectively. Embryos tested negative for Xist were evaluated for expression of the male-specific eSRY gene by qualitative PCR at the DNA level. From 36 embryos assessed by qualitative RT-PCR, 18 showed positive Xist expression (50%). From 29 embryos tested by quantitative RT-PCR, 16 showed positive Xist expression (55%). All of the Xist-negative equine embryos tested by quantitative PCR were positive for eSRY. We also demonstrated by strand-specific RT-PCR that in the horse, as in humans, the counter transcript Tsix seems to be truncated not reaching Exon 1. In contrast to many other species, neither Xist nor Tsix was expressed in equine male testicular tissue. The results demonstrate that expression of Xist is restricted to female equine embryos. Xist can thus be considered an X-inactivation-specific marker which can be used in concert with Y-specific markers for sex determination.

Keywords Pubmed: Animals
Dosage Compensation, Genetic
Embryonic Development/genetics
Gene Expression
Polymerase Chain Reaction
RNA, Long Noncoding/analysis
RNA, Long Noncoding/genetics*
Reverse Transcriptase Polymerase Chain Reaction
Sex Determination Analysis/methods
Sex Determination Analysis/veterinary*
Sex-Determining Region Y Protein/genetics
X Chromosome Inactivation/genetics*

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