1. bookVolume 18 (2018): Issue 1 (January 2018)
Journal Details
First Published
25 Nov 2011
Publication timeframe
4 times per year
access type Open Access

Genetic variability in equine GDF9 and BMP15 genes in Arabian and Thoroughbred mares

Published Online: 30 Jan 2018
Volume & Issue: Volume 18 (2018) - Issue 1 (January 2018)
Page range: 39 - 52
Received: 08 Dec 2016
Accepted: 31 Oct 2017
Journal Details
First Published
25 Nov 2011
Publication timeframe
4 times per year

In horses, multiple ovulation resulting in implantation of multiple embryos is adverse. However, understanding the mechanisms underlying initiation of multiple ovulation (MO) is advantageous and is related to an increase in efficiency of embryo transfer techniques. It has been postulated that MO may have a genetic background. Two major genes: bone morphogenetic protein 15 (BMP15) and growth and differentiation factor 9 (GDF9) are considered to play a crucial role in folliculogenesis and controlling the ovulation rate. Thus, the aim of the presented study was to identify the variation within equine BMP15 and GDF9 genes to verify their potential role on spontaneous, repetitive multiple ovulations in mares. In addition, variation screening of investigated genes in population of Thoroughbred and Arabian breeds was performed together with establishment of transcript abundance of BMP15 and GDF9 genes in equine ovarian tissue. Sanger sequencing of Arabian and Thoroughbred mares divided according to ovulation rate, revealed occurrence of 3 SNPs in BMP15 and STS in GDF9 genes. The PCR-RLFP and statistical analysis indicated that none of the genotype frequencies were significant in any breeds and none of them were claimed as functional according to ovulation rate. Furthermore, evaluation of transcript abundance by RT -PCR of both genes in ovarian tissues showed that expression of both genes was similar but GDF9 was significantly expressed in growing follicles with 21-30 mm diameter and in ovarian parenchyma, which suggest their potential role in folliculogenesis.


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