Ponies have a maximum height of 148 centimetres. When the height at the withers is greater, they are deemed to be large horses. Scientists at the Institute for Animal Breeding and Genetics at University of Veterinary Medicine Hannover (TiHo) have investigated genetic causes for different body sizes in horses and found a gene with a very strong impact on size.
The researchers compared thousands of genetic variations between ponies and larger horses to determine whether a specific mutation is responsible for size differences in horses. Such point mutations on single nucleotide polymorphisms (SNPs) are the most common causes of genetic variations. Scientists then used gene expression analysis to identify a gene that has a crucial effect on the size development of horses. The results have been published in PloS One, an international specialised journal, at http://dx.plos.org/10.1371/journal.pone.0056497.
The growth of the horses is determined by a mutation that influences the LCORL (ligand-dependent nuclear receptor compressor-like protein) gene. This mutation has the effect that the gene is not read as often in large horses as it is in ponies. "We conclude from these findings that LCORL limits size growth in horses. The more strongly LCORL is expressed, the smaller the horses are" said Professor Dr Ottmar Distl, the head of the Institute for Animal Breeding and Genetics at TiHo. All original Przewalski wild horses carried the pony mutation and purebred Arab horses also have only this genetic variant.
Warmblood horses show a greater variation of the height at the withers and have a great genetic variation. Almost half of this variation is due to regulatory mutation affecting LCORL. The smaller warmblood horses are homozygous for the pony mutation. Warmblood horses in the medium-sized range carry both genetic variants and are therefore heterozygous, while large warmblood horses are homozygous for the large horse mutation.
The large coldblood horse breeds such as the Rhenish-German Coldblood, the Saxon-Thuringia Coldblood, the Noriker and the South-German Coldblood do not include animals with the homozygous pony mutation and only a few of them are heterozygous. "The distribution of the pony mutation in the different horse breeds suggests that the mutation prevailing in large horses arose during the domestication of horses in Western Europe," explained Professor Distl.
LCORL influences the torso and hip length in humans, but does not act as a major regulator for size. However, scientists assume that LCORL has a very strong effect on the size of horses. There are also other genes involved in the complex characteristic "body size" and the scientists plan to investigate these genes in further studies.
Horse breeders can use these new findings for their breeding decisions. The Institute for Animal Breeding and Genetics at TiHo offers gene testing for this purpose. Further information is provided on the institute's website: www.tiho-hannover.de/kliniken-institute/institute/institur-fuer-tierzucht-und-vererbungsforschung /dienstleistungen/gentest/gentests-pferd/
For specialised queries, please contact:Professor Dr. Ottmar Distl
Sonja von Brethorst | idw
New 3-D model predicts best planting practices for farmers
26.06.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign
Fighting a destructive crop disease with mathematics
21.06.2017 | University of Cambridge
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
24.07.2017 | Power and Electrical Engineering
24.07.2017 | Materials Sciences
24.07.2017 | Materials Sciences