A genomic prediction model for racecourse starts in the Thoroughbred horse
ANIMAL GENETICS
Authors: McGivney, B. A.; Hernandez, B.; Katz, L. M.; MacHugh, D. E.; McGovern, S. P.; Parnell, A. C.; Wiencko, H. L.; Hill, E. W.
Abstract
Durability traits in Thoroughbred horses are heritable, economically valuable and may affect horse welfare. The aims of this study were to test the hypotheses that (i) durability traits are heritable and (ii) genetic data may be used to predict a horse's potential to have a racecourse start. Heritability for the phenotype 'number of 2- and 3-year-old starts' was estimated to be hm2 = 0.11 +/- 0.02 (n = 4499). A genome-wide association study identified SNP contributions to the trait. The neurotrimin (NTM), opioid-binding protein/cell adhesion molecule like (OPCML) and prolylcarboxypeptidase (PRCP) genes were identified as candidate genes associated with the trait. NTM functions in brain development and has been shown to have been selected during the domestication of the horse. PRCP is an established expression quantitative trait locus involved in the interaction between voluntary exercise and body composition in mice. We hypothesise that variation at these loci contributes to the motivation of the horse to exercise, which may influence its response to the demands of the training and racing environment. A random forest with mixed effects (RFME) model identified a set of SNPs that contributed to 24.7% of the heritable variation in the trait. In an independent validation set (n = 528 horses), the cohort with high genetic potential for a racecourse start had significantly fewer unraced horses (16% unraced) than did low (27% unraced) potential horses and had more favourable race outcomes among those that raced. Therefore, the information from SNPs included in the model may be used to predict horses with a greater chance of a racecourse start.
Application of Amide Bioisosteres in the Optimization of Lead Compounds
PROGRESS IN CHEMISTRY
Authors: Mei Yicheng; Yang Baowei
Abstract
Bioisosteres are a class of compounds or groups, these compounds with similar molecular shapes or volume, similar electronic distribution, and similar physical properties. Bioisosteres play a role in the same related biochemical system as agonist or antagonist, which possessed in related biological activities. The amide structure can be an important part of drugs and a constituent of a pharmacophore. However, the presence of this moiety can also be responsible for some significant drawbacks about drug molecular, including metabolic instability, toxicity, as well as limited passive diffusion across biological membranes. To avoid some of these shortcomings while retaining the desired attributes of the amide moiety, bioisosteric replacement of the amide moiety in lead compounds is an effective method. Through the amide bioisosteric replacements, other aims would be goal such as increasing the target potency and selectivity, developing new structures to expand or break through the patents and decreasing the difficulty of the synthesis of the compounds. This review focuses on the application of the replacement between amide and amide bioisosteres in the optimization of lead compounds in recent five years. We wish our review would offer a new thinking in the design and optimization of the compounds in the research and development of the new drugs.