Genome-wide scans for selection signatures in indigenous chickens reveal candidate genes associated with local adaptation.

Population growth and climate change pose challenges to the sustainability of poultry farming. The emphasis on high-yield traits in commercialized breeds has led to a decline in their adaptability. Chicken varieties adapted to the local environment, possessing traits that facilitate adaptation to climate change, such as disease resistance and tolerance to extreme weather conditions, can improve hybridization outcomes. In this study, we conducted an analysis of the population structure and genetic diversity of 110 chickens representing indigenous breeds from southern China and two different commercial breeds. Further, we performed comparative population genomics, utilizing nucleotide diversity and fixation statistics, to characterize genomic features of natural selection and to identify unique genetic traits and potential selection markers developed by indigenous breeds after adapting to the local environment. Results based on genetic diversity and population structure analyses showed that indigenous varieties exhibited high levels of genetic diversity. Commercial breeds that have been indigenously bred demonstrated higher levels of genetic diversity than those that have not, and breeds with different selection practices displayed significant differences in genetic structure. Additionally, we further searched for potential genomic regions in native chicken ecotypes, uncovering several candidate genes related to ecological adaptations affecting local breeds, such as IKBKB, S1PR1, TSHR, IL1RAPL1 and AMY2A, which are involved in disease resistance, heat tolerance, immune regulation and behavioral traits. This work provides important insights into the genomic characterization of ecotypes of native chicken in southern China. The identification of candidate genes associated with traits such as disease resistance, heat tolerance, immunomodulation, and behavioral traits is a significant outcome. These candidate genes may contribute to the understanding of the molecular basis of the adaptation of the southern native chicken to the local environment. It is recommended that these genes be integrated into chicken breeding programs to enhance sustainable agriculture and promote effective conservation and utilization strategies.

Genome-wide scans for selection signatures in indigenous pigs revealed candidate genes relating to heat tolerance.

Heat stress is a major problem that constrains pig productivity. Understanding and identifying adaptation to heat stress has been the focus of recent studies, and the identification of genome-wide selection signatures can provide insights into the mechanisms of environmental adaptation. Here, we generated whole-genome re-sequencing data from six Chinese indigenous pig populations to identify genomic regions with selection signatures related to heat tolerance using multiple methods: three methods for intra-population analyses (Integrated Haplotype Score, Runs of Homozygosity and Nucleotide diversity Analysis) and three methods for inter-population analyses (Fixation index (FST), Cross-population Composite Likelihood Ratio and Cross-population Extended Haplotype Homozygosity). In total, 1 966 796 single nucleotide polymorphisms were identified in this study. Genetic structure analyses and FST indicated differentiation among these breeds. Based on information on the location environment, the six breeds were divided into heat and cold groups. By combining two or more approaches for selection signatures, outlier signals in overlapping regions were identified as candidate selection regions. A total of 163 candidate genes were identified, of which, 29 were associated with heat stress injury and anti-inflammatory effects. These candidate genes were further associated with 78 Gene Ontology functional terms and 30 Kyoto Encyclopedia of Genes and Genomes pathways in enrichment analysis (P < 0.05). Some of these have clear relevance to heat resistance, such as the AMPK signalling pathway and the mTOR signalling pathway. The results improve our understanding of the selection mechanisms responsible for heat resistance in pigs and provide new insights of introgression in heat adaptation.

[Analysis of middle ear function of the patients with cleft palate after palatoplasty].

Objective: To investigate the middle ear function of the patients with cleft palate pre and post palatoplasty. Methods: 76 patients with cleft palate were investigated by clinical history and audiology examinations including electric otoscopy,tympanometry and click-ABR threshold. Results: The risk for middle ear function decreased with advancing age in the first 5 years. It was noticed that the otologic outcomes was related to the CP type. During long time follow-up, the frequency with the middle ear function disorder was always high within the CP patients but the proportion of the patients received tympanostomy tubes was low relatively. The prevalence of middle ear dysfunction did not differ with the time of cleft palate repair. Conclusion: The patients with cleft palate have middle ear function dysfunction in a long period of time,therefore a standard long-time follow-up system is necessary.

Pseudomonas Aeruginosa Infection Among Liver Transplant Recipients: A Clinical Analysis of 15 Cases.

BACKGROUND: The aim of this study was to describe the incidence, time of onset, clinical characteristics, and outcomes of Pseudomonas aeruginosa infection after liver transplantation (LT) and to investigate the drug resistance of P aeruginosa to frequently used antibiotics to provide evidence for clinical prevention and therapy. METHODS: Patients undergoing LT from January 1, 2003, through June 30, 2015, were considered. We determined the site of infection and the drug susceptibility of P aeruginosa isolates and collected these patients' data to confirm post-LT clinical and laboratory characteristics. RESULTS: Of the 303 patients who underwent cadaveric LT, 15 (5.0%) developed 20 episodes of P aeruginosa infection. All episodes of P aeruginosa infection were early-onset, with the bloodstream being the most common source of infection. The majority (86.7%) of these recipients were in intensive care unit stay, and 7 (46.7%) patients had a body temperature of ≥38°C at the onset of infection and an inappropriate antibiotic therapy. In 14 (93.3%) patients, P aeruginosa infection was nosocomial infection. Platelet numbers of <50 × 10(9)/L and lymphocyte count of <300/mm(3) developed in 33.3% and 46.7% of patients, respectively. Seven (46.7%) deaths were attributable to P aeruginosa infection. Of these 20 P aeruginosa isolates, 10 (50%) each were carbapenem-resistant and multidrug-resistant. P aeruginosa was relatively susceptible to amikacin, levofloxacin, or cefoperazone-sulbactam (resistance rate, 30%). CONCLUSIONS: The bloodstream was the most common site of infection; a high body temperature, nosocomial origin, decreased platelet and lymphocyte count occurring in the early period after LT, high antibiotic resistance rate, and high morbidity and mortality rates were the main characteristics of P aeruginosa infection.