Genetic integrity of rice seeds during ageing and gene bank storage by SSR analysis
Poster Jun 30, 2014
I. O. Daniel, K. A. Adeboye, O. W. Adabale, E. S. Aladele and A. Boerner
Genetic alterations during ageing of rice seeds were analyzed using SSR markers. In the first experiment, seeds of 10 accessions of rice were subjected to artificial ageing in chambers conditioned to 55°C and 72±2%RH for 72 hours. In the second experiment, seeds of 4 accessions of rice stored in the NACGRAB gene bank, Nigeria in 2011 at 5± 4°C were compared with seeds of the same accessions freshly harvested in 2013. The objectives of this project were to evaluate ageing induced genetic changes and to establish physiological thresholds for loss of genetic integrity for rice seeds. Data were collected on seed germination and a seed vigour index was estimated. Genetic changes during the ageing course were evaluated by SSR markers using a Direct™ PCR kit. Genetic drifts and distances were estimated using PAST™ software and percentage genetic integrity was estimated from the genetic distance matrices. At 72 hours of ageing, seed germination percentage declined to 54.2% and vigour index 1.38 coinciding with the lowest estimate of genetic integrity (99.5%). Probability of genetic drift during ageing as revealed by primer RG178 was significant (P<0.005) for CG-14, IR-64 NERICA-1 and NERICA-L-34 and WITA-4. Differences in genetic distances were highest and estimate of genetic integrity was least in NERICA-1. Germination of seeds in gene bank after one and two years storage was above 99% and there were no significant genetic drifts for all accessions. The implications of result for gene bank activities will be discussed.
Characterization of a Type 2 diabetes-associated islet-specific enhancer cluster in STARD10 by genome editing of EndoC-βH1 cellsPoster
Genome-wide association studies (GWAS) have identified more than 100 genetic loci associated with type 2 diabetes. The majority of these are located in the intergenic or intragenic regions suggesting that the implicated variants may alter chromatin conformation. This, in turn, is likely to influence the expression of nearby or more remotely located genes to alter beta cell function. At present, however, detailed molecular and functional analyses are still lacking for most of these variants. We recently analysed one of these loci and mapped five causal variants in an islet-specific enhancer cluster within the STARD10 gene locus. Here, we aimed to understand how these causal variants influence b-cell function by alteration of the chromatin structure of enhancer clusterREAD MORE
Psychiatric Risk Gene Cacna1c and Early Life Stress: Potential Gene-Environment interactions?Poster
Early life stress (ELS) is highly associated with development of psychopathology
and mood disorders in adulthood. Genetic studies have identified variation in the gene calcium voltage-gated channel subunit alpha1C (CACNA1C) to increase risk for several psychiatric disorders. This poster assessed the expression of Cacna1c following prepubertal stress.
The Role of K13 in Artemisinin ResistancePoster
Plasmodium falciparum is evolving resistance to Artemisinin Combination Therapy. The gene with the strongest association with resistance is K13. K13 is an ortholog of the well characterized transcriptional regulator Keap1. In this work we transcriptionally characterized a mutant with a transposon inserted in the K13 promoter region which results in dysregulation of K13 at 2 points of the intraerythrocytic cycle of the life-cycle to identify the processes regulated by K13.READ MORE