Genetic Screening to Identify Candidate Resistance Alleles to Cry1F Corn in Fall Armyworm Using Targeted Sequencing.

Evolution of practical resistance is the main threat to the sustainability of transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt crops). Monitoring of resistance to Cry and Vip3A proteins produced by Bt crops is critical to mitigate the development of resistance. Currently, Cry/Vip3A resistance allele monitoring is based on bioassays with larvae from inbreeding field-collected moths. As an alternative, DNA-based monitoring tools should increase sensitivity and reduce overall costs compared to bioassay-based screening methods. Here, we evaluated targeted sequencing as a method allowing detection of known and novel candidate resistance alleles to Cry proteins. As a model, we sequenced a Cry1F receptor gene (SfABCC2) in fall armyworm (Spodoptera frugiperda) moths from Puerto Rico, a location reporting continued practical field resistance to Cry1F-producing corn. Targeted sequencing detected a previously reported Cry1F resistance allele (SfABCC2mut), in addition to a resistance allele originally described in S. frugiperda populations from Brazil. Moreover, targeted sequencing detected mutations in SfABCC2 as novel candidate resistance alleles. These results support further development of targeted sequencing for monitoring resistance to Bt crops and provide unexpected evidence for common resistance alleles in S. frugiperda from Brazil and Puerto Rico.

Healthcare Delivery through Telemedicine during the COVID-19 Pandemic: Case Study from a Tertiary Care Center in South India.

The Coronavirus disease 2019 (COVID-19) pandemic has necessitated medical centers across the world to deliver healthcare through telemedicine. We discuss the adoption, delivery of telemedicine services at a tertiary care center and patient satisfaction involving 456 patients in south India. Most respondents had sought telemedicine care at the department of Medicine (16.23%). The maximum satisfaction was reported by patients in OBG (100%). The responses were generally positive across all the age groups. The paper offers insights on best practices adopted at the center, lessons learnt, and provides recommendations for health care systems offering telemedicine during COVID-19 times.

Identification of Aedes aegypti specificity motifs in the N-terminus of the Bacillus thuringiensis Cry2Aa pesticidal protein.

One advantage of using the Cry proteins of Bacillus thuringiensis as pesticides is their relatively narrow spectrum of activity, thus reducing the risk of non-target effects. Understanding the molecular basis of specificity has the potential to help us design improved products against emerging pests, or against pests that have developed resistance to other Cry proteins. Many previous studies have associated specificity with the binding of the Cry protein, particularly through the apical regions of domain II, to particular receptors on the midgut epithelial cells of the host insect. We have previously found that the specificity of Cry2A proteins against some insects is associated with domain I, which is traditionally associated with pore-formation but not receptor binding. In this work we identify four amino acids in the N-terminal region that, when mutated, can confer activity towards Aedes aegypti to Cry2Ab, a protein known to lack this toxicity. Intriguingly these amino acids are located in the region (amino acids 1-49) that is believed to be removed during proteolytic activation of the Cry protein. We discuss how the motifs containing these amino acids might be involved in the toxic process.

Study of hypothalamo pituitary adrenal axis in frail elderly subjects.

BACKGROUND: Frail elderly people are at increased risk of death and disability from minor environmental stresses such as infection because they do not have the reserves to respond and maintain adequate homeostasis Studies have shown that elderly patients had a significantly smaller response to ACTH stimulation test. Due to paucity of data regarding HPA axis functioning in frail elderly in Indian studies, we assessed the adrenocortical response to ACTH stimulation test in frail elderly subjects. OBJECTIVES: To assess the basal serum cortisol levels and serum cortisol response to 1 mcg ACTH stimulation test in frail elderly subjects. METHODOLOGY: Case control study. Elderly patients visiting OPD or admitted at M.S.Ramaiah hospital from September 2007 to August 2009 were classified into 2 groups. Those fulfilling the criteria of frailty above 65 yrs were taken as cases, non frail elderly were taken as controls. 40 cases and 20 controls were included. RESULTS: Equal number of hospitalized and out patient subjects were studied (20 in each group). Mean age was 75.35 years in hospitalized frails, 69.6 years in out patient frails, 68.3 years in controls. M: F ratio was 1:1. 45% of cases had frailty index of 4. A delta rise of > 9 mcg/dl (after 1 mcg ACTH stimulation test) was seen in 10 cases (25%) of frail elderly as compared to 16 controls(80%) indicating a possible adrenal insufficiency in remaining 30 cases (75%). The mean duration of hospital stay was 5.6 days. Frail elderly with poor ACTH response had poor quality of life as measured by activities of daily living score (p = .026). CONCLUSION: Frail elderly individuals have adrenal insufficiency (subclinical hypocortisolemia) compared to healthy elderly subjects, thereby indicating a poorer response to ACTH stimulation test may influence outcome during acute illness. Frail elderly with poor ACTH response had poor quality of life as measured by activities of daily living score (p = .026). Hyponatremia and hypotension co related well with state of adrenal insufficiency.