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By contrast, all molecular data were included in the PCA to detect a difference between control and hypoxic populations of eusocial Heterocephalus glaber, indicating they may require many lower-fold changes in signaling pathways to adapt to low oxygen settings. Finally, none of the Cryptomys hottentotus subspecies showed a statistical difference between control and hypoxic groups, presumably due to hypoxia-tolerance derived from environmental pressures associated with a subterranean and social lifestyle. © 2020. Published by The Company of Biologists Ltd.Knowledge of the diet of marine mammals is fundamental to understanding their role in marine ecosystems and response to environmental change. Recently, animal-borne video cameras have revealed the diet of marine mammals that make short foraging trips. However, novel approaches that allocate video time to target prey capture events is required to obtain diet information for species that make long foraging trips over great distances. We combined satellite telemetry and depth recorders with newly developed date-/time-, depth- and acceleration-triggered animal-borne video cameras to examine the diet of female northern elephant seals during their foraging migrations across the eastern North Pacific. We obtained 48.2 h of underwater video, from cameras mounted on the head (n=12) and jaw (n=3) of seals. Fish dominated the diet (78% of 697 prey items recorded) across all foraging locations (range 37-55°N, 122-152°W), diving depths (range 238-1167 m) and water temperatures (range 3.2-7.4°C), while squid comprised only 7% of the diet. Identified prey included fish such as myctophids, Merluccius sp. and Icosteus aenigmaticus, and squid such as Histioteuthis sp., Octopoteuthis sp. and Taningia danae Our results corroborate fatty acid analysis, which also found that fish are more important in the diet, and are in contrast to stomach content analyses that found cephalopods to be the most important component of the diet. https://www.selleckchem.com/ALK.html Our work shows that in situ video observation is a useful method for studying the at-sea diet of long-ranging marine predators. © 2020. Published by The Company of Biologists Ltd.Whether individual results of genetic research studies ought to be disclosed to study participants has been debated in recent decades. Previously, the prevailing expert view discouraged the return of individual research results to participants because of the potential lack of analytic validity, questionable clinical validity and medical actionability, and questions about whether it is the role of research to provide participants with their data. With additional knowledge of participant perspectives and shifting views about the benefits of research and respect for participants, current expert consensus is moving toward support of returning such results. Significant ethical controversies remain, and there are many practical questions left to address, including appropriate procedures for returning results and the potential burden to clinicians when patients seek guidance about the clinical implications of research results. In this review, we describe current views regarding the return of genetic research results, including controversies and practical challenges, and consider the application of these issues to research on apolipoprotein L1 (APOL1), a gene recently associated with health disparities in kidney disease. Although this case is unique, it illustrates the complexities involved in returning results and highlights remaining questions. Copyright © 2020 by the American Society of Nephrology.The Gram-negative pathogen Neisseria gonorrhoeae (Gc) colonizes lysozyme-rich mucosal surfaces. Lysozyme hydrolyzes peptidoglycan, leading to bacterial lysis. Gc expresses two proteins, SliC and NgACP, that bind and inhibit the enzymatic activity of lysozyme. SliC is a surface-exposed lipoprotein, while NgACP is found in the periplasm and also released extracellularly. Purified SliC and NgACP similarly inhibit lysozyme. However, whereas mutation of ngACP increases Gc susceptibility to lysozyme, the sliC mutant is only susceptible to lysozyme when ngACP is inactivated. In this work, we examined how lipidation contributes to SliC expression, cellular localization, and resistance of Gc to killing by lysozyme. To do so, we mutated the conserved cysteine residue (C18) in the N-terminal lipobox motif of SliC, the site for lipid anchor attachment, to alanine. SliC (C18A) localized to soluble rather than membrane fractions in Gc and was not displayed on the bacterial surface. Less SliC (C18A) was detected in Gc lysatipidation was required for surface exposure of SliC, yet was dispensable for protecting the gonococcus from killing by lysozyme. To our knowledge, this is the first time the role of lipid anchoring of a lysozyme inhibitor has been investigated. These results help us understand how different lysozyme inhibitors are localized in bacteria and how this impacts resistance to lysozyme. Copyright © 2020 American Society for Microbiology.For high frequency transfer of pCF10 between E. faecalis cells, induced expression of the pCF10 genes encoding conjugative machinery from the prgQ operon is required. This process is initiated by the C inducer peptide produced by potential recipient cells. The expression timing of prgB, an "early" gene just downstream of the inducible promoter, has been studied extensively in single cells. However, several previous studies suggest that only 1-10% of donors induced for early prgQ gene expression actually transfer plasmids to recipients, even at very high recipient population density. One possible explanation for this is that only a minority of pheromone-induced donors actually transcribe the entire prgQ operon. Such cells would not be able to functionally conjugate but might play another role in the group behavior of donors. Here, we sought to (1) simultaneously assess the presence of RNAs produced from the proximal (early Q L ) and distal (late QL ) portions of the prgQ operon in individual cells; (2) investifer the plasmid. We examined whether induced cells might not be able to functionally conjugate due to premature induced transcript termination. Single cell analysis showed that most induced cells do, in fact, express all of the genes required for conjugation, suggesting that premature transcription termination within the prgQ operon does not account for failure of induced donor cell gene transfer. Copyright © 2020 American Society for Microbiology.
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