Ageing may be due to mutation accumulation across the lifespan, leading to tissue dysfunction, disease, and death. We tested whether germline autosomal mutation rates in young adults predict their ...remaining survival, and, for women, their reproductive lifespans. Age-adjusted mutation rates (AAMRs) in 61 women and 61 men from the Utah CEPH (Centre d'Etude du Polymorphisme Humain) families were determined. Age at death, cause of death, all-site cancer incidence, and reproductive histories were provided by the Utah Population Database, Utah Cancer Registry, and Utah Genetic Reference Project. Higher AAMRs were significantly associated with higher all-cause mortality in both sexes combined. Subjects in the top quartile of AAMRs experienced more than twice the mortality of bottom quartile subjects (hazard ratio HR, 2.07; 95% confidence interval CI, 1.21-3.56; p = 0.008; median survival difference = 4.7 years). Fertility analyses were restricted to women whose age at last birth (ALB) was ≥ 30 years, the age when fertility begins to decline. Women with higher AAMRs had significantly fewer live births and a younger ALB. Adult germline mutation accumulation rates are established in adolescence, and later menarche in women is associated with delayed mutation accumulation. We conclude that germline mutation rates in healthy young adults may provide a measure of both reproductive and systemic ageing. Puberty may induce the establishment of adult mutation accumulation rates, just when DNA repair systems begin their lifelong decline.
Buffalograss Buchloë dactyloides (Nutt.) Engel. syn. Bouteloua dactyloides (Nutt.) Columbus is a United States native turfgrass species that requires less irrigation, fungicides and pesticides ...compared to more commonly used turfgrass species. In areas where water is limited, interest in this grass species for lawns is increasing. While several buffalograss cultivars have been developed through buffalograss breeding, the timeframe for new cultivar development is long and is limited by a lack of useful genetic resources. Two high throughput next-generation sequencing techniques were used to increase the genomic resources available for buffalograss.
Total RNA was extracted and purified from leaf samples of two buffalograss cultivars. '378' and 'Prestige' cDNA libraries were subjected to high throughput sequencing on the Illumina GA and Roche 454 Titanium FLX sequencing platforms. The 454 platform (3 samples) produced 1,300,885 reads and the Illumina platform (12 samples) generated approximately 332 million reads. The multiple k-mer technique for de novo assembly using Velvet and Oases was applied. A total of 121,288 contigs were assembled that were similar to previously reported Ensembl commelinid sequences. Original Illumina reads were also mapped to the high quality assembly to estimate expression levels of buffalograss transcripts. There were a total of 325 differentially expressed genes between the two buffalograss cultivars. A glycosyl transferase, serine threonine kinase, and nb-arc domain containing transcripts were among those differentially expressed between the two cultivars. These genes have been previously implicated in defense response pathways and may in part explain some of the performance differences between 'Prestige' and '378'.
To date, this is the first high throughput sequencing experiment conducted on buffalograss. In total, 121,288 high quality transcripts were assembled, significantly expanding the limited genetic resources available for buffalograss genetic studies. Additionally, 325 differentially expressed sequences were identified which may contribute to performance or morphological differences between 'Prestige' and '378' buffalograss cultivars.
Home care services are increasing across Canada and in other developed nations. There has been increased pressure on home care programs to not only accept more clients more rapidly but also work more ...efficiently. Case management is an approach through which clients access and receive home care. With both rising numbers of clients and growing complexity among them, case managers' work and workload are also increasing. The demands on case managers and expansion in caseloads are happening without an increase in resources or funding. With case manager work increasing steadily, an understanding of the factors that influence their work and workload is vital.
The purpose of this study was to explore what factors influence case managers' work and workload.
This study used an ethnographic approach. It took place in Alberta, Canada, in 3 home care offices in urban and suburban geographic areas. Purposive sampling was used, and participants included 28 home care case managers with predominantly long-term clients (>3 months on home care), 3 site managers, and 1 project lead. Data collection methods included semistructured interviews, nonparticipant observation, participant journaling, and focus groups.
Case manager works were portrayed in 2 key ways: the number and type of tasks a case manager was required to complete and the amount of time and energy needed to complete a task. The factors that influence case manager work and workload fall into 3 overarching categories: structural, operational, or individual factors.
The 3 overarching categories, as well as interactions between various factors, contribute to what is known about case managers' work and workload. Participants found it difficult to discuss the factors in isolation because the interaction and "messiness" of the factors were inherent in their actions and stories about their work and workload. Workload includes not only the easily captured work such as direct care and specific activities such as assessment but also diverse forms of invisible work such as problem solving, rapport building, and caseload management, as well as emotional work such as coping, stress management, and team support.
Case managers' work and workload in home care are important phenomena. In a climate of budgetary restraint and an aging population, which seemingly prefer home care as much as the system desires to provide it as a main option for care, it is important to capture, recognize, and legitimize an understanding of case managers' work and workload. Increased knowledge in this area could, in turn, transforms both home care and case management.
Chinch bugs are common pests of many agronomic and horticulturally important crops and turfgrasses. Previous research has indicated that some grasses exhibit resistance to multiple chinch bug ...species, whereas others are resistant to only one species. The objectives of this research were to document differences in the probing frequencies and locations among Blissus species as well as differences in mouthpart morphology as a first step in understanding the differential responses of grasses to chinch bug feeding. Scanning electron microscopy detected differences in the total lengths of proboscises as well as individual mouthpart segments among the four species studied. Blissus occiduus Barber probed significantly more often on buffalograss, Buchloë dactyloides (Nuttall) Engelmann, than any other plant material. Probing locations of B. occiduus and Blissus leucopterus leucopterus (Say) were similar on both B. occiduus-resistant and susceptible buffalograsses and KS94 sorghum, Sorghum bicolor (L.) Moench (B. occiduus-resistant, B. l. leucopterus-resistant). However, on ‘Wheatland’ sorghum (B. occiduus-resistant, B. l. leucopterus-susceptible), stylet tracts of B. l. leucopterus most often terminated in the bundle sheath cells, whereas those of B. occiduus generally terminated in the vascular tissues.
Oxidative enzymes are one of many key players in plant tolerance responses and defense signaling pathways. This study evaluated gene expression of four buffalograss transcripts (two peroxidases, a ...catalase, and a GRAS (gibberellic acid insensitive GAI, repressor of GAI, and scarecrow) and total peroxidase activity in response to western chinch bug (Blissus occiduus Barber) feeding in susceptible and resistant buffalograsses (Buchloë dactyloides (Nuttall) Engelmann). Basal levels of all four transcripts were consistently higher in the resistant buffalograss when compared with the susceptible genotype, which suggests important physiological differences exist between the two buffalograsses. The four defense-related transcripts also showed differential expression between infested and control plants for both the resistant and susceptible buffalograsses. Differences in total peroxidase activity were also detected between control and infested plants, and basal peroxidase activity was higher in the resistant genotype. Overall, this study indicates that elevated basal levels of specific peroxidases, catalases, and GRAS may be an effective buffalograss defense strategy against chinch bug feeding and other similar biotic stresses.
The western chinch bug, Blissus occiduus Barber, is a serious pest of buffalograss, Buchloe dactyloides (Nuttall) due to physical and chemical damage caused during the feeding process. Although ...previous work has investigated the feeding behaviors of chinch bugs in the Blissus complex, no study to date has explored salivary gland morphology and the associated salivary complex of this insect. Whole and sectioned B. occiduus salivary glands were visualized using light and scanning electron microscopy to determine overall structure and cell types of the salivary glands and their individual lobes. Microscopy revealed a pair of trilobed principal glands and a pair of tubular accessory glands of differing cellular types. To link structure with function, the salivary gland proteome was characterized using liquid chromatography tandem mass spectrometry. The salivary proteome analysis resulted in B. occiduus sequences matching 228 nonhomologous protein sequences of the pea aphid, Acyrthosiphon pisum (Harris), with many specific to the proteins present in the salivary proteome of A. pisum. A number of sequences were assigned the molecular function of hydrolase and oxido-reductase activity, with one specific protein sequence revealing a peroxidase-like function. This is the first study to characterize the salivary proteome of B. occiduus and the first of any species in the family Blissidae.
Abstract
The management of multiple chronic conditions (MCC) in older adults living in the community is complex. Little is known about the experiences of interdisciplinary primary care and home ...providers who care for this vulnerable group. The aim of this study was to explore the experiences of healthcare providers in managing the care of community-living older adults with MCC and to highlight their recommendations for improving care delivery for this group. A qualitative interpretive description design was used. A total of 42 healthcare providers from two provinces in Canada participated in semi-structured interviews. Participants represented diverse disciplines (e.g., physicians, nurses, social workers, personal support workers) and settings (e.g., primary care and home care). Thematic analysis was used to analyze interview data. The experiences of healthcare providers managing care for older adults with MCC were organized into six major themes: (1) managing complexity associated with MCC, (2) implementing person-centred care, (3), involving and supporting family caregivers, (4) using a team approach for holistic care delivery, (5) encountering rewards and challenges in caring for older adults with MCC, and (6) recommending ways to address the challenges of the healthcare system. Healthcare providers highlighted the need for a more comprehensive integrated system of care to improve care management for older adults with MCC and their family caregivers. Specifically, they suggested increased care coordination, more comprehensive primary care visits with an interprofessional team, and increased home care support.
Stargardt disease (STGD, also known as fundus flavimaculatus; FFM) is an autosomal recessive retinal disorder characterized by a juvenile-onset macular dystrophy, alterations of the peripheral ...retina, and subretinal deposition of lipofuscin-like material. A gene encoding an ATP-binding cassette (ABC) transporter was mapped to the 2-cM (centiMorgan) interval at 1p13-p21 previously shown by linkage analysis to harbour the STGD gene. This gene, ABCR, is expressed exclusively and at high levels in the retina, in rod but not cone photoreceptors, as detected by in situ hybridization. Mutational analysis of ABCR in STGD families revealed a total of 19 different mutations including homozygous mutations in two families with consanguineous parentage. These data indicate that ABCR is the causal gene of STGD/FFM.
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