Control of Flowering and Cell Fate by LIF2, an RNA Binding Partner of the Polycomb Complex Component LHP1

Polycomb Repressive Complexes (PRC) modulate the epigenetic status of key cell fate and developmental regulators in eukaryotes. The chromo domain protein LIKE HETEROCHROMATIN PROTEIN1 (LHP1) is a subunit of a plant PRC1-like complex in Arabidopsis thaliana and recognizes histone H3 lysine 27 trimethylation, a silencing epigenetic mark deposited by the PRC2 complex. We have identified and studied an LHP1-Interacting Factor2 (LIF2). LIF2 protein has RNA recognition motifs and belongs to the large hnRNP protein family, which is involved in RNA processing. LIF2 interacts in vivo, in the cell nucleus, with the LHP1 chromo shadow domain. Expression of LIF2 was detected predominantly in vascular and meristematic tissues. Loss-of-function of LIF2 modifies flowering time, floral developmental homeostasis and gynoecium growth determination. lif2 ovaries have indeterminate growth and produce ectopic inflorescences with severely affected flowers showing proliferation of ectopic stigmatic papillae and ovules in short-day conditions. To look at how LIF2 acts relative to LHP1, we conducted transcriptome analyses in lif2 and lhp1 and identified a common set of deregulated genes, which showed significant enrichment in stress-response genes. By comparing expression of LHP1 targets in lif2, lhp1 and lif2 lhp1 mutants we showed that LIF2 can either antagonize or act with LHP1. Interestingly, repression of the FLC floral transcriptional regulator in lif2 mutant is accompanied by an increase in H3K27 trimethylation at the locus, without any change in LHP1 binding, suggesting that LHP1 is targeted independently from LIF2 and that LHP1 binding does not strictly correlate with gene expression. LIF2, involved in cell identity and cell fate decision, may modulate the activity of LHP1 at specific loci, during specific developmental windows or in response to environmental cues that control cell fate determination. These results highlight a novel link between plant RNA processing and Polycomb regulation

Direct esterification of a hydroxyl functional polyester resin with p-hydroxybenzoic acid - Part B: coating preparation and evaluation

Comparison of the physical properties of direct esterified, both purified and unpurified, and standard polyester coatings was undertaken. Clear and pigmented baked enamels, both non-cross-linked and cross-linked, were produced. Results indicate that coating binders containing the unpurified direct esterified resin are potentially superior to conventional binders as they exhibit the outstanding feature of being both hard and flexible. This improvement is due to the presence of unreacted p-hydroxybenzoic acid in the resin and is not due to a Liquid crystal phase. The improvement in physical properties is dependent upon the bake conditions used, with temperatures of 232 degreesC causing a marked decrease in coating performance. (C) 2000 Elsevier Science S.A. All rights reserved

Prevalence and correlates of cancer survivors' supportive care needs 6 months after diagnosis: a population-based cross-sectional study

Background: An understanding of the nature and magnitude of the impact of cancer is critical to planning how best to deliver supportive care to the growing population of cancer survivors whose need for care may span many years. This study aimed to describe the prevalence of and factors associated with moderate to high level unmet supportive care needs among adult cancer survivors six months after diagnosis. Methods: A population-based sample of adult cancer survivors diagnosed with one of the eight most incident cancers in Australia was recruited from two state-based cancer registries. Data for 1323 survivors were obtained by self-report questionnaire and linkage with cancer registry data. Unmet needs were assessed by the 34-item Supportive Care Needs Survey (SCNS-SF34). The data were examined using chi-square and multiple logistic regression analyses. Results: A total of 444 (37%) survivors reported at least one ‘moderate to high’ level unmet need and 496 (42%) reported ‘no need’ for help. Moderate to high level unmet needs were most commonly reported in the psychological (25%) and physical aspects of daily living (20%) domains. The five most frequently endorsed items of moderate to high unmet need were concerns about the worries of those close to them (15%), fears about the cancer spreading (14%), not being able to do the things they used to do (13%), uncertainty about the future (13%) and lack of energy/tiredness (12%). Survivors’ psychological characteristics were the strongest indicators of unmet need, particularly caseness for anxious preoccupation coping which was associated (OR=2.2-5.9) with unmet need for help across all domains. Conclusions: Unmet supportive care needs are prevalent among a subgroup of survivors transitioning from active treatment to survivorship, although lower than previously reported. In addition to coping support, valuable insight about how to prevent or address survivors’ unmet needs could be gained by examining the substantial proportion of survivors who report no unmet needs