SON is an essential m6A target for hematopoietic stem cell fate

Stem cells regulate their self-renewal and differentiation fate outcomes through both symmetric and asymmetric divisions. m6A RNA methylation controls symmetric commitment and inflammation of hematopoietic stem cells (HSCs) through unknown mechanisms. Here, we demonstrate that the nuclear speckle protein SON is an essential m6A target required for murine HSC self-renewal, symmetric commitment, and inflammation control. Global profiling of m6A identified that m6A mRNA methylation of Son increases during HSC commitment. Upon m6A depletion, Son mRNA increases, but its protein is depleted. Reintroduction of SON rescues defects in HSC symmetric commitment divisions and engraftment. Conversely, Son deletion results in a loss of HSC fitness, while overexpression of SON improves mouse and human HSC engraftment potential by increasing quiescence. Mechanistically, we found that SON rescues MYC and suppresses the METTL3-HSC inflammatory gene expression program, including CCL5, through transcriptional regulation. Thus, our findings define a m6A-SON-CCL5 axis that controls inflammation and HSC fate.

RNA-binding proteins that lack canonical RNA-binding domains are rarely sequence-specific

Thousands of RNA-binding proteins (RBPs) crosslink to cellular mRNA. Among these are numerous unconventional RBPs (ucRBPs)-proteins that associate with RNA but lack known RNA-binding domains (RBDs). The vast majority of ucRBPs have uncharacterized RNA-binding specificities. We analyzed 492 human ucRBPs for intrinsic RNA-binding in vitro and identified 23 that bind specific RNA sequences. Most (17/23), including 8 ribosomal proteins, were previously associated with RNA-related function. We identified the RBDs responsible for sequence-specific RNA-binding for several of these 23 ucRBPs and surveyed whether corresponding domains from homologous proteins also display RNA sequence specificity. CCHC-zf domains from seven human proteins recognized specific RNA motifs, indicating that this is a major class of RBD. For Nudix, HABP4, TPR, RanBP2-zf, and L7Ae domains, however, only isolated members or closely related homologs yielded motifs, consistent with RNA-binding as a derived function. The lack of sequence specificity for most ucRBPs is striking, and we suggest that many may function analogously to chromatin factors, which often crosslink efficiently to cellular DNA, presumably via indirect recruitment. Finally, we show that ucRBPs tend to be highly abundant proteins and suggest their identification in RNA interactome capture studies could also result from weak nonspecific interactions with RNA.

The association between perceived social support, socio-economic status and mental health in young Malaysian adults

OBJECTIVES

To examine gender differences in mental health and perceived social support, relationship between parents' income and mental health, and differences in mental health across education levels.

METHODS

A total of 303 students aged 16 to 26 years were recruited from Selangor, Malaysia. The Multidimensional Scale of Perceived Social Support and General Health Questionnaire were used to measure the level of perceived social support and the mental health status. Demographic data, including education level and parents' income, were also obtained.

RESULTS

Females perceived significantly higher levels of overall social support than males (t = -2.7; p < 0.05). However, there were no significant differences in mental health status between males and females (t = -1.8; p > 0.05), as well as mental health status among different parental income groups (chi2 = 5.0; p > 0.05) and the education levels of the subjects (chi2 = 0.7; p > 0.05). A more favourable mental health status of the subjects was associated with higher parental incomes (r = -0.1; p < 0.05).

CONCLUSIONS

There were gender differences for perceived social support, but not for mental health status in older adolescents and young adults. There was also a relationship between parental income and an individual's mental health status, but mental health was not related to their education level.

A comparison of headache and non-headache sufferers on measures of social support and mental health problems

138 headaches sufferers and 138 subjects without headaches were studied to investigate if there were differences between headache and non-headache sufferers in terms of their mental health and social support levels. The overall results of this study indicated that headache sufferers, as compared with non-headache sufferers had slightly more mental health problems, and more social support from their family members. When the results were scrutinised in more detail, it was observed that headache sufferers reported that they felt less capable of making decisions about things, were not always able to face up to their problems, and sometimes thought about themselves as a worthless. Given that the study was based on a community, rather than clinic sample, further research would be required to examine the differing the types of headaches that people are suffering from, and the intensity of the headaches, in relation to mental health problems.

Patterns, incidence and predictive factors for pain after interventional radiology

AIM

To evaluate prospectively the pattern, severity and predictive factors of pain after interventional radiological procedures.

MATERIALS AND METHODS

All patients undergoing non-arterial radiological interventional procedures were assessed using a visual-analogue scale (VAS) for pain before and at regular intervals for 24 h after their procedure.

RESULTS

One hundred and fifty patients (87 men, mean age 62 years, range 18-92 years) were entered into the study. Significant increases in VAS score occurred 8 h after percutaneous biliary procedures (+47.7 mm, SD 14.9 mm; p=0.001), 6 h after central venous access and gastrostomy insertion (+23.7 mm, SD 19.5 mm; p=0.001 and +28.4 mm, SD 9.7 mm; p=0.007, respectively) and 4h after oesophageal stenting (+27.8 mm, SD 20.2 mm, p=0.001). Non-significant increases in VAS pain score were observed after duodenal and colonic stenting (duodenal: +5.13 mm, SD 7.47 mm; p=0.055, colonic: +23.3 mm, SD 13.10 mm, p=0.250) at a mean of 5h (range 4-6h). Patients reported a significant reduction in pain score for nephrostomy insertion (-28.4mm, SD 7.11 mm, p=0.001). Post-procedural analgesia was required in 99 patients (69.2%), 40 (28.0%) requiring opiates. Maximum post-procedural VAS pain score was significantly higher in patients who had no pre-procedural analgesia (p=0.003).

CONCLUSION

Post-procedural pain is common and the pattern and severity of pain between procedures is variable. Pain control after interventional procedures is often inadequate, and improvements in pain management are required.