1
|
Sedin Å, Landin-Olsson M, Cloetens L. Nutrient intake and adherence to the Nordic nutrition recommendations in a Swedish cohort with abdominal obesity. Nutr Health 2024; 30:167-174. [PMID: 35656784 PMCID: PMC10924704 DOI: 10.1177/02601060221105751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
BACKGROUND The Nordic Nutrition Recommendations (NNR) are developed to promote public health and to prevent food-related diseases such as obesity and cardiovascular diseases. OBJECTIVE To investigate the nutrient intake and adherence to the NNR in a Swedish cohort with abdominal obesity. DESIGN Dietary intake data were collected using 3-day food diaries and anthropometry and clinical chemistry parameters were measured at baseline of a long-term intervention studying weight-loss management. RESULTS Eighty-seven subjects with abdominal obesity successfully completed a 3-day food diary. Twelve of these subjects were excluded for further analysis due to implausible low-energy reporting. The remaining 75 subjects (76% females) had mean age of 52.3 ± 10.1 years and a mean body mass index of 34.3 ± 3.1 kg/m2. Mean total fat intake (41.2 ± 7.0E%) was exceeded by 56% of the sample size compared to the maximum recommended intake (RI) of 40E%, whereas mean carbohydrate intake (40.4 ± 8.0E%) was lower than the RI (45-60E%). The intake of saturated fatty acids was high compared to the NNR with only 2 women and none of men reported intakes within the RI of <10 E%. Adherence to the RI for dietary fibre was very low (16.0% and 13.3% when expressed as g/d and g/MJ, respectively). Analyses of micronutrient intake showed lowest adherences for vitamin D and sodium. CONCLUSIONS The nutrient intake in our subjects compared to NNR was rather low with a high total fat intake, particularly too high intake of saturated fatty acids, high salt consumption, and very low dietary fibre and vitamin D intake. More effort is clearly needed to promote healthy dietary habits among subjects with obesity.
Collapse
Affiliation(s)
- Åsa Sedin
- Biomedical nutrition, Pure and Applied Biochemistry, Lund University, Lund, Sweden
| | - Mona Landin-Olsson
- Department of Clinical Sciences, Lund University, Lund, Sweden
- Department of Endocrinology, Skåne University Hospital, Lund, Sweden
| | - Lieselotte Cloetens
- Biomedical nutrition, Pure and Applied Biochemistry, Lund University, Lund, Sweden
| |
Collapse
|
2
|
de Roos B, Wood S, Bremner D, Bashir S, Betancor MB, Fraser WD, Duthie SJ, Horgan GW, Sneddon AA. The nutritional and cardiovascular health benefits of rapeseed oil-fed farmed salmon in humans are not decreased compared with those of traditionally farmed salmon: a randomized controlled trial. Eur J Nutr 2020; 60:2063-2075. [PMID: 33015732 PMCID: PMC8137615 DOI: 10.1007/s00394-020-02396-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/23/2020] [Indexed: 11/30/2022]
Abstract
PURPOSE Farmed fish are increasingly raised on feeds containing vegetable oils, which affects their composition and possibly health properties. We investigated the effects of consuming farmed salmon, raised on different feeding regimes, on nutrient status and health outcomes in healthy subjects. METHODS Salmon were grown on feeds containing mainly fish oil (FO) or rapeseed oil (RO), resulting in an eicosapentaenoic acid (EPA) + docosahexaenoic acid (DHA) content of fillets of 2.1 or 0.9 g/100 g, respectively. In a randomized parallel controlled trial, 51 healthy subjects were allocated to consume 2 portions/week of FO salmon (n = 17), RO salmon (n = 17) or no additional salmon (Control, n = 17) as part of their habitual diet, for 18 weeks. We collected blood at 0, 9 and 18 weeks to measure omega-3 index (O3I) in red blood cells, plasma markers of cardiovascular risk, serum 25(OH)-vitamin D3 (25(OH)D3) and plasma trace elements. RESULTS After 18 weeks, O3I was similarly increased in subjects consuming 2 portions/week of FO or RO salmon compared to control (both p < 0.05). Serum 25(OH)D3 was significantly higher, whereas plasma triacylglycerols were significantly lower in subjects consuming RO salmon compared to control (both p < 0.05). Heart rate was significantly lower in subjects consuming FO salmon after 9 weeks, compared to control (p < 0.01). Salmon consumption did not affect other markers. CONCLUSION Consuming two portions/week of salmon raised on rapeseed oil rather than fish oil increased the O3I and vitamin D status, and decreased plasma triacylglycerols. These outcomes endorse opportunities for developing more sustainable feeds within aquaculture food systems. CLINICAL TRIAL REGISTRY This trial was registered at clinicaltrials.gov as NCT01916434.
Collapse
Affiliation(s)
- Baukje de Roos
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK.
| | - Sharon Wood
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
| | - David Bremner
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
| | - Shabina Bashir
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
| | | | | | - Susan J Duthie
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK.,School of Pharmacy and Life Sciences, Robert Gordon University, Aberdeen, UK
| | | | - Alan A Sneddon
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
| |
Collapse
|
3
|
Zimorovat A, Mohammadi M, Ramezani-Jolfaie N, Salehi-Abargouei A. The healthy Nordic diet for blood glucose control: a systematic review and meta-analysis of randomized controlled clinical trials. Acta Diabetol 2020; 57:1-12. [PMID: 31172295 DOI: 10.1007/s00592-019-01369-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 05/14/2019] [Indexed: 12/14/2022]
Abstract
AIMS Investigations on the possible effect of the Nordic diet (ND) on the glycemic control and the risk of diabetes have led to inconsistent results. The present study tried to determine the effect of the ND on the markers of blood glucose control using a systematic review and meta-analysis of randomized controlled clinical trials (RCTs). METHODS Predefined keywords were used to search PubMed, ISI Web of Science, Scopus and Google Scholar up to April 2019. The random effects model was used to compute the overall estimates. RESULTS In total, six RCTs with 618 participants (6-26 weeks of follow-up period) were included in the present study. The meta-analysis revealed that the ND might not have a considerable effect on fasting blood glucose levels [weighted mean difference (WMD) = -0.05 mmol/l, 95% CI - 0.13, 0.01, P = 0.112]. In contrast, the analyses showed that the ND significantly reduces serum insulin concentrations (WMD = -1.12 mU/l, 95% CI - 1.84, - 0.39, P = 0.002) and the homeostasis model assessment for insulin resistance (HOMA-IR) (WMD = - 0.34, 95% CI - 0.53, - 0.14, P = 0.001) compared to control diets. The effect on serum insulin levels was sensitive to one of the included studies. This dietary pattern did not significantly affect 2-h post-prandial blood glucose and Matsuda index. CONCLUSIONS Adherence to the ND might improve serum insulin and HOMA-IR levels; however, this effect was not confirmed for other markers of blood glucose control. Future well-designed and long-term clinical trials are highly recommended.
Collapse
Affiliation(s)
- Alireza Zimorovat
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Mohammadi
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Nahid Ramezani-Jolfaie
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Amin Salehi-Abargouei
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
| |
Collapse
|
4
|
Vitamin D Status and Components of Metabolic Syndrome in Older Subjects from Northern Finland (Latitude 65°North). Nutrients 2019; 11:nu11061229. [PMID: 31151163 PMCID: PMC6628213 DOI: 10.3390/nu11061229] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/22/2019] [Accepted: 05/28/2019] [Indexed: 02/07/2023] Open
Abstract
INTRODUCTION Vitamin D deficiency has been linked to the increased risk of several chronic diseases, especially in people living in the Northern Latitudes. The aim of this study was to assess the vitamin D status in older subjects born in 1945 in Northern Finland (latitude 65°North), and to examine its associations to components of metabolic syndrome (MetS). METHODS In this cross-sectional study, we invited 904 subjects born in 1945 from the Oulu region (Oulu45 cohort), out of an original cohort of 1332 subjects. In the cohort, plasma 25 hydroxyvitamin D (25OHD) levels were determined by an enzyme immunoassay of 263 men and 373 women, with a mean age baseline of 69±0.5 years old. We assessed the participants' usage of vitamin D supplements, as well as their lifestyle factors, using a questionnaire. RESULTS Nearly 80% of the subjects had low vitamin D levels [either vitamin D deficient (<50 nmol/L) or insufficient (50 - 75 nmol/L)], and only 20% of the participants had sufficient vitamin D levels (>75 nmol/L) (based on the American Endocrine Society guidelines). The low vitamin D status was associated with a high prevalence of MetS; a significantly higher number of subjects with MetS (41%) had low vitamin D levels in comparison to the non-MetS subjects (38%) (p ≤ 0.05). The subjects under vitamin D supplementation had a significantly lower incidence of MetS (42.6% vs 57.4%) and its components in comparison to the non-supplemented subjects (p ≤ 0.05). CONCLUSIONS Low vitamin D levels are a risk factor for MetS amongst other lifestyle factors, such as dietary habits and physical inactivity, among older subjects in the Northern Latitudes (65°North). Optimal supplementation of vitamin D, along with rich dietary sources of vitamin D, are highly recommended for older subjects as a means to positively affect, e.g., hypertension, insulin resistance, and obesity, as components of the MetS.
Collapse
|
5
|
The healthy Nordic dietary pattern has no effect on inflammatory markers: A systematic review and meta-analysis of randomized controlled clinical trials. Nutrition 2019; 58:140-148. [DOI: 10.1016/j.nut.2018.06.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/18/2018] [Accepted: 06/11/2018] [Indexed: 01/05/2023]
|
6
|
The effect of healthy Nordic diet on cardio-metabolic markers: a systematic review and meta-analysis of randomized controlled clinical trials. Eur J Nutr 2018; 58:2159-2174. [DOI: 10.1007/s00394-018-1804-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/02/2018] [Indexed: 12/24/2022]
|
7
|
Irish AK, Erickson CM, Wahls TL, Snetselaar LG, Darling WG. Randomized control trial evaluation of a modified Paleolithic dietary intervention in the treatment of relapsing-remitting multiple sclerosis: a pilot study. Degener Neurol Neuromuscul Dis 2017; 7:1-18. [PMID: 30050374 PMCID: PMC6053098 DOI: 10.2147/dnnd.s116949] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND/OBJECTIVE A Paleolithic diet may improve fatigue and quality of life in progressive multiple sclerosis (MS) patients, but past research has evaluated the effects of this dietary intervention in combination with other treatments such as exercise. Thus, the purpose of this pilot study was to evaluate a modified Paleolithic dietary intervention (MPDI) in the treatment of fatigue and other symptoms in relapsing-remitting MS (RRMS). METHODS We measured the effects of a MPDI in 17 individuals with RRMS. Of 34 subjects randomly assigned to control (maintain usual diet) and intervention (MPDI) groups, nine subjects (one man) completed the control group and eight subjects (one man) completed the MPDI. RESULTS Significant improvements were seen in Fatigue Severity Scale score and also in Multiple Sclerosis Quality of Life-54 and time to complete (dominant hand) 9-Hole Peg Test from baseline in MPDI subjects compared to controls. Increased vitamin K serum levels were also observed in MPDI subjects postprotocol compared to controls. CONCLUSION A Paleolithic diet may be useful in the treatment and management of MS, by reducing perceived fatigue, increasing mental and physical quality of life, increasing exercise capacity, and improving hand and leg function. By increasing vitamin K serum levels, the MPDI may also reduce inflammation.
Collapse
Affiliation(s)
- Amanda K Irish
- Motor Control Laboratories, Department of Health and Human Physiology, College of Liberal Arts and Sciences, The University of Iowa,
| | - Constance M Erickson
- Motor Control Laboratories, Department of Health and Human Physiology, College of Liberal Arts and Sciences, The University of Iowa,
| | - Terry L Wahls
- Veterans Affairs Medical Center
- Department of Internal Medicine, Carver College of Medicine
| | - Linda G Snetselaar
- Department of Epidemiology, College of Public Health, The University of Iowa, Iowa City, IA, USA
| | - Warren G Darling
- Motor Control Laboratories, Department of Health and Human Physiology, College of Liberal Arts and Sciences, The University of Iowa,
| |
Collapse
|
8
|
Robberecht H, De Bruyne T, Hermans N. Effect of various diets on biomarkers of the metabolic syndrome. Int J Food Sci Nutr 2016; 68:627-641. [PMID: 28027691 DOI: 10.1080/09637486.2016.1269726] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The impact of the normal whole diet in different countries and of special types of diet on the biomarkers of the metabolic syndrome (MetS) is reviewed. Diet type, specification, risk of MetS and studied biomarkers, as far as could be traced, are included. Critical points in published studies are mentioned. Description of the traditional dietary patterns for the various countries is not always well-defined and numbers of persons in the studied population are sometimes quite limited, which hamper drawing definite conclusions. Since a Nordic diet, a dietary approach to stop hypertension (DASH), and especially a Mediterranean diet are quite promising, due to its health claims, the food pattern is studied more in detail and a large spectrum of vegetarian diets are included as well. Most of the time lipid profile and high sensitive C-reactive protein (hsCRP) are the studied biomarkers in response to diet intake.
Collapse
Affiliation(s)
- Harry Robberecht
- a Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Foods , NatuRA (Natural Products and Food-Research and Analysis), University of Antwerp , Antwerp , Belgium
| | - Tess De Bruyne
- a Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Foods , NatuRA (Natural Products and Food-Research and Analysis), University of Antwerp , Antwerp , Belgium
| | - Nina Hermans
- a Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Foods , NatuRA (Natural Products and Food-Research and Analysis), University of Antwerp , Antwerp , Belgium
| |
Collapse
|
9
|
Väyrynen JP, Mutt SJ, Herzig KH, Väyrynen SA, Kantola T, Karhu T, Karttunen TJ, Klintrup K, Mäkelä J, Mäkinen MJ, Tuomisto A. Decreased preoperative serum 25-Hydroxyvitamin D levels in colorectal cancer are associated with systemic inflammation and serrated morphology. Sci Rep 2016; 6:36519. [PMID: 27819306 PMCID: PMC5098144 DOI: 10.1038/srep36519] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/14/2016] [Indexed: 12/27/2022] Open
Abstract
Deficiency of vitamin D is associated with increased risk of several types of cancer including colorectal cancer (CRC). However, factors contributing to low levels of 25-hydroxyvitamin D [25(OH)D] in CRC are not clear. Therefore, in this study serum 25(OH)D levels in 117 CRC patients and 86 controls were analyzed and correlated with the clinicopathological data including morphological subtype (serrated or conventional), quantity of tumor infiltrating immune cells, levels of systemic inflammatory markers, and disease outcome. We found that the patients had lower serum 25(OH)D levels compared to the controls. Interestingly, among the patients mismatch repair deficiency, serrated morphology, and high body mass index associated with lowest serum 25(OH)D levels. In addition, patients operated in summer or autumn had higher serum 25(OH)D levels. Furthermore, serum 25(OH)D levels inversely correlated with several systemic inflammatory markers, e.g. serum C reactive protein, but did not associate with prognosis. Mechanism leading to vitamin D deficiency in these patients are not clear but could be related to the effects of systemic inflammation. Longitudinal studies are warranted to assess vitamin D deficiency as a potential risk factor for serrated colorectal polyps and adenocarcinoma.
Collapse
Affiliation(s)
- Juha P Väyrynen
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| | - Shivaprakash J Mutt
- Research Unit of Biomedicine and Biocenter Oulu, University of Oulu, POB 5000, 90014 Oulu, Finland
| | - Karl-Heinz Herzig
- Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland.,Research Unit of Biomedicine and Biocenter Oulu, University of Oulu, POB 5000, 90014 Oulu, Finland.,Department of Gastroenterology and Metabolism, Poznan University of Medical Sciences, 27/33 Szpitalna Str., 60-572, Poland
| | - Sara A Väyrynen
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| | - Tiina Kantola
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| | - Toni Karhu
- Research Unit of Biomedicine and Biocenter Oulu, University of Oulu, POB 5000, 90014 Oulu, Finland
| | - Tuomo J Karttunen
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| | - Kai Klintrup
- Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland.,Research Unit of Surgery, Anesthesia and Intensive Care, University of Oulu, POB 5000, 90014 Oulu, Finland
| | - Jyrki Mäkelä
- Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland.,Research Unit of Surgery, Anesthesia and Intensive Care, University of Oulu, POB 5000, 90014 Oulu, Finland
| | - Markus J Mäkinen
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| | - Anne Tuomisto
- Cancer and Translational Medicine Research Unit, University of Oulu, POB 5000, 90014 Oulu, Finland.,Oulu University Hospital and Medical Research Center Oulu, POB 21, 90029 Oulu, Finland
| |
Collapse
|
10
|
Long MD, Sucheston-Campbell LE, Campbell MJ. Vitamin D receptor and RXR in the post-genomic era. J Cell Physiol 2015; 230:758-66. [PMID: 25335912 DOI: 10.1002/jcp.24847] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 10/16/2014] [Indexed: 12/25/2022]
Abstract
Following the elucidation of the human genome and components of the epigenome, it is timely to revisit what is known of vitamin D receptor (VDR) function. Early transcriptomic studies using microarray approaches focused on the protein coding mRNA that were regulated by the VDR, usually following treatment with ligand. These studies quickly established the approximate size and surprising diversity of the VDR transcriptome, revealing it to be highly heterogenous and cell type and time dependent. Investigators also considered VDR regulation of non-protein coding RNA and again, cell and time dependency was observed. Attempts to integrate mRNA and miRNA regulation patterns are beginning to reveal patterns of co-regulation and interaction that allow for greater control of mRNA expression, and the capacity to govern more complex cellular events. Alternative splicing in the trasncriptome has emerged as a critical process in transcriptional control and there is evidence of the VDR interacting with components of the splicesome. ChIP-Seq approaches have proved to be pivotal to reveal the diversity of the VDR binding choices across cell types and following treatment, and have revealed that the majority of these are non-canonical in nature. The underlying causes driving the diversity of VDR binding choices remain enigmatic. Finally, genetic variation has emerged as important to impact the transcription factor affinity towards genomic binding sites, and recently the impact of this on VDR function has begun to be considered.
Collapse
Affiliation(s)
- Mark D Long
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, New York
| | | | | |
Collapse
|
11
|
Campbell MJ. Vitamin D and the RNA transcriptome: more than mRNA regulation. Front Physiol 2014; 5:181. [PMID: 24860511 PMCID: PMC4030167 DOI: 10.3389/fphys.2014.00181] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Accepted: 04/21/2014] [Indexed: 12/23/2022] Open
Abstract
The GRCh37.p13 primary assembly of the human genome contains 20805 protein coding mRNA, and 37147 non-protein coding genes and pseudogenes that as a result of RNA processing and editing generate 196501 gene transcripts. Given the size and diversity of the human transcriptome, it is timely to revisit what is known of VDR function in the regulation and targeting of transcription. Early transcriptomic studies using microarray approaches focused on the protein coding mRNA that were regulated by the VDR, usually following treatment with ligand. These studies quickly established the approximate size, and surprising diversity of the VDR transcriptome, revealing it to be highly heterogenous and cell type and time dependent. With the discovery of microRNA, investigators also considered VDR regulation of these non-protein coding RNA. Again, cell and time dependency has emerged. Attempts to integrate mRNA and miRNA regulation patterns are beginning to reveal patterns of co-regulation and interaction that allow for greater control of mRNA expression, and the capacity to govern more complex cellular events. As the awareness of the diversity of non-coding RNA increases, it is increasingly likely it will be revealed that VDR actions are mediated through these molecules also. Key knowledge gaps remain over the VDR transcriptome. The causes for the cell and type dependent transcriptional heterogenetiy remain enigmatic. ChIP-Seq approaches have confirmed that VDR binding choices differ very significantly by cell type, but as yet the underlying causes distilling VDR binding choices are unclear. Similarly, it is clear that many of the VDR binding sites are non-canonical in nature but again the mechanisms underlying these interactions are unclear. Finally, although alternative splicing is clearly a very significant process in cellular transcriptional control, the lack of RNA-Seq data centered on VDR function are currently limiting the global assessment of the VDR transcriptome. VDR focused research that complements publically available data (e.g., ENCODE Birney et al., 2007; Birney, 2012), TCGA (Strausberg et al., 2002), GTEx (Consortium, 2013) will enable these questions to be addressed through large-scale data integration efforts.
Collapse
Affiliation(s)
- Moray J Campbell
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute Buffalo, NY, USA
| |
Collapse
|