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The Interleukin 7 Receptor Is Differentially Expressed in the Blood of Patients with Crohn’S Disease

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The Interleukin 7 Receptor Is Differentially Expressed in the Blood of Patients with Crohn’S Disease 1 The interleukin 7 receptor is differentially expressed in the blood of patients with Crohn’s Disease. 2 Shahan Mamoor1 3 1Thomas Jefferson School of Law 4 San Diego, CA 92101 [email protected] 5 The inflammatory bowel diseases include Crohn’s Disease and Ulcerative Colitis (1). Crohn’s 6 Disease has been understood as a complex genetic disorder of multifactorial nature (2) but these factors remain incompletely understood. We mined multiple published and public 7 datasets (3, 4, 5) to determine in an unbiased and systematic fashion which genes were expressed most differently in the blood cells of patients with Crohn’s Disease as compared to 8 healthy controls. We found that the gene encoding the interleukin 7 receptor, IL7R, was among 9 the genes whose expression changed most significantly between patients with Crohn’s Disease as compared to healthy controls, in the whole blood, in monocyte-derived macrophages, and in 10 regulatory T-cells (Treg). While patients with Crohn’s Disease expressed significantly lower levels of IL-7R in the whole blood and in monocyte-derived macrophage than healthy controls, 11 patients with Crohn’s Disease expressed significantly higher levels of IL-7R in Treg. IL-7R expression has been studied in the intestinal tissues of patients with Crohn’s Disease but this is 12 the first study to document differential expression of the IL-7 receptor in the blood cells of patients with Crohn’s Disease. 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Keywords: Crohn’s Disease, IBD, CD, IL7R, IL-7, interleukin 7, genetics of CD 28 1 1 Almost 20 years after the identification of the IBD1 susceptibility locus as NOD2 (6), the 2 genes that conspire to produce the Crohn’s Disease phenotype have still not been defined. The 3 number of patients diagnosed with Crohn’s Disease in the developed world has rapidly 4 increased over the past several decades (7) and the cause of this increase remains unknown 5 but has been attributed to lifestyle differences including stress, diet, and increased hygiene (8) 6 leading to a shift from Th2 to Th1-mediated responses due to lack of helminth infection (9). 7 However, study of Ashkenazi Jewish populations and families with inborn errors of immunity 8 have demonstrated that Crohn’s Disease, more so than Ulcerative Colitis, is a disease caused 9 10 by genetic susceptibility (2). Complicating the understanding of CD susceptibility genetics is the 11 fact that in a single person, multiple genes can contribute to a complex genetic disorder, and 12 within an affected population, different genes can collaborate to cause the same complex 13 genetic disorder in different patients. 14 In this study, we used an unbiased and systems-level method to compare the blood cell 15 transcriptomes patients with Crohn’s Disease with that of healthy patients, in the whole blood, in 16 monocyte-derived macrophage, and in regulatory T-cells (Treg) using published and public 17 datasets (3, 4, 5). We found that the gene encoding the interleukin-7 receptor was among the 18 genes whose expression was most different in patients with Crohn’s Disease across the whole 19 transcriptome - in the whole blood, in monocyte-derived macrophages, and in Treg. These data 20 21 suggest that IL-7R biology, not just in the intestinal tissues, but in the hematopoietic system, 22 may be important to the pathogenesis of Crohn’s Disease. 23 24 Methods 25 We utilized GSE126124 (3), GSE60083 (4), and GSE23996 (5) for this study in 26 conjunction with GEO2R. GSE126124 was generated using Affymetrix Human Gene 1.0 ST 27 Array technology with n=39 CD patients and n=32 healthy controls. GSE60083 was generated 28 using Illumina HumanWG-6 v3.0 expression beadchip technology with n=58 CD patients and 2 1 n=42 healthy controls. GSE23996 was generated using the HCI Human TReg Chip with n=6 2 CD patients and n=11 healthy controls. 3 The Benjamin and Hochberg method of p-value adjustment was used for ranking of 4 differential expression but raw p-values were used for assessment of statistical significance of 5 global differential expression. Log-transformation of data was auto-detected, and the NCBI 6 generated category of platform annotation was used. 7 A statistical test was performed to evaluate the significance of difference between mRNA 8 expression levels of IL-7R in patients with Crohn’s Disease versus in healthy controls using a 9 10 two-tailed, unpaired t-test with Welch’s correction. Only p-values less than 0.05 were 11 considered statistically significant. 12 13 Results 14 We probed three separate datasets, public and published, to identify genes that are 15 transcriptionally perturbed in the blood of patients with Crohn’s Disease. We identified IL7R as 16 one of the most differentially expressed genes transcriptome-wide, across all three datasets. 17 18 The gene encoding the interleukin 7 receptor is differentially expressed in the blood cells of patients with Crohn’s Disease. 19 IL7R was among the genes whose expression changed most significantly when 20 21 comparing the whole blood transcriptomes of patients with Crohn’s Disease versus that of 22 healthy controls (Table 1). IL7R was ranked 22 out of 33297 total transcripts; this differential 23 expression was statistically significant (Table 1; p=6.63E-11). 24 When comparing the transcriptomes of monocyte-derived macrophages, from patients 25 with Crohn’s Disease versus that of healthy controls, IL7R was again identified as among the 26 genes whose expressed changed most significantly transcriptome-wide. IL7R was ranked 85 27 out of 10468 total transcripts, and this was also statistically significant (Table 1; p=0.0031219). 28 A third comparative transcription analysis, between the regulatory T-cells of patients with Crohn’s Disease versus that of healthy controls, revealed that IL7R was also among the genes 3 1 whose expressed changed most significantly in CD25+ CD4+ Treg. IL7R was ranked 85 out of 2 397 total transcripts, and this was also statistically significant (Table 1; p=4.3E-03). 3 Thus, in the whole blood, the monocyte-derived macrophages, and in the regulatory T- 4 cells of patients with Crohn’s Disease, the IL-7 receptor is among the genes whose expression 5 changes most significantly. In the whole blood and in macrophages, this was transcriptome- 6 wide. 7 8 IL-7R is expressed at lower levels in the whole blood and monocyte-derived macrophages of patients with Crohn’s Disease as compared to healthy controls. 9 10 We then compared the expression levels of IL-7R between patients with Crohn’s 11 Disease and healthy controls. Patients with Crohn’s Disease expressed significantly lower 12 levels of IL-7R in the whole blood (Figure 1A, p<0.0001) and in the monocyte-derived 13 macrophages than healthy controls did (Figure 1B, p=0.0053). 14 15 IL-7R is expressed at higher levels in the regulatory T-cells of patients with Crohn’s Disease as compared to healthy controls. 16 When comparing expression of IL-7R between patients with Crohn’s Disease and 17 healthy controls in regulatory T-cells, we found that IL-7R was expressed at higher, rather than 18 lower levels in Treg when compared to healthy controls. This was also statistically significant 19 (Figure 2; p=0.0444). 20 21 Discussion 22 23 We studied multiple published and public datasets (3, 4, 5) to describe the transcriptional 24 landscape of the blood cells of patients with Crohn's Disease in terms of the most significant 25 gene expression changes compared to blood from healthy patients. We found that the receptor 26 for IL-7 was among the genes whose expression was most different when comparing the whole 27 blood, the monocyte-derived macrophages, and the regulatory T-cells from patients with Crohn’s 28 Disease versus that of healthy controls. 4 1 IL-7 is required for both B- (10, 11) and T-cell (12, 13) development in mice but IL-7 is 2 not absolutely required for B-cell development in humans (14). Studies of mice deficient in the 3 IL-7 receptor demonstrated that IL-7 signaling is required for steps in lymphocyte maturation 4 early in development and before T-cell receptor rearrangement events (15). Mice deficient in the 5 IL-2 receptor maintain a population of immature CD4+ CD25+ Foxp3high, but double deficiency 6 in IL-2R� and the alpha chain of the IL-7R (IL-7R�) leads to complete deficiency in CD4+ CD25+ 7 8 Foxp3+ Treg (16). This demonstrates that IL-7 signaling downstream of the IL-7 receptor in 9 collaboration with IL-2 is important for the development of regulatory T-cells. Gamma delta T- 10 cells of the blood are also affected by absence of IL-7 as IL7 receptor deficient mice lack both 11 splenic and intestinal epithelial gamma delta T-cells (17). IL-7 is produced in both the thymus 12 (18), likely by cortical epithelial cells (19) and in the bone marrow (20), as well as by multiple 13 other cell types including traditional (21) and follicular dendritic cells (22) , the intestinal 14 epithelium (23), fetal and adult liver (24, 25) as well as keratinocytes (26) (27). IL-7 controls the 15 16 size of the peripheral T-cell pool by providing proliferation cues to expand the size of the pool if 17 it is insufficient (28). If the size of the pool is too large, IL-7 becomes limiting, is then unable to 18 support survival and proliferation of all cells, and the size of the pool shrinks.
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