Altered Expression of Raet1e, a Major Histocompatibility Complex Class 1–Like Molecule, Underlies the Atherosclerosis Modifier Locus Ath11 10bNovelty and.

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Altered Expression of Raet1e, a Major Histocompatibility Complex Class 1–Like Molecule, Underlies the Atherosclerosis Modifier Locus Ath11 10bNovelty and Significance by José M. Rodríguez, Susanne Wolfrum, Megan Robblee, Kwan Y. Chen, Zachary N. Gilbert, Jae-Hoon Choi, Daniel Teupser, and Jan L. Breslow Circulation Research Volume 113(9):1054-1064 October 12, 2013 Copyright © American Heart Association, Inc. All rights reserved.

Subcongenic J narrows the Ath11 10b region. Subcongenic J narrows the Ath11 10b region. A, Schematic illustration of the subcongenic strains I and J. The horizontal bar indicates the extent of the genomic interval for each subcongenic strain. The dotted lines at either side of the bar indicate the region in which the recombination occurred. Black boxes indicate genes contained in subcongenic J. Gray boxes denote genes contained in subcongenic I but not subcongenic J. Diagonally striped boxes indicate genes outside both subcongenics. White arrows indicate the transcriptional orientation of the genes, and coordinates are based on genome assembly GRCm38. B, Atherosclerotic lesion area of 16-week-old F1.Apoe−/− Chr10SubJ(B/F) (BF; black column) vs F1.Apoe−/− Chr10SubJ(F/F) (FF; white column) male and female mice. C, Atherosclerotic lesion area of 16-week-old F1.Ldlr−/− Chr10SubJ(B/F) (BF; black column) vs F1.Ldlr−/− Chr10SubJ(F/F) (FF; white column) male and female mice. The numbers of mice studied with each genotype are indicated at the bottom of their respective columns. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.

Aortic expression of Ath11 10b region genes. Aortic expression of Ath11 10b region genes. Aortic expression of subcongenic J genes (Myb, Hbs1L, Aldh8a1, Sgk1, and Raet1e) in 16-week-old F1.Apoe−/− Chr10SubJ(B/F) (BF; black column) vs F1.Apoe−/− Chr10SubJ(F/F) (FF; white column) male (A) and female (B) mice and in prelesional 6-week-old F1.Apoe−/− Chr10SubJ(B/F) (BF; black column) vs F1.Apoe−/− Chr10SubJ(F/F) (FF; white column) male (C) and female (D) mice. There were 14 mice per group, and the expression of each gene was normalized to the level in F1.Apoe−/− Chr10SubJ(B/F) (BF) mice. ND indicates not detected. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.

Raet1 protein expression in aorta. Raet1 protein expression in aorta. A, The ×40 and (B) ×100 sections of aortic root from 16-week-old F1.Apoe−/− Chr10SubJ(B/F) mice immunostained with antibody to Raet1. Brown–red areas indicate regions of Raet1 protein expression (see arrows). C, Fluorescence-activated cell sorting (FACS) analysis of Raet1 expression in aortic endothelial cells. Aortic cell suspensions from 16-week-old F1.Apoe−/− Chr10SubJ(B/F) (BF; left) and F1.Apoe−/− Chr10SubJ(F/F) (FF; right) mice were subjected to FACS analysis. Top, Separation of CD45-positive cells and CD45-negative cells. The latter were analyzed for the presence of CD31 and Raet1, and the results are shown at the bottom. The results shown are representative of ≥3 experiments. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.

Creation of BAC-Raet1e transgenic mice and assessment of atherosclerosis. Creation of BAC-Raet1e transgenic mice and assessment of atherosclerosis. A, Not I fragment of C57 BAC RP23-149B5 containing only the Raet1e gene microinjected into FVB oocytes to obtain Raet1e transgenic mice. The black arrow indicates the extent and orientation of the Raet1e gene, the gray box indicates a pseudogene, the black box indicates the neighboring H60b gene not contained in the BAC, and the white arrow indicates its orientation. The coordinates given are based on genome assembly GRCm38. B and C, Effect of BAC-Raet1e transgene–driven overexpression of Raet1e on atherosclerosis. Atherosclerotic lesion area of F1.Apoe−/− Chr10SubJ(B/F) (BF; black column), F1.Apoe−/− Chr10SubJ(B/F) TgRaet1e22 (BF TgR22; diagonally striped black column), F1.Apoe−/− Chr10SubJ(F/F) (FF; white column), and F1.Apoe−/− Chr10SubJ(F/F) TgRaet1e22 (FF TgR22; diagonally striped white column) male (B) and female (C) mice. The numbers of mice studied with each genotype are indicated at the bottom of their respective columns. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.

Identification of the Raet1e aortic promoter by rapid amplification of 5′ end of cDNA (5′RACE). Identification of the Raet1e aortic promoter by rapid amplification of 5′ end of cDNA (5′RACE). A, Promoter, 5′-untranslated region (UTR) and the beginning of the translated region of the Raet1e gene. The black bar indicates the distal end of subcongenic J delimited by the single nucleotide polymorphism rs108701952, the gray columns indicate 5′-UTR exons, the black columns indicate translated exons, the thick black arrows indicate potential transcription start sites (TSS) determined based on the expression sequence tag (EST) database, the thin black arrow indicates the translation initiation ATG codon, and the striped box indicates a pseudogene. The coordinates given are based on genome assembly GRCm38. B, Agarose gel electrophoresis of size markers (left lane) and products of the aortic Raet1e 5′RACE (right lane). The circled numbers indicate the 3 major DNA products, which were isolated and sequenced to determine the TSS. C, Sequence comparison of the 3 major aortic Raet1e 5′RACE products. The gray arrows indicate 5′-UTR exons, the black arrows indicate translated exons, and the white bar indicates an intron. Aortic Raet1e transcripts 1 and 2 begin at TSS1 but differ by the absence of exon 3 in the latter. Aortic Raet1e transcript 3 begins in the middle of the intron IV and is likely an experimental artifact. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.

Analysis of functional differences in the Raet1e promoter between C57 and FVB. Based on the results shown in Online Figure XIII, it seems that the major difference in the aortic expression of Raet1e is determined by sequence differences between C57 and FVB in the promoter D fragment. Analysis of functional differences in the Raet1e promoter between C57 and FVB. Based on the results shown in Online Figure XIII, it seems that the major difference in the aortic expression of Raet1e is determined by sequence differences between C57 and FVB in the promoter D fragment. A, Top, Locations of sequence differences between C57 and FVB in the promoter D fragment. Below are the different forms of promoter D analyzed. The black bars indicate C57 sequence, the white bars indicate FVB sequence, and the vertical lines indicate sequence variations introduced by site-directed mutagenesis. The horizontal bar graph indicates the ratio of luciferase/renilla activity for each promoter construct. The black bar indicates the activity of a construct with only C57 sequence, the white bar indicates the activity of a construct with only FVB sequence, and the gray bars designate the activity of modified forms of the Raet1e promoter D. The activity ratio of luciferase/renilla is given as mean±SEM. B, Chromatographic representation of the sequence difference between C57 and FVB in the region of the culprit single nucleotide polymorphism (SNP) rs50817078 (arrow). C, SNP rs50817078 (JMRv10073) localizes to the core of the aortic Raet1e TSS1 based on the sequence obtained for transcript number 1 in Figure 5. José M. Rodríguez et al. Circ Res. 2013;113:1054-1064 Copyright © American Heart Association, Inc. All rights reserved.