Ethylated (U) specific primers, PC ?positive control, M.Sssi treated or untreated normal DNA, NC ?negative control (H20), T4, T6, T10, T35, T37: tumor samples, N4, N6, N10, N35, N37: normal samples. (B). Sequencing of MSP products; white squares – 0?9 methylation at the CpG dinucleotide, 
grey squares – 20?9 methylation at the CpG dinucleotide, dark grey squares – 60?9 methylation at the CpG dinucleotide, black squares – 80?00 methylation at the CpG dinucleotide, T2, T4, T5, T6, T9, T10, T11: tumor samples. (C). Methylation status of the fifty two CpG dinucleotides of the WNT7A 59-CpG island in tumor Itacitinib web samples with a methylated WNT7A gene, where each CpG dinucleotide is shown by either a black square when methylated or a grey square when unmethylated; arrows indicate position of MSP primers, T4, T5, T6 are tumor samples. (D). Restoration of WNT7A expression by 5-aza-29-deoxycytidine treatment of the A498 cell line, MSP-M – methylation analysis of the WNT7A gene by using methylated specific primers, NC ?negative control (H20). doi:10.1371/journal.pone.0047012.gLOH Analysis of Polymorphic Markers D3S2385, D3S2403 and D3S1252 in Clear Cell RCCA copy number study of the chromosome 3p25 region surrounding the WNT7A gene was performed using the microsatellite marker analysis. Detection of LOH was performed in 28 samples of clear cell RCCs and the adjacent non-malignant tissues for the polymorphic repeats D3S2403, D3S2385 and D3S1252. The frequency of loss for the above-mentioned markers was 93WNT7A Inactivated in Clear Cell RCCTable 2. Association of clinical-pathological characteristics and hypermethylation/LOH status of the WNT7A gene in clear cell RCCs.Parameters Age ,50 .50 Fuhrman nuclear grades 1? Fuhrman nuclear grades 3? Stages I I Stages III VMethylated 38 (5/13) 77 (24/31) 55 (16/29) 87 (13/15) 53 (17/32) 100 (12/12)p*-value 0.LOH 86 (6/7) 85 (17/20)A498 WNT7A-pcDNA3.1 and KRC/Y WNT7A-pcDNA3.1 colonies was 20.8 and 26.8 from the number of A498 Empty-pcDNA3.1 and KRC/Y Empty-pcDNA3.1 colonies respectively (Figure 4B). To further 60940-34-3 biological activity investigate the effect of WNT7A on cell proliferation and survival we performed the cell proliferation test for the A498 cell line. There was a significant negative effect of WNT7A expression on cell growth in comparison to cells transfected with an empty vector (p,0.05) (Figure 4C).0.94 (16/17) 70 (7/10)DiscussionA large number of tumor suppressor genes are inactivated through DNA hypermethylation of the promoter regions in a wide range of cancers [49?1]. Moreover studying of genetic and epigenetic alterations is a powerful tool in searching for novel tumor suppressor genes [52,53]. To perform a detailed analysis of rearrangements of the WNT7A gene in clear cell RCC, the methylation status of the 59-CpG island of the WNT7A gene and the presence of deletions in the locus that corresponds to the WNT7A gene were studied. MSP indeed revealed the hypermethylation (66 ) of the WNT7A gene promoter in clear cell RCC. In comparison, the WNT7A gene was hypermethylated in pancreatic carcinomas (71 ) [25] and OSCC (78 ) [26]. Additionally, it was shown that WNT7A is higher methylated in NSCLC tissue compared to matched normal lung tissues [19,23,24]. Thus promoter hypermethylation acts as the main mechanism of the WNT7A silencing in a wide range of cancer types. To investigate the genetic alterations of the WNT7A gene locus, the microsatellite markers analysis of this region on chromosome 3p25 was also performe.Ethylated (U) specific primers, PC ?positive control, M.Sssi treated or untreated normal DNA, NC ?negative control (H20), T4, T6, T10, T35, T37: tumor samples, N4, N6, N10, N35, N37: normal samples. (B). Sequencing of MSP products; white squares – 0?9 methylation at the CpG dinucleotide, grey squares – 20?9 methylation at the CpG dinucleotide, dark grey squares – 60?9 methylation at the CpG dinucleotide, black squares – 80?00 methylation at the CpG dinucleotide, T2, T4, T5, T6, T9, T10, T11: tumor samples. (C). Methylation status of the fifty two CpG dinucleotides of the WNT7A 59-CpG island in tumor samples with a methylated WNT7A gene, where each CpG dinucleotide is shown by either a black square when methylated or a grey square when unmethylated; arrows indicate position of MSP primers, T4, T5, T6 are tumor samples. (D). Restoration of WNT7A expression by 5-aza-29-deoxycytidine treatment of the A498 cell line, MSP-M – methylation analysis of the WNT7A gene by using methylated specific primers, NC ?negative control (H20). doi:10.1371/journal.pone.0047012.gLOH Analysis of Polymorphic Markers D3S2385, D3S2403 and D3S1252 in Clear Cell RCCA copy number study of the chromosome 3p25 region surrounding the WNT7A gene was performed using the microsatellite marker analysis. Detection of LOH was performed in 28 samples of clear cell RCCs and the adjacent non-malignant tissues for the polymorphic repeats D3S2403, D3S2385 and D3S1252. The frequency of loss for the above-mentioned markers was 93WNT7A Inactivated in Clear Cell RCCTable 2. Association of clinical-pathological characteristics and hypermethylation/LOH status of the WNT7A gene in clear cell RCCs.Parameters Age ,50 .50 Fuhrman nuclear grades 1? Fuhrman nuclear grades 3? Stages I I Stages III VMethylated 38 (5/13) 77 (24/31) 55 (16/29) 87 (13/15) 53 (17/32) 100 (12/12)p*-value 0.LOH 86 (6/7) 85 (17/20)A498 WNT7A-pcDNA3.1 and KRC/Y WNT7A-pcDNA3.1 colonies was 20.8 and 26.8 from the number of A498 Empty-pcDNA3.1 and KRC/Y Empty-pcDNA3.1 colonies respectively (Figure 4B). To further investigate the effect of WNT7A on cell proliferation and survival we performed the cell proliferation test for the A498 cell line. There was a significant negative effect of WNT7A expression on cell growth in comparison to cells transfected with an empty vector (p,0.05) (Figure 4C).0.94 (16/17) 70 (7/10)DiscussionA large number of tumor suppressor genes are inactivated through DNA hypermethylation of the promoter regions in a wide range of cancers [49?1]. Moreover studying of genetic and epigenetic alterations is a powerful tool in searching for novel tumor suppressor genes [52,53]. To perform a detailed analysis of rearrangements of the WNT7A gene in clear cell RCC, the methylation status of the 59-CpG island of the WNT7A gene and the presence of deletions in the locus that corresponds to the WNT7A gene were studied. MSP indeed revealed the hypermethylation (66 ) of the WNT7A gene promoter in clear cell RCC. In comparison, the WNT7A gene was hypermethylated in pancreatic carcinomas (71 ) [25] and OSCC (78 ) [26]. Additionally, it was shown that WNT7A is higher methylated in NSCLC tissue compared to matched normal lung tissues [19,23,24]. Thus promoter hypermethylation acts as the main mechanism of the WNT7A silencing in a wide range of cancer types. To investigate the genetic alterations of the WNT7A gene locus, the microsatellite markers analysis of this region on chromosome 3p25 was also performe.
