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Table 4. Selected relevant mRNA targets for novel miRNA candidatesa. miRNA candidate M-17 M-17 Target Gene Symbol HES3 EPHA10 Location Score 1p36.31 1p34.3 1359 1049 PRDM16 1p36.32 859 M-64 PR domain-containing protein 16: PR (positive regulatory domain I binding factor 1 and retinoblastoma-interacting zinc finger protein) domain hairy/enhancer of split, drosophila, homolog 2 HES2 1p36.31 674 M-64 wingless-type mmtv integration site family, member 3a WNT3A 1q42.13 584 M-64 Sry-Box 11 SOX11 2p25.2 539 M-64 plexin A1 PLXNA1 3q21.2 498 M-84 chromodomain helicase DNA-binding protein 5 CHD5 1p36.31 176 M-84 glutathione s-transferase, Mu-1 GSTM1 1p13.3 148 M-84 regulator of G protein signaling 2 RGS2 1q31.2 131 M-94 PR domain-containing protein 16 PRDM16 1p36.32 1644 M-94 chromodomain helicase DNA-binding protein 5 CHD5 1p36.31 1500 M-94 hairy/enhancer of split, drosophila, homolog of, 3 HES3 1p36.31 1467 M-94 runt-related transcription factor 3 RUNX3 1p36.11 1319 M-94 SRY-box 13 SOX13 1q32.1 1272 M-94 wingless-type mmtv integration site family, member 3A WNT3A 1q42.13 1239 NM-84 PR domain-containing protein 16 PRDM16 1p36.32 1277 NM-84 chromodomain helicase DNA-binding protein 5 CHD5 1p36.31 1015 NM-84 hairy/enhancer of split, drosophila, homolog of, 3 HES3 1p36.31 1003 NM-84 ephrin receptor EphB2 EPHB2 1p36.12 942 M-64 a Target Gene Name hairy/enhancer of split, drosophila, homolog 3 ephrin receptor (receptor tyrosine kinases; rtks) et al. (2002) showed thatidentified beta-catenin (116806) and TCF Predicted Batlle target mRNAs were through the (see miRanda algorithm TCF7L2; 602228) inversely control the expression of the EphB2/EphB3 (601839) receptors and their ligand, ephrin B1 (EFNB1; 300035), in colorectal cancer and along the crypt-villus axis. Disruption of EphB2 and EphB3 genes revealed that their gene products restrict cell intermingling and allocate cell populations within the intestinal epithelium. In EphB2/EphB3 null mice, the proliferative and differentiated populations intermingled. In adult EphB3 -/- mice, Paneth cells did not follow their downward migratory path, but scattered along crypt and villus. The authors concluded that, in the intestinal epithelium, beta-catenin and TCF couple proliferation and differentiation to the sorting of cell populations through the EphB/ephrin B system. Huusko et al. (2004) combined emetine inhibition of nonsensemediated decay (NMD) and microarray analysis with comparative genomic hybridization (CGH) to screen prostate cancer-derived cell lines for transcripts that undergo NMD and are transcribed from genes with deletions on both alleles. This way they could identify genes with inactivation of the 1 allele by a nonsense mutation and loss of the outer allele through deletion. They identified previously unknown mutations in the EPHB2 gene. The DU 145 prostate cancer cell line, originating from a brain metastasis, was found to carry a truncating mutation of EPHB2 (600997.0001) and a deletion of the remaining allele. Additional frameshift, splice site, missense, and nonsense mutations were present in clinical prostate cancer samples. Transfection of DU 145 cells, which lack functional EPHB2, with wildtype EPHB2 suppressed clonogenic growth. These studies indicated that EPHB2 may have an essential role in cell migration and maintenance of normal tissue architecture and that mutational inactivation of the EPHB2 gene may be important in the progression and metastasis of prostate cancer. Mercola and Welsh (2004) reviewed the combination of methods, emetine suppression of NMD and microarray analysis with CGH, for identifying disease-gene associations. As many as one-third of inherited disorders are caused by mutations that disrupt reading frames.