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Background  Several reports indicate a commonly deleted chromosomal region independent from, and distal to the  TP53  locus in a variety of human tumors. In a previous study, we reported a similar finding in a rat tumor model for endometrial carcinoma (EC) and through developing a deletion map, narrowed the candidate region to 700 kb, harboring 19 genes. In the present work real-time qPCR analysis, Western blot, semi-quantitative qPCR, sequencing, promoter methylation analysis, and epigenetic gene expression restoration analyses (5-aza-2´-deoxycytidine and/or trichostatin A treatments) were used to analyze the 19 genes located within the candidate region in a panel of experimental tumors compared to control samples.    Results  Real-time qPCR analysis suggested  Hic1  (hypermethylated in cancer 1),  Inpp5k  (inositol polyphosphate-5-phosphatase K; a.k.a.  Skip , skeletal muscle and kidney enriched inositol phosphatase) and  Myo1c  (myosin 1c) as the best targets for the observed deletions. No mutation in coding sequences of these genes was detected, hence the observed low expression levels suggest a haploinsufficient mode of function for these potential tumor suppressor genes. Both  Inpp5k  and  Myo1c  were down regulated at mRNA and/or protein levels, which could be rescued in gene expression restoration assays. This could not be shown for  Hic1 .    Conclusion   Innp5k  and  Myo1c  were identified as the best targets for the deletions in the region.  INPP5K  and  MYO1C  are located adjacent to each other within the reported independent region of tumor suppressor activity located at chromosome arm 17p distal to  TP53  in human tumors. There is no earlier report on the potential tumor suppressor activity of INPP5K and MYO1C, however, overlapping roles in phosphoinositide (PI) 3-kinase/Akt signaling, known to be vital for the cell growth and survival, are reported for both. Moreover, there are reports on tumor suppressor activity of other members of the gene families that  INPP5K  and  MYO1C  belong to. Functional significance of these two candidate tumor suppressor genes in cancerogenesis pathways remains to be investigated.    Electronic supplementary material  The online version of this article (doi:10.1186/s12863-015-0238-4) contains supplementary material, which is available to authorized users.

bmc genomic data

Analysis of an independent tumor suppressor locus telomeric to Tp53 suggested Inpp5k and Myo1c as novel tumor suppressor gene candidates in this region