CXXC1, CXXC2 (FBXL10), CXXC3 (MBD1), CXXC4 (IDAX), CXXC5, CXXC6, CXXC7 (MLL), CXXC8 (FBXL11), CXXC9 (DNMT1) and CXXC10 are CXXC family genes within the human genome. Recently, we identified and characterized CXXC5 and CXXC10 genes as the homologs of CXXC4, which is implicated in the WNT signaling pathway. Here, we identified human FBXL19 (CXXC11) gene by using bioinformatics. Complete coding sequence of FBXL19 cDNA was determined by assembling 10 exons within AC135048.2 genome sequence. NM_019085.1 cDNA was a 5'-truncated partial cDNA corresponding to nucleotide position 138-2025 of FBXL19 complete coding sequence. FBXL19-BCL7C locus at chromosome 16p11.2, FBXL10-RHOF-BCL7A locus at chromosome 12q24.31, and FBXL11-RHOD locus at chromosome 11q13.2 were paralogous regions within the human genome. FBXL19 gene was found to encode a 674-amino-acid FBXL19 protein. Human FBXL19 showed 97.5% total-amino-acid identity with mouse Fbxl19. FBXHA domain (codon 11-128 of FBXL19) and FBXHB domain (codon 404-674 of FBXL19) were identified as novel domains conserved among FBXL19, FBXL10 and FBXL11. CXXC domain was located within the FBXHA domain, and F-box domain was located within the FBXHB domain. FBXL19 consists of FBXHA and FBXHB domains, while FBXL10 and FBXL11 consist of Jumonji C (JmjC), FBXHA and FBXHB domains. This is the first report on human FBXL19 gene as well as FBXHA and FBXHB domains.

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