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. 2000 Jun;91(6):597–603. doi: 10.1111/j.1349-7006.2000.tb00987.x

Isolation and Characterization of Human NBL4, a Gene Involved in the β‐Catenin/Tcf Signaling Pathway

Hideyuki Ishiguro 1,2, Yoichi Furukawa 1, Yataro Daigo 1, Yasuo Miyoshi 3, Yutaka Nagasawa 3, Tadashi Nishiwaki 1, Teru Kawasoe 1, Manabu Fujita 1, Seiji Satoh 1, Nobutomo Miwa 1, Yoshitaka Fujii 2, Yusuke Nakamura 1,✉
PMCID: PMC5926395  PMID: 10874211

Abstract

β‐Catenin, a key regulator of cellular proliferation, is often mutated in various types of human cancer. To investigate cellular responses related to the β‐catenin signaling pathway, we applied a differential display method using mouse cells transfected with an activated form of mutant β‐catenin. This analysis and subsequent northern‐blot hybridization confirmed that expression of a murine gene encoding NBL4 (novel band 4.1‐like protein 4) was up‐regulated by activation of β‐catenin. To examine a possible role of NBL4 in cancer, we isolated the human homologue of the murine NBL4 gene by matching mNBL4 against the human EST (expressed sequence tag) database followed by 5’ rapid amplification of cDNA ends (5′RACE). The cDNA of hNBL4 encoded a protein of 598 amino acids that shared 87% identity in amino acid sequence with murine NBL4 and 71% with zebrafish NBL4. A 2.2‐kb hNBL4 transcript was expressed in all human tissues examined with high levels of expression in brain, liver, thymus and peripheral blood leukocytes and low levels of expression in heart, kidney, testis and colon. We determined its chromosomal localization at 5q22 by fluorescence in situ hybridization. Expression of hNBL4 was significantly reduced when β‐catenin was depleted in SW480 cells, a human cancer cell line that constitutionally accumulates β‐catenin. The results support the view that NBL4 is an important component of the β‐catenin/Tcf pathway and is probably related to determination of cell polarity or proliferation.

Keywords: β‐Catenin, Tcf/Lef complex, hNBL4, Band 4.1 superfamily, Chromosome 5q22

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