This family consists of uncharacterized proteins around 110 residues in length and is mainly found in various mammalia species. LDOC1, a member of this family and a novel MZF-1-interacting protein, inhibits NF-kappaB activation and relates with cancer and some other diseases [1,2,3,4]. But the specific function of this family is still unknown.

1: Identification of a novel gene, LDOC1, down-regulated in cancer cell lines. Nagasaki K, Manabe T, Hanzawa H, Maass N, Tsukada T and Yamaguchi K; Cancer Lett. 140 (1-2), 227-234 (1999). PMID:10403563

2: Leucine-zipper protein, LDOC1, inhibits NF-kappaB activation and sensitizes pancreatic cancer cells to apoptosis. Nagasaki K, Schem C, von Kaisenberg C, Biallek M, Rosel F, Jonat W and Maass N; Int. J. Cancer 105 (4), 454-458 (2003). PMID:12712434

3: Over expression of LDOC1 and PARP1, two pro-apoptotic genes, in a patient with cryptorchidism and DiGeorge anomaly. Salemi M, Castiglione R, La Vignera S, Condorelli RA, Bosco P, Vicari E and Calogero AE; Hum. Cell 24 (2), 112-113 (2011). PMID:21547351

4: LDOC1 mRNA is differentially expressed in chronic lymphocytic leukemia and predicts overall survival in untreated patients. Duzkale H, Schweighofer CD, Coombes KR, Barron LL, Ferrajoli A, O'Brien S, Wierda WG, Pfeifer J, Majewski T, Czerniak BA, Jorgensen JL, Medeiros LJ, Freireich EJ, Keating MJ and Abruzzo LV; Blood 117 (15), 4076-4084 (2011). PMID:21310924