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Vol. 68, No. 3-4, 1995
Issue release date: 1995
Cytogenet Cell Genet 1995;68:185–191

Cloning and chromosomal localization of the human and murine genes for the T-cell transcription factors NFATc and NFATp

Li X. · Ho S.N. · Luna J. · Giacalone J. · Thomas D.J. · Timmerman L.A. · Crabtree G.R. · Francke U.
aHoward Hughes Medical Institute, Departments of bGenetics, cPediatrics, and dDevelopmental Biology and Pathology, Stanford University Medical Center, Stanford CA (USA)

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The nuclear factor of activated T cells (NFAT) is a transcription factor complex involved in the activation of cytokines and cell surface molecules associated with coordinating the actions of different cells required for an immune response. Two different genes have recently been cloned that encode proteins capable of functioning as the pre-existing (p) and cytosolic (c) component of the NFAT transcription complex, NFATc of human and NFATp of murine origin (Northrop et al., 1994; McCaffrey et al., 1993b). We report here the partial cDNA cloning of the murine homolog of NFATc and the human homolog of NFATp, and the chromosomal localization of both genes in both species to conserved syntenic regions. Through the use of mapping panels of human × Chinese hamster and mouse × rodent cells hybrids, the NFATc genes were mapped to human and mouse chromosomes 18. By analyzing a chromosome 18 radiation hybrid panel, the human NFATc gene was localized to the q terminus, closely linked to STS marker D18S497. The murine Nfatc gene was sublocalized to chromosome band 18E4 by FISH. The NFATp genes were mapped by somatic cell hybrid analysis to human chromosome 20 and mouse chromosome 2. Human NFATp was assigned to chromosome region 20ql3.2→ql3.3 by FISH. Based on the conserved syntenic region on human chromosome 20 and mouse chromosome 2, murine Nfatp is predicted to reside in the vicinity of a mutant locus wasted. Homozygous wst/wst mice display a phenotype reminiscent of severe combined immune deficiency or ataxia telangiectasia, disorders that could therefore be considered candidates for NFATp mutations.

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