The ‘winged helix’ or ‘forkhead’ transcription factor gene family is defined by a common 100 amino acid DNA binding domain which is a variant of the helix-turn-helix motif. Here we describe the structure and expression of the mouse fkh-6 and MFH-1 genes. Both genes are expressed in embryonic mesoderm from the headfold stage onward. Transcripts for both genes are localised mainly to mesenchymal tissues, fkh-6 mRNA is enriched in the mesenchyme of the gut, lung, tongue and head, whereas MFH-1 is expressed in somitic mesoderm, in the endocardium and blood vessels as well as the condensing mesenchyme of the bones and kidney and in head mesenchyme. Both genes are located within a 10 kb region (in mouse chromosome 8 at 5.26 +/− 2.56 cM telomeric to Actsk1. The close physical linkage of these two winged helix genes is conserved in man, where the two genes map to chromosome 16q22-24. This tandem arrangement suggests the common use of regulatory mechanisms. The fkh-6/MFH-1 locus maps close to the mouse mutation amputated, which is characterised by abnormal development of somitic and facial mesoderm. Based on the expression patterns we suggest that a mutation in MFH-1, not fkh-6 is the possible cause for the amputated phenotype.
Clustered arrangement of winged helix genes fkh-6 and MFH-1: possible implications for mesoderm development
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K.H. Kaestner, S.C. Bleckmann, A.P. Monaghan, J. Schlondorff, A. Mincheva, P. Lichter, G. Schutz; Clustered arrangement of winged helix genes fkh-6 and MFH-1: possible implications for mesoderm development. Development 1 June 1996; 122 (6): 1751–1758. doi: https://doi.org/10.1242/dev.122.6.1751
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