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New X-linked syndrome of mental retardation, gynecomastia, and obesity is linked to DXS255.

We describe 14 males from 3 successive generations in a family who have X-linked mental retardation (XLMR), obesity, gynecomastia, speech difficulties, emotional lability, tapering fingers, and small feet. Linkage analysis using markers spread along the X chromosome demonstrated a gene localisation close to the centromere. Maximum lod scores for markers near the centromere, all at theta = 0.00, were 1.36 for DXS72, and 1.46 for DXYS1. The closest flanking markers which showed recombination were DXS84 and DXS94, defining the physical localisation within Xp21.1-q22. DXS255 was fully informative with lod-1 confidence interval for theta of 0.00-0.12. Clinical findings and linkage data in this family distinguish it from the Börjeson-Forssman-Lehmann syndrome and other previously described XLMR syndromes.