Nackt (nkt), a new hair loss mutation of the mouse with associated CD4 deficiency

A spontaneous recessive mutation named nackt (symbol: nkt) affecting hair g rowth and T-cell development was discovered in a moderately inbred stock of mice. Skin lesions were characterized by sparse rough coat, bare patches a round the eyes and neck, and a scratching behavior throughout life. Fluores cence-activated cell sorter analysis indicated a deficiency in the CD4(+) 8 (-) T-cell subset in the thymus and a marked decrease in CD4(+) T cells in peripheral lymphoid organs. Linkage analysis using a set of molecular marke rs and an F-2 intersubspecific cross indicated that the mutation maps to th e central region of mouse chromosome 13, in a region homologous to human ch romosome 5q22-q35.