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An XY fetus will develop along a female pathway if the target cells fail to respond to androgen. This androgen insensitivity occurs when the receptors on the target cells are unable to accept the hormone due to an impairment in receptor shape.
In endocrinology, target cells can refer to the cells where hormones have their effect. Target cells are capable of responding to hormones because they display receptors to which the circulating hormone can bind. In this way, hormones only affect a limited number of cells even though they are transported in the bloodstream throughout the body.
Target cell activation is dependant on three factors:
Modulation of these factors can control target cell response. For example after receptor stimulation the target cell signalling often feeds back to the hormone secreting tissue down-regulating hormone expression. Additionally the target cell can up or down-regulate receptor expression making it more or less sensitive to the same hormone. Finally, hormone-receptor affinity can be altered by expression of associated inhibitory or co-activating factors. In some instances alterations of receptor structure due to a genetic mutation can lead to a reduction in hormone-receptor affinity as in the case of androgen insensitivity.