True about androgen insensitivity syndrome are all, except: PGI 12, 13; JIPMER 13
**Core Concept**: Androgen Insensitivity Syndrome (AIS) is a rare genetic disorder affecting sex development, where individuals are genetically male but fail to develop typical male external genitalia due to a lack of response to androgens (male sex hormones). Androgens are produced in the testes and bind to androgen receptors (AR) in target tissues, leading to tissue response and development of male genitalia. In AIS, the AR is either absent or dysfunctional, resulting in insensitivity to androgens.
**Why the Correct Answer is Right**: PGI (Pulmonary Capillary, Glucose Transporter 1, and Insulin-like Growth Factor-1) are not involved in sex development, while JIPMER (Jawaharlal Institute Postgraduate Medical Education & Research Centre) is a medical school in India, unrelated to the topic of the question. The correct answer should focus on the physiological and molecular aspects of androgen action and insensitivity, rather than a specific institute or unrelated molecules.
**Why Each Wrong Option is Incorrect**:
A. PGI-12 and PGI-13 (Pulmonary Capillary, Glucose Transporter 1, and Insulin-like Growth Factor-1) are involved in glucose homeostasis, cellular respiration, and cell growth, respectively, and not in androgen action in genital development.
B. JIPMER-13 is a medical school in India, unrelated to the topic of the question.
C. Insulin-like Growth Factor-1 (IGF-1) is involved in growth and development, but it is not directly associated with androgen action in genital development.
D. Insulin Receptor (IR) is involved in insulin action on glucose homeostasis and cellular growth, but it is unrelated to androgen action in genital development.
**Clinical Pearl**: Androgen Insensitivity Syndrome is a genetic disorder presenting with ambiguous genitalia in affected individuals due to defective androgen action. Androgen action involves androgen binding to androgen receptors (AR) in target tissues, leading to transcription of target genes responsible for male genital development. In AIS, the androgen receptor is functional, but the affected individual is clinically male due to XY chromosomes and testicular production of androgens.
**Why the Correct Answer is Right**: The correct answer, DHT (Dihydrotestosterone), is a potent androgen that binds to androgen receptors (AR) and triggers downstream signaling pathways responsible for male genital development. In AIS, the AR is functional, but the individual is affected due to a lack of DHT production or impaired conversion of testosterone to DHT in the target tissues.
**Why Each Wrong Option is Incorrect**:
A. Testosterone is a precursor to DHT but cannot be directly converted to DHT in the target tissues, making it unsuitable for the question.
B. Insulin Receptor (IR) is involved in insulin action on glucose homeostasis and cellular growth, but not in androgen action in genital development.
C. Insulin-like Growth Factor-1 (IGF-1) is involved in growth and development