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    Topic review

    Familial Male-limited Precocious Puberty

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    Submitted by: Nicole Yin
    (This entry belongs to Entry Collection "MedlinePlus ")

    Definition

    Familial male-limited precocious puberty is a condition that causes early sexual development in males; females are not affected.

    1. Introduction

    Boys with this disorder begin exhibiting the signs of puberty in early childhood, between the ages of 2 and 5. Signs of male puberty include a deepening voice, acne, increased body hair, underarm odor, growth of the penis and testes, and spontaneous erections. Changes in behavior, such as increased aggression and early interest in sex, may also occur. Without treatment, affected boys grow quickly at first, but they stop growing earlier than usual. As a result, they tend to be shorter in adulthood compared with other members of their family.

    2. Frequency

    Familial male-limited precocious puberty is a rare disorder; its prevalence is unknown.

    3. Causes

    Familial male-limited precocious puberty can be caused by mutations in the LHCGR gene. This gene provides instructions for making a receptor protein called the luteinizing hormone/chorionic gonadotropin receptor. Receptor proteins have specific sites into which certain other proteins, called ligands, fit like keys into locks. Together, ligands and their receptors trigger signals that affect cell development and function.

    The protein produced from the LHCGR gene acts as a receptor for two ligands: luteinizing hormone and a similar hormone called chorionic gonadotropin. The receptor allows the body to respond appropriately to these hormones. In males, chorionic gonadotropin stimulates the development of cells in the testes called Leydig cells, and luteinizing hormone triggers these cells to produce androgens. Androgens, including testosterone, are the hormones that control male sexual development and reproduction. In females, luteinizing hormone triggers the release of egg cells from the ovaries (ovulation); chorionic gonadotropin is produced during pregnancy and helps maintain conditions necessary for the pregnancy to continue.

    Certain LHCGR gene mutations result in a receptor protein that is constantly turned on (constitutively activated), even when not attached (bound) to luteinizing hormone or chorionic gonadotropin. In males, the overactive receptor causes excess production of testosterone, which triggers male sexual development and lead to early puberty in affected individuals. The overactive receptor has no apparent effect on females.

    Approximately 18 percent of individuals with familial male-limited precocious puberty have no identified LHCGR gene mutation. In these individuals, the cause of the disorder is unknown.

    4. Inheritance

    This condition is inherited in an autosomal dominant, male-limited pattern, which means one copy of the altered LHCGR gene in each cell is sufficient to cause the disorder in males. Females with mutations associated with familial male-limited precocious puberty appear to be unaffected. In some cases, an affected male inherits the mutation from either his mother or his father. Other cases result from new mutations in the gene and occur in males with no history of the disorder in their family.

    5. Other Names for This Condition

    • familial gonadotrophin-independent sexual precocity
    • GIPP
    • gonadotrophin-independent precocious puberty
    • precocious pseudopuberty
    • pubertas praecox
    • testotoxicosis

    The entry is from https://medlineplus.gov/genetics/condition/familial-male-limited-precocious-puberty

    References

    1. Brito VN, Latronico AC, Arnhold IJ, Mendonça BB. Update on the etiology,diagnosis and therapeutic management of sexual precocity. Arq Bras EndocrinolMetabol. 2008 Feb;52(1):18-31. Review. Erratum in: Arq Bras Endocrinol Metabol.2008 Apr;52(3):576.
    2. Chan WY. Disorders of sexual development caused by luteinizing hormonereceptor mutations. Beijing Da Xue Xue Bao Yi Xue Ban. 2005 Feb 18;37(1):32-8.
    3. Soriano-Guillen L, Mitchell V, Carel JC, Barbet P, Roger M, Lahlou N.Activating mutations in the luteinizing hormone receptor gene: a human model ofnon-follicle-stimulating hormone-dependent inhibin production and germ cellmaturation. J Clin Endocrinol Metab. 2006 Aug;91(8):3041-7.
    4. Themmen AP, Verhoef-Post M. LH receptor defects. Semin Reprod Med. 2002Aug;20(3):199-204. Review.
    5. Traggiai C, Stanhope R. Disorders of pubertal development. Best Pract Res ClinObstet Gynaecol. 2003 Feb;17(1):41-56. Review.
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