jueves, 31 de octubre de 2013

Leptin receptor deficiency - Genetics Home Reference

Leptin receptor deficiency - Genetics Home Reference

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Genetics Home Reference: your guide to understanding genetic conditions

Leptin receptor deficiency

Reviewed October 2013

What is leptin receptor deficiency?

Leptin receptor deficiency is a condition that causes severe obesity beginning in the first few months of life. Affected individuals are of normal weight at birth, but they are constantly hungry and quickly gain weight. The extreme hunger leads to chronic excessive eating (hyperphagia) and obesity. Beginning in early childhood, affected individuals develop abnormal eating behaviors such as fighting with other children over food, hoarding food, and eating in secret.
People with leptin receptor deficiency also have hypogonadotropic hypogonadism, which is a condition caused by reduced production of hormones that direct sexual development. Affected individuals experience delayed puberty or do not go through puberty, and may be unable to conceive children (infertile).

How common is leptin receptor deficiency?

The prevalence of leptin receptor deficiency is unknown. It has been estimated to account for up to 3 percent of individuals with severe obesity and hyperphagia that begins in early childhood.

What genes are related to leptin receptor deficiency?

Leptin receptor deficiency is caused by mutations in the LEPR gene. This gene provides instructions for making a protein called the leptin receptor, which is involved in the regulation of body weight. The leptin receptor protein is found on the surface of cells in many organs and tissues of the body including a part of the brain called the hypothalamus. The hypothalamus controls hunger and thirst as well as other functions such as sleep, moods, and body temperature. It also regulates the release of many hormones that have functions throughout the body.
The leptin receptor is turned on (activated) by a hormone called leptin that attaches (binds) to the receptor, fitting into it like a key into a lock. Normally, the body's fat cells release leptin in proportion to their size. As fat cells become larger, they produce more leptin. This rise in leptin indicates that fat stores are increasing. In the hypothalamus, the binding of leptin to its receptor triggers a series of chemical signals that affect hunger and help produce a feeling of fullness (satiety).
LEPR gene mutations that cause leptin receptor deficiency prevent the receptor from responding to leptin, leading to the excessive hunger and weight gain associated with this disorder. Because hypogonadotropic hypogonadism occurs in leptin receptor deficiency, researchers suggest that leptin receptor signaling is also involved in regulating the body's response to hormones that control sexual development, and that this response is affected by LEPR gene mutations. However, the mechanism of this effect is unknown.
Read more about the LEPR gene.

How do people inherit leptin receptor deficiency?

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Where can I find information about diagnosis or management of leptin receptor deficiency?

These resources address the diagnosis or management of leptin receptor deficiency and may include treatment providers.

You might also find information on the diagnosis or management of leptin receptor deficiency in Educational resources and Patient support.
General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.
To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.

Where can I find additional information about leptin receptor deficiency?

You may find the following resources about leptin receptor deficiency helpful. These materials are written for the general public.

You may also be interested in these resources, which are designed for healthcare professionals and researchers.

What other names do people use for leptin receptor deficiency?

  • congenital deficiency of the leptin receptor

  • leptin receptor-related monogenic obesity

  • obesity due to leptin receptor gene deficiency

  • obesity, morbid, due to leptin receptor deficiency

  • obesity, morbid, nonsyndromic 2

For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines and How are genetic conditions and genes named? in the Handbook.

What if I still have specific questions about leptin receptor deficiency?

Where can I find general information about genetic conditions?

What glossary definitions help with understanding leptin receptor deficiency?

autosomal ; autosomal recessive ; cell ; chronic ; congenital ; deficiency ; excessive eating ; fat cells ; gene ; hormone ; hyperphagia ; hypogonadism ; hypogonadotropic ; hypothalamus ; infertile ; monogenic ; prevalence ; protein ; puberty ; receptor ; recessive ; satiety
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.

References (6 links)

The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.

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