Summary

MedlinePlus is an online health information resource. It is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). To promote the transmission of knowledge, this entry collection contains information about the effects of genetic variation on human health transferred from MedlinePlus.

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XMEN
X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection, and neoplasia (typically known by the acronym XMEN) is a disorder that affects the immune system in males. 
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Topic Review
Alymphoid Cystic Thymic Dysgenesis
T-cell immunodeficiency, congenital alopecia, and nail dystrophy is a type of severe combined immunodeficiency (SCID), which is a group of disorders characterized by an almost total lack of immune protection from foreign invaders such as bacteria and viruses. People with this form of SCID are missing functional immune cells called T cells, which normally recognize and attack foreign invaders to prevent infection. Without functional T cells, affected individuals develop repeated and persistent infections starting early in life. The infections result in slow growth and can be life-threatening; without effective treatment, most affected individuals live only into infancy or early childhood.
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Topic Review
SHORT Syndrome
Short stature, hyperextensibility, hernia, ocular depression, Rieger anomaly, and teething delay, commonly known by the acronym SHORT syndrome, is a rare disorder that affects many parts of the body.
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  • 04 Jan 2021
Topic Review
RAMSVPS
Retinal arterial macroaneurysm with supravalvular pulmonic stenosis (RAMSVPS) is a disorder that affects blood vessels in the eyes and heart. The condition generally becomes apparent in infancy or childhood.
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Topic Review
RRM2B-MDS
RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy (RRM2B-MDS) is a severe condition that begins in infancy and affects multiple body systems. It is associated with brain dysfunction combined with muscle weakness (encephalomyopathy). Many affected individuals also have a kidney dysfunction known as renal tubulopathy.
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  • 04 Jan 2021
Topic Review
LTBL
Leukoencephalopathy with thalamus and brainstem involvement and high lactate (LTBL) is a disorder that affects the brain. LTBL is one of a group of genetic disorders called leukodystrophies, which feature abnormalities of the nervous system's white matter. White matter consists of nerve fibers covered by a fatty substance, called myelin, that insulates nerve fibers and promotes the rapid transmission of nerve impulses.
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  • 04 Jan 2021
Topic Review
LBSL
Leukoencephalopathy with brainstem and spinal cord involvement and lactate elevation (commonly referred to as LBSL) is a progressive disorder that affects the brain and spinal cord. Leukoencephalopathy refers to abnormalities in the white matter of the brain, which is tissue containing nerve cell fibers (axons) that transmit nerve impulses.
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  • 04 Jan 2021
Topic Review
IMAGe Anomaly
The combination of intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies is commonly known by the acronym IMAGe. This rare syndrome has signs and symptoms that affect many parts of the body.
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  • 04 Jan 2021
Topic Review
IBMPFD
Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia (IBMPFD) is a condition that can affect the muscles, bones, and brain.
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  • 04 Jan 2021
Topic Review
IPEX Syndrome
Immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome primarily affects males and is caused by problems with the immune system. The immune system normally protects the body from foreign invaders, such as bacteria and viruses, by recognizing and attacking these invaders and clearing them from the body. However, the immune system can malfunction and attack the body's own tissues and organs instead, which is known as autoimmunity. IPEX syndrome is characterized by the development of multiple autoimmune disorders in affected individuals. Although IPEX syndrome can affect many different areas of the body, autoimmune disorders involving the intestines, skin, and hormone-producing (endocrine) glands occur most often. IPEX syndrome can be life-threatening in early childhood.
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