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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"

GRN-related frontotemporal lobar degeneration results from mutations (pathogenic variants) in the GRN gene. This gene provides instructions for making a protein called progranulin. Progranulin is active in many different tissues in the body, where it helps control the growth, division, and survival of cells. Progranulin's function in the brain is not well understood, although it appears to play an important role in the survival of nerve cells (neurons).

Most mutations in the GRN gene prevent any progranulin from being produced from one copy of the gene in each cell. As a result, cells make only half the usual amount of progranulin. It is unclear how a shortage of this protein leads to the features of GRN-related frontotemporal lobar degeneration. However, studies have shown that the disorder is characterized by the buildup of a protein called TAR DNA-binding protein 43 (TDP-43) in certain brain cells. The TDP-43 protein forms clumps (aggregates) that may interfere with cell functions and ultimately lead to cell death. Researchers are working to determine how mutations in the GRN gene, and the resulting loss of progranulin, are related to a buildup of TDP-43 in the brain.

The features of GRN-related frontotemporal lobar degeneration result from the gradual loss of neurons in regions near the front of the brain called the frontal and temporal lobes. The frontal lobes are involved in reasoning, planning, judgment, and problem-solving, while the temporal lobes help process hearing, speech, memory, and emotion. The death of neurons in these areas causes problems with many critical brain functions. However, it is unclear why the loss of neurons occurs in the frontal and temporal lobes more often than other brain regions in people with GRN-related frontotemporal lobar degeneration.

MedlinePlus Genetics: Causes

","key":"forms","title":"What causes GRN-related frontotemporal lobar degeneration?"},{"bodyHtml":"

Behavioral changes are the most common early signs of GRN-related frontotemporal lobar degeneration. These include marked changes in personality, judgment, and insight. It may become difficult for affected individuals to interact with others in a socially appropriate manner. Affected people may also become easily distracted and unable to complete tasks. They increasingly require help with personal care and other activities of daily living.

Many people with GRN-related frontotemporal lobar degeneration develop progressive problems with speech and language (aphasia). Affected individuals may have trouble speaking, remembering words and names (dysnomia), and understanding speech. Over time, they may completely lose the ability to communicate (mutism). People with this condition also experience a decline in intellectual function (dementia).

Some people with GRN-related frontotemporal lobar degeneration also develop movement disorders, such as parkinsonism and corticobasal syndrome. The signs and symptoms of these disorders include tremors, muscle stiffness (rigidity), unusually slow movement (bradykinesia), walking problems (gait disturbance), involuntary muscle spasms (myoclonus), uncontrolled muscle tensing (dystonia), and an inability to carry out purposeful movements (apraxia).

Source: MedlinePlus Genetics

Frontotemporal dementia with parkinsonism-17

Frontotemporal dementia with parkinsonism-17 (FTDP-17) is a brain disorder. It is part of a group of conditions, called frontotemporal dementia or frontotemporal degeneration, that are characterized by a loss of nerve cells (neurons) in areas of the brain called the frontal and temporal lobes. Over time, a loss of these cells can affect personality, behavior, language, and movement.

The signs and symptoms of FTDP-17 usually become noticeable in a person's forties or fifties. Most affected people survive 5 to 10 years after the appearance of symptoms, although a few have survived for two decades or more.

Changes in personality and behavior are often early signs of FTDP-17. These changes include a loss of inhibition, inappropriate emotional responses, restlessness, neglect of personal hygiene, and a general loss of interest in activities and events. The disease also leads to deterioration of cognitive functions (dementia), including problems with judgment, planning, and concentration. Some people with FTDP-17 develop psychiatric symptoms, including obsessive-compulsive behaviors, strongly held false beliefs (delusions), and false perceptions (hallucinations). It may become difficult for affected individuals to interact with others in a socially appropriate manner. They increasingly require help with personal care and other activities of daily living.

Many people with FTDP-17 develop problems with speech and language. They may have trouble finding words, confuse one word with another (semantic paraphasias), and repeat words spoken by others (echolalia). Difficulties with speech and language worsen over time, and most affected individuals eventually lose the ability to communicate.

FTDP-17 is also characterized by problems with movement that worsen over time. Many affected individuals develop features of parkinsonism, including tremors, rigidity, and unusually slow movement (bradykinesia). As the disease progresses, most affected individuals become unable to walk. Some people with FTDP-17 also have restricted up-and-down eye movement (vertical gaze palsy) and rapid abnormal movements of both eyes (saccades).

Causes

FTDP-17 is caused by mutations in the MAPT gene. This gene is located on chromosome 17, which is how the disease got its name.

The MAPT gene provides instructions for making a protein called tau. This protein is found throughout the nervous system, including in neurons in the brain. It is involved in assembling and stabilizing microtubules, which are rigid, hollow fibers that make up a cell's structural framework (the cytoskeleton). Microtubules help cells maintain their shape, assist in the process of cell division, and are essential for the transport of materials within cells.

Mutations in the MAPT gene disrupt the normal structure and function of tau. The defective protein forms abnormal clumps within neurons and other brain cells. However, it is unclear what effect these clumps have on cell function and survival. FTDP-17 is characterized by the gradual death of cells in the frontal and temporal lobes of the brain. The frontal lobes are involved in reasoning, planning, judgment, and problem-solving, while the temporal lobes help process hearing, speech, memory, and emotion. A loss of cells in these brain regions leads to personality changes, speech difficulties, and the other features of FTDP-17.

FTDP-17 is one of several related diseases known as tauopathies, which are characterized by an abnormal buildup of tau in the brain.

MedlinePlus Genetics: Causes

MedlinePlus: Frontotemporal dementia with parkinsonism-17

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