D2I2.
genetic

Pelizaeus–Merzbacher disease

Pelizaeus–Merzbacher disease is an disorder that damages oligodendrocytes in the central nervous system. It is caused by in proteolipid 1 (PLP1), a major myelin protein. It is characterized by a decrease in the amount of insulating myelin surrounding the nerves (hypomyelination) and belongs to a group of diseases referred to as leukodystrophies.

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Plain-language summary adapted from Wikipedia. Not medical advice.