Updated: Marie+sperm+mania+upd

Causes imprinting disorders like Prader-Willi and Angelman syndromes. Meiosis/Gametogenesis

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Think of it this way: certain genes are "stamped" or "imprinted" to be active only when inherited from a specific parent. UPD disrupts this delicate balance. This disruption can lead to severe imprinting disorders, such as the well-known and Angelman syndrome . These syndromes arise when both copies of a specific chromosome region are inherited from only one parent, leading to the loss or duplication of critical gene activity. UPD typically occurs as a random, unpreventable error during the formation of egg or sperm cells or in the earliest stages of fetal development. UPD disrupts this delicate balance

If this keyword belongs to an indie game or visual novel (often hosted on developer platforms like Patreon, itch.io, or DLsite), the term is highly significant. UPD typically occurs as a random, unpreventable error