Assembly of The NPC
As the NPC controls access to the genome, it is essential that it exists in large amounts in areas of the cell cycle where plenty of transcription is necessary. For example, cycling mammalian and yeast cells double the amount of NPC in the nucleus between the G1 and G2 phase of cell Mitosis. And oocytes accumulate large numbers of NPCs to prepare for the rapid mitosis that exists in the early stages of development. Interphase cells must also keep up a level of NPC generation to keep the levels of NPC in the cell constant as some may get damaged. Some cells can even increase the NPC numbers due to increased transcriptional demand.
Read more about this topic: Nuclear Pore
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