Centromeres

A centromere is a region of DNA found in the middle of a chromosome. It is important for the regulation of genetic inheritance and plays a key role in cell division. In eukaryotic cells (those with a nucleus), each chromosome has one centromere, but in some cases multiple centromeres can appear on one chromosome. The centromere is responsible for attaching the sister chromatids (copies of the same chromosome) after replication, and for aligning them correctly during cell division. This makes it essential for the proper segregation of chromosomes during meiosis and mitosis, and therefore the maintenance of chromosome number in daughter cells. Understanding centromeres is important in many fields of biology, from cytogenetics to cancer research.