cajal body

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(Biyoloji) Cajal bodies (CBs) are spherical sub-organelles of 0.3-1.0 µm in diameter found in the nucleus of proliferative cells like embryonic cells and tumor cells, or metabolically active cells like neurons. In contrast to cytoplasmic organelles, CBs lack any phospholipid membrane which would separate their content, largely consisting of proteins and RNA, from the surrounding nucleoplasm. They were first reported by Santiago Ramón y Cajal in 1903, who called them nucleolar accessory bodies due to their association with the nucleoli in neuronal cells.[1] These structures were forgotten and later rediscovered by electron microscopists and named coiled bodies according to their appearance as coiled threads on EM images. More recently, to simplify the nomenclature the coiled bodies were renamed after their discoverer.[2] Research on CBs was accelerated after discovery and cloning of the marker protein p80/Coilin.[3] So far, CBs were implicated in important RNA-related metabolic processes such as snRNPs biogenesis, maturation and recycling, histone mRNA processing and telomere maintenance

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