SATELLITE I DNA
\sˈatəlˌa͡ɪt a͡ɪ dˌiːˌɛnˈe͡ɪ], \sˈatəlˌaɪt aɪ dˌiːˌɛnˈeɪ], \s_ˈa_t_ə_l_ˌaɪ_t aɪ d_ˌiː__ˌɛ_n_ˈeɪ]\
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Highly repetitive DNA sequences found in HETEROCHROMATIN, mainly near centromeres. They are composed of simple sequences (very short) (see MINISATELLITE REPEATS) repeated in tandem many times to form large blocks of sequence. Additionally, following the accumulation of mutations, these blocks of repeats have been repeated in tandem themselves. The degree of repetition is on the order of 1000 to 10 million at each locus. Loci are few, usually one or two per chromosome. They were called satellites since in density gradients, they often sediment as distinct, satellite bands separate from the bulk of genomic DNA owing to a distinct BASE COMPOSITION.
By DataStellar Co., Ltd
Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.