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Co‐evolution of base composition and codon usage in Xenopus laevis and human globin genes with long‐range DNA organization of their genome
Author(s) -
Moreau J.,
Scherrer K.
Publication year - 1987
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(87)80342-3
Subject(s) - xenopus , linker , gene , genome , biology , intron , genetics , gc content , coding region , dna , globin , human genome , codon usage bias , computer science , operating system
Eucaryotic DNA is punctuated by many A+T‐rich segments that we named A+T‐rich linkers. Two types of these A+T‐rich linkers can be distinguished: (i) isolated A+T‐rich linkers, and (ii) A+T‐rich linkers crowded in clusters. We have analysed the distribution of A+T‐rich linker across the α‐ and β‐globin gene domain in Xenopus laevis and human genomes using isodenaturation and electron microscopy. Comparison of our data with those previously obtained for the avian globin genes leads us to conclude that genes can be harboured indifferently in either domain. A correlation is established between the presence of A+T‐rich linker inside introns and flanking regions and the A+T content of the coding sequence. For the coding sequence, a high A+T content is strongly correlated with high A+T content in the codon's third position and weakly in the first position.