The ribosomal RNA genes ofTriturus vulgaris meridionalis are clustered at variable and often multiple chromosomal loci. The rDNA repeats exhibit only a limited and discrete length heterogeneity which is accounted for by the non-transcribed spacer (NTS). Interestingly, sequences homologous to the NTS are clustered outside the ribosomal loci. Clones containing such 'non ribosomal sequences' have been isolated from a genomic library ofT. v. meridionalis and analyzed by restriction mapping. These sequences appear to consist mostly of repetitive Bam HI fragments ranging from 500 bp to 1000 bp. The Bam HI fragments are internally repetitious and highly homologous to each other.
Genomic organization of ribosomal DNA and related sequences in Triturus
DE LUCCHINI, STEFANIA;
1988
Abstract
The ribosomal RNA genes ofTriturus vulgaris meridionalis are clustered at variable and often multiple chromosomal loci. The rDNA repeats exhibit only a limited and discrete length heterogeneity which is accounted for by the non-transcribed spacer (NTS). Interestingly, sequences homologous to the NTS are clustered outside the ribosomal loci. Clones containing such 'non ribosomal sequences' have been isolated from a genomic library ofT. v. meridionalis and analyzed by restriction mapping. These sequences appear to consist mostly of repetitive Bam HI fragments ranging from 500 bp to 1000 bp. The Bam HI fragments are internally repetitious and highly homologous to each other.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
