Abstract
During the mapping and sequencing of human ribosomal protein genes, we have found that U14 small nucleolar RNAs (snoRNAs) are encoded in introns of the ribosomal protein S13 gene. PCR cloning and sequencing have been employed to obtain the intron-containing (functional) human S13 gene and to eliminate a number of the processed pseudogenes. The S13 gene consists of six exons and five introns and spans a genomic region of 3.3 kb. U14 snoRNA genes are positioned in introns 3 and 5 of the S13 gene. A sequence comparison of the U14 genes in human andXenopus laevisrevealed that the regions involved in binding to 18S rRNA and the consensus (boxes C and D) of sequences for snoRNAs are highly conserved among the genes in the two species.
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