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. 1994 Aug 11;22(15):3045–3052. doi: 10.1093/nar/22.15.3045

The human Y4 small cytoplasmic RNA gene is controlled by upstream elements and resides on chromosome 7 with all other hY scRNA genes.

R J Maraia 1, N Sasaki-Tozawa 1, C T Driscoll 1, E D Green 1, G J Darlington 1
PMCID: PMC310274  PMID: 7520568

Abstract

Ro ribonucleoproteins (RNP) constitute a class of evolutionarily conserved small cytoplasmic (sc) RNPs whose functions are unknown. In human cells four distinctive scRNAs designated hY1, hY3, hY4 and hY5 are synthesized by RNA polymerase III (pol III) and accumulate as components of Ro scRNPs. The previously isolated hY1 and hY3 genes contain upstream sequences similar to the class III promoters for U6 and 7SK snRNAs. Additional mammalian Y scRNA genes have been refractory to cloning due to interference from numerous hY-homologous pseudogenes and studies of hY RNA genes have been sparse. Although homologs of hY1 and hY3 RNAs exist in rodent cells, the smaller Y4 and Y5 RNAs do not which has allowed us to localize the hY4 scRNA gene to human chromosome 7 by assaying for its transcript in rodent X human somatic cell hybrids (SCH). A chromosome 7-enriched yeast artificial chromosome (YAC) library was then screened and the authentic hY4 sequence was isolated by strepavidin--biotin-mediated hybrid-selection followed by poly(dA)-tailing and hemispecific PCR. The region upstream of the hY4 sequence contains a TATAAAA motif centered at -26, a candidate proximal sequence element at -63, and three octamer-like sequences located between -260 and -200. hY4 RNA is readily detectable on Northern blots after transient transfection of the hY4 gene into mouse cells but not after transfection of a construct in which the 5' flanking region was deleted. SCHs and chromosome 7-enriched YACs were used to demonstrate that all four hY RNA genes reside on human chromosome 7.

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