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Mol Cell Biol. 1985 August; 5(8): 2123-2130

Sequence organization and developmental expression of an interspersed, repetitive element and associated single-copy DNA sequences in Dictyostelium discoideum.

A R Kimmel and R A Firtel

ABSTRACT

We have examined the genomic organization and developmental expression pattern of a short, transcribed, interspersed repeat element and its associated single-copy sequences. We have previously shown that 1% of the polyadenylated [poly(A)+] RNA from vegetative cells contains sequences that hybridize to this repeat. The complementary RNA is heterogeneous in size, and 90% of its mass hybridizes to single-copy DNA. In this study, we examined a series of genomic DNAs and cDNAs derived from poly(A)+ RNAs which are complementary to the repeat. Comparisons of sequence data from various genomic and cDNA clones indicated that (AAC)n X (GTT)n is the common sequence element. The tandem repeat occurred in approximately 100 short segments (approximately 35 to 150 base pairs) per haploid genome interspersed with single-copy DNA. Probes from regions adjacent to this element hybridized to unique restriction fragments on DNA blots and unique poly(A)+ RNA species on RNA blots. The (AAC)n X (GTT)n sequence was asymmetrically transcribed with only (AAC)n sequences represented in RNA. The repeat was localized within the transcribed regions of several genes and 70 base pairs 5' to the transcription initiation site of another gene. Individual (AAC)n-containing RNAs exhibited a developmental pattern of expression suggestive of the coordinate expression of many AAC gene family members.

Mol Cell Biol. 1985 August; 5(8): 2123-2130




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