Abstract
Previous studies on human DNA have shown that the 3′ poly(A) tracts of Alu elements may display considerable genetic polymorphism. To explore whether this marker type is generally applicable in mammalian genomes, I analyzed porcine SINEs. A database screening revealed 17 porcine sequences with significant homology to a previously identified pig SINE. The occurrence in the database suggested a SINE frequency of one copy every 12 kb of pig DNA. All SINEs contained a 3′ poly(A) tract with an average of 12 uninterrupted adenines. The repetitive regions were analyzed for polymorphism by locus-specific PCR amplification. Allelic length variation (two to five alleles among 10 pigs) was found at 8 out of 10 loci investigated, in most cases probably because of varying number of iterated adenine residues. There was a positive relationship between repeat length and the degree of polymorphism. Stable Mendelian inheritance was documented in 200 meioses each at four loci. The high genomic frequency of SINEs implies that a potentially informative marker may be found near any gene or in any cosmid clone. These SINE 3′ poly(A) polymorphisms, termed SINEVA [SINE variable poly(A)s], thus provide an abundant and useful class of genetic marker in mammalian genomes.
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Ellegren, H. Variable SINE 3′ poly(A) sequences: an abundant class of genetic markers in the pig genome. Mammalian Genome 4, 429–434 (1993). https://doi.org/10.1007/BF00296816
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DOI: https://doi.org/10.1007/BF00296816