Molecular Biology and Evolution, Vol 11, 426-435, Copyright © 1994 by Society for Molecular Biology and Evolution
SR Palumbi and CS Baker
Powerful analyses of population structure require information from multiple
genetic loci. To help develop a molecular toolbox for obtaining this
information, we have designed universal oligonucleotide primers that span
conserved intron-exon junctions in a wide variety of animal phyla. We test
the utility of exon-primed, intron-crossing amplifications by analyzing the
variability of actin intron sequences from humpback, blue, and bowhead
whales and comparing the results with mitochondrial DNA (mtDNA) haplotype
data. Humpback actin introns fall into two major clades that exist in
different frequencies in different oceanic populations. It is surprising
that Hawaii and California populations, which are very distinct in mtDNAs,
are similar in actin intron alleles. This discrepancy between mtDNA and
nuclear DNA results may be due either to differences in genetic drift in
mitochondrial and nuclear genes or to preferential movement of males, which
do not transmit mtDNA to offspring, between separate breeding grounds.
Opposing mtDNA and nuclear DNA results can help clarify otherwise hidden
patterns of structure in natural populations.
ORIGINAL ARTICLE
Contrasting population structure from nuclear intron sequences and mtDNA of humpback whales
Kewalo Marine Lab, University of Hawaii 96813.
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