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Molecular evolution of the metallothionein gene Mtn in the melanogaster species group: results from Drosophila ananassae.

W Stephan, V S Rodriguez, B Zhou and J Parsch
Genetics September 1, 1994 vol. 138 no. 1 135-143
W Stephan
Department of Zoology, University of Maryland, College Park 20742.
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V S Rodriguez
Department of Zoology, University of Maryland, College Park 20742.
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B Zhou
Department of Zoology, University of Maryland, College Park 20742.
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J Parsch
Department of Zoology, University of Maryland, College Park 20742.
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Abstract

Three distinctly different alleles of the metallothionein gene Mtn have been identified in natural Drosophila melanogaster populations: Mtn.3, Mtn1, and Dp(Mtn1), where the latter designates a tandem duplication of Mtn1. In Drosophila simulans, only Mtn.3-type alleles have been found. It has been suggested that Mtn.3 is the ancestral allele and demonstrated that a presumed two-step transition from Mtn.3 to Mtn1 to Dp(Mtn1) is accompanied by an approximate 5-fold increase in RNA levels. We analyzed the evolutionary genetics of the Mtn locus of Drosophila ananassae, a distant relative of D. melanogaster and D. simulans within the melanogaster species group. The Mtn gene of D. ananassae is most similar to Mtn.3: (i) it is identical with Mtn.3 at the amino acid level, but differs from Mtn1 in its terminal codon; (ii) its 3' UTR contains a characteristic extra DNA segment of about 50 bp which is present in Mtn.3, but lacking in Mtn1; (iii) duplications of Mtn were not found in a worldwide sample of 110 wild D. ananassae chromosomes. However, the intron of the Mtn gene in D. ananassae is only 69 bp long, whereas the length of the Mtn.3 and Mtn1 introns is 265 bp; and it lacks a polypyrimidine stretch upstream of the 3' splice site in contrast to the much greater pyrimidine-richness found in the Mtn.3 and Mtn1 introns. A short intron (67 bp) was also identified in a D. pseudoobscura Mtn allele, suggesting that the short intron is the ancestral form and that the transition from the short to the long intron occurred within the melanogaster species group.(ABSTRACT TRUNCATED AT 250 WORDS)

  • Copyright © 1994 by the Genetics Society of America
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Volume 138 Issue 1, September 1994

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Molecular evolution of the metallothionein gene Mtn in the melanogaster species group: results from Drosophila ananassae.

W Stephan, V S Rodriguez, B Zhou and J Parsch
Genetics September 1, 1994 vol. 138 no. 1 135-143
W Stephan
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
V S Rodriguez
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
B Zhou
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J Parsch
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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Citation

Molecular evolution of the metallothionein gene Mtn in the melanogaster species group: results from Drosophila ananassae.

W Stephan, V S Rodriguez, B Zhou and J Parsch
Genetics September 1, 1994 vol. 138 no. 1 135-143
W Stephan
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
V S Rodriguez
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
B Zhou
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J Parsch
Department of Zoology, University of Maryland, College Park 20742.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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