Molecular evolution of the plant R regulatory gene family

M. D. Purugganan, S. R. Wessler

Research output: Contribution to journalArticle

Abstract

Anthocyanin pigmentation patterns in different plant species are controlled in part by members of the myc-like R regulatory gene family. We have examined the molecular evolution of this gene family in seven plant species. Three regions of the R protein show sequence conservation between monocot and dicot R genes. These regions encode the basic helix-loop-helix domain, as well as conserved N-terminal and C-terminal domains; mean replacement rates for these conserved regions are 1.02 x 10-9 nonsynonymous nucleotide substitutions per site per year. More than one-half of the protein, however, is diverging rapidly, with nonsynonymous substitution rates of 4.08 x 10-9 substitutions per site per year. Detailed analysis of R homologs within the grasses (Poaceae) confirm that these variable regions are indeed evolving faster than the flanking conserved domains. Both nucleotide substitutions and small insertion/deletions contribute to the diversification of the variable regions within these regulatory genes. These results demonstrate that large tracts of sequence in these regulatory loci are evolving at a fairly rapid rate.

Original languageEnglish (US)
Pages (from-to)849-854
Number of pages6
JournalGenetics
Volume138
Issue number3
StatePublished - 1994

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vpr Genes
Plant Genes
Molecular Evolution
Regulator Genes
Poaceae
Helix-Loop-Helix Motifs
Nucleotides
Anthocyanins
Pigmentation
Proteins
Genes

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Molecular evolution of the plant R regulatory gene family. / Purugganan, M. D.; Wessler, S. R.

In: Genetics, Vol. 138, No. 3, 1994, p. 849-854.

Research output: Contribution to journalArticle

Purugganan, MD & Wessler, SR 1994, 'Molecular evolution of the plant R regulatory gene family', Genetics, vol. 138, no. 3, pp. 849-854.
Purugganan, M. D. ; Wessler, S. R. / Molecular evolution of the plant R regulatory gene family. In: Genetics. 1994 ; Vol. 138, No. 3. pp. 849-854.
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