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expand all sections collapse all sections  Oryza sativa Gene "du1"
ID 16324
Name du1 (GENE SYMBOL)
Synonyms (3)
GRAMENE GENEGR:0060261
Type Gene
Species Oryza sativa (Oryza sativa) [ GR_tax:013681 ]
Germplasm
Description "Dull" mutation lowers amylose content in endosperm (2.0-5.7% in mutant lines,
15.7% in original cv. Kinmaze). Grains have intermediate degree of translucence
but character is expressed only when grains are dry (unlike floury mutants). I2-
KI staining is intermediate between Kinmaze (blue) and waxy (brown). Dull
endosperm mutants have closely packed squarish endosperm cells that are
compactly filled with compound starch granules like those of waxy mutants.
Endosperm cell surface is more uneven than Kinmaze but less than that of waxy
mutants. Du1, encodes for Prp1, a member of the pre-mRNA processing protein
family. It is expressed mainly in panicles and affects the starch biosynthesis
by regulating the pre-mRNA splicing of Waxy gene (Wx, GR:0061010) and expression
of other key genes involved in starch biosynthesis. It acts upstream of Wx gene
in starch biosynthesis process. As reported by Zeng et al. (2007), the non-
synonymous SNP mutation (G/A) in du1 at position 1742b in the first exon of cDNA
results in the substitution of Serine (S) by Asparagine (N) at amino acid
position position 581. This substitution was found to be present in the TPR7
(tetratric peptide repeat) domain at the C-terminal and may affect its
interaction with other proteins leading to functional inefficiency (not a total
loss of function). Du1 has about 73% identity with the Du1L (Dull 1 like;
GR:0101268) gene located on chromosome-1.
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