Non-Mendelian regulation and allelic variation of methionine-rich delta-zein genes in maize |
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Authors: | Yongrui Wu Wolfgang Goettel Joachim Messing |
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Institution: | (1) Waksman Institute of Microbiology, Rutgers University, 190 Frelinghuysen Road, Piscataway, NJ 08854, USA |
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Abstract: | Sufficient methionine levels in the seed are critical for the supply of a balanced diet for feed and food. Currently, animal
feed is supplemented with chemically synthesized methionine, which could be completely replaced with naturally synthesized
methionine. However, insufficient levels of methionine are due to alleles of two genes in the maize genome that are expressed
during seed development, which have a high percentage of methionine codons, ranging from 23 to 28%, while free methionine
is very low. The two genes, dzs10 and dzs18, belong to the prolamin gene family that arose during the evolution of the grasses and were duplicated during a whole genome
duplication event. We have found several dzs10 and dzs18 null alleles caused either by transposon insertion or frame shift mutations. Maize seeds with null mutations of both genes
have a normal phenotype in contrast to other prolamin genes, explaining the accumulation of methionine deficiency in normal
breeding efforts. Moreover, the trans-regulation of these genes deviates from Mendelian inheritance. One allele of the regulatory
locus dzr1 is inherited in a parent-of-origin fashion, while another allele appears to prevent Mendelian segregation of the high-methionine
phenotype in backcrosses.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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