Abstract：
:Active endogenous transposable elements, useful tools for gene isolation, have not been reported from any legume species. An active transposable element was suggested to reside in the W4 locus that governs flower color in soybean. Through biochemical and molecular analyses of several revertants of the w4-m allele, we have shown that the W4 locus encodes dihydroflavonol-4-reductase 2 (DFR2). w4-m has arisen through insertion of Tgm9, a 20,548-bp CACTA-like transposable element, into the second intron of DFR2. Tgm9 showed high nucleic acid sequence identity to Tgmt*. Its 5' and 3' terminal inverted repeats start with conserved CACTA sequence. The 3' subterminal region is highly repetitive. Tgm9 carries TNP1- and TNP2-like transposase genes that are expressed in the mutable line, T322 (w4-m). The element excises at a high frequency from both somatic and germinal tissues. Following excision, reinsertions of Tgm9 into the DFR2 promoter generated novel stable alleles, w4-dp (dilute purple flowers) and w4-p (pale flowers). We hypothesize that the element is fractured during transposition, and truncated versions of the element in new insertion sites cause stable mutations. The highly active endogenous transposon, Tgm9, should facilitate genomics studies specifically that relate to legume biology.
journal_name
Geneticsjournal_title
Geneticsauthors
Xu M,Brar HK,Grosic S,Palmer RG,Bhattacharyya MKdoi
10.1534/genetics.109.107904subject
Has Abstractpub_date
2010-01-01 00:00:00pages
53-63issue
1eissn
0016-6731issn
1943-2631pii
genetics.109.107904journal_volume
184pub_type
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