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Nucleic Acids Research, 1983, Vol. 11, No. 16 5541-5553
© 1983

MOLECULAR BIOLOGY

Chromosomal arrangement of leghemoglobin genes in soybean

Jong S. Lee, Gregory G. Brown and Desh Pal S. Verma+

Department of Biology, McGill University 205 Docteur Penfield Avenue, Montreal H3A 1B1, Canada

+To whom reprint requests should be addressed

Received April 6, 1983. Accepted July 1, 1983.

A cluster of four different legherooglobin (Lb) genes was isolated from AluI-Haelll and EcoRI genomic libraries of soybean in a set of overlapping clones which together include 45 kilobases (kb) of contiguous DNA. These four genes, including a pseudogene, are present in the same orientation and are arranged in the order: 5'-Lba-Lbc1-Lb {psi};-Lbc3-3'. The intergenic regions average 2.5 kb. In addition to this main Lb locus, there are other Lb genes which do not appear to be contiguous to this locus. A sequence probably common to the 31 region of Lb loci was found flanking the Lbc3 gene. The 3' flanking region of the main Lb locus also contains a sequence that appears to be expressed more abundantly in root tissue. Another sequence which is primarily expressed in root and leaf is found 5' to two Lb loci. Overall, the main legheraoglobin locus is similar in structure to the mammalian globin gene loci.


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