Somatic Cell and Molecular Genetics

, Volume 22, Issue 2, pp 87–103 | Cite as

New mutations and phenotypes associated with glutamate and aspartate transport in Chinese hamster ovary (CHO-K1) cells

  • Robert P. IgoJr.
  • John F. Ash


Two new Chinese hamster ovary cell (CHO-K1) mutants lacking amino acid transport System XAG activity were isolated by [3H]aspartate suicide selection. These null mutants, Dd-B6 and Dd-B7, were analyzed by somatic cell hybridization, along with previously described partial-function mutants, Ed-A1 and Ed-B8. With respect to System XAG activity, all four mutations fell into a single complementation group. By quantitative assay, the mutations in Ed-A1 and Ed-B8 behaved as simple recessives in fusions with wild type cells, while those in Dd-B6 and Dd-B7 were codominant. We have discovered that Ed-A1 and Ed-B8 are highly permeable to smal neutral molecules. This high permeability phenotype was dominant to wild-type. Northern, Southern, and Western analyses indicated that System XAG in CHO is not closely related to any of the three well characterized glutamate transporters represented by GLT-1, EAAC1 or GLAST.


Glutamate Wild Type Cell Chinese Hamster Ovary Cell Chinese Hamster Ovary Null Mutant 
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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Robert P. IgoJr.
    • 1
  • John F. Ash
    • 1
  1. 1.Department of Neurobiology and Anatomy, School of MedicineUniversity of UtahSalt Lake City Utah

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