Biochemical Genetics

, Volume 23, Issue 5–6, pp 405–422 | Cite as

The expression of human glycerol-3-phosphate dehydrogenase in human/rodent somatic-cell hybrids

  • Yvonne Edwards
  • S. Lynn McMillan
  • Cay Kielty
  • Marie-Anne Shaw
Article
  • 19 Downloads

Abstract

Our previous studies using rodent/human somatic-cell hybrids suggested that the expression of human mitochondrial glycerol-3-phosphate dehydrogenase (GPDM) is dependent on the presence of human mitochondria. This has now been tested directly by analysis of GPDM activity in a series of nine hybrid-cell lines, four segregating human chromosomes and five losing rodent chromosomes (reverse segregants). The chromosome composition of the hybrids was deduced from analysis of biochemical markers and examination of G- and G11-banded metaphase spreads and the mitochondrial content was determined by Southern blot analysis, using cloned mouse and human mtDNA sequences as probes. We found that the mtDNA species present in these hybrids correlated exactly with the pattern of chromosome segregation such that the conventional hybrids contained rodent mtDNA and the reverse segregants human mtDNA. However, the pattern of GPDM expression was not directly correlated with the species of chromosomes or mitochondria present: all the hybrids showed strong rodem GPDM activity and two from each class of hybrid also showed human GPDM activity but the other hybrids were negative for human GPDM. We conclude that rodent GPDM readily integrates into human mitochondria, that the expression of rodent GPDM is not dependent on the presence of rodent mitochondria, and that GPDM is not coded by mtDNA. Human GPDM either is not capable of being inserted into the rodent mitochondrial membrane or is regulated in some way in the hybrid cells by an unidentified rodent factor.

Key words

glycerol-3-phosphate dehydrogenase mitochondria mtDNA somatic-cell hybrids 

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Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • Yvonne Edwards
    • 1
  • S. Lynn McMillan
    • 1
  • Cay Kielty
    • 2
  • Marie-Anne Shaw
    • 3
  1. 1.MRC Human Biochemical Genetics Unit, The Galton LaboratoryUniversity College LondonLondonU.K.
  2. 2.Department of BiochemistryUniversity of Manchester Medical SchoolManchesterU.K.
  3. 3.MRC Blood Group UnitUniversity College LondonLondonU.K.

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