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J. Cell Biol.,
Volume 140, Number 5, March 9, 1998 1137-1147

* Department of Biochemistry, University of Connecticut Health Center, Farmington, Connecticut 06032-3305, and The cytoplasmic dynein light chain Tctex1 is
a candidate for one of the distorter products involved in
the non-Mendelian transmission of mouse t haplotypes.
It has been unclear, however, how the t-specific mutations in this protein, which is found associated with cytoplasmic dynein in many tissues, could result in a male
germ cell-specific phenotype. Here, we demonstrate
that Tctex1 is not only a cytoplasmic dynein component, but is also present both in mouse sperm and Chlamydomonas flagella. Genetic and biochemical dissection of the Chlamydomonas flagellum reveal that
Tctex1 is a previously undescribed component of inner
dynein arm I1. Combined with the recent identification
of another putative t complex distorter, Tctex2, within
the outer dynein arm, these results support the hypothesis that transmission ratio distortion (meiotic drive) of
mouse t haplotypes involves dysfunction of both flagellar inner and outer dynein arms but does not require
the cytoplasmic isozyme.
Department of Anatomy and Cell Biology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140
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