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. 1994 Dec 15;13(24):6115–6124. doi: 10.1002/j.1460-2075.1994.tb06958.x

Sex-reversing mutations affect the architecture of SRY-DNA complexes.

A Pontiggia 1, R Rimini 1, V R Harley 1, P N Goodfellow 1, R Lovell-Badge 1, M E Bianchi 1
PMCID: PMC395591  PMID: 7813448

Abstract

The testis determining factor, SRY, is a DNA binding protein that causes a large distortion of its DNA target sites. We have analysed the biochemical properties of the DNA binding domains (HMG-boxes) of mutant SRY proteins from five patients with complete gonadal dysgenesis. The mutant proteins fall into three categories: two bind and bend DNA almost normally, two bind inefficiently but bend DNA normally and one binds DNA with almost normal affinity but produces a different angle. The mutations with moderate effect on complex formation can be transmitted to male progeny, the ones with severe effects on either binding or bending are de novo. The angle induced by SRY depends on the exact DNA sequence and thus adds another level of discrimination in target site recognition. These data suggest that the exact spatial arrangement of the nucleoprotein complex organized by SRY is essential for sex determination.

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Selected References

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