Down syndrome: genetic recombination and the origin of the extra chromosome 21.

@article{Hassold2000DownSG,
  title={Down syndrome: genetic recombination and the origin of the extra chromosome 21.},
  author={Terry J. Hassold and Stephanie L. Sherman},
  journal={Clinical genetics},
  year={2000},
  volume={57 2},
  pages={95-100}
}
Despite the clinical importance of trisomy 21, we have been ignorant of the causes of meiotic nondisjunction of chromosome 21. Recently, however, genetic mapping studies of trisomy 21 families have led to the identification of the first molecular correlate of human nondisjunction; i.e. altered levels and positioning of meiotic recombinational events. Specifically, increases in 0 exchange events or in distal-only or pericentromeric exchanges are significantly increased in trisomy 21-generating… CONTINUE READING

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Risk factors for trisomy

Q Yang, S Sherman, T Hassold
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