In 1960, Patau et al. first recognized the relation of trisomy 13 to a clinical syndrome. Incidence is estimated to be 1/4,000–1/10,000 live births.
Synonyms and Related Disorders
Patau syndrome
Genetics/Basic Defects
- 1.
Trisomy 13
- a.
Mechanism: due to meiotic nondisjunction
- i.
Maternal origin of the extra chromosome (90%)
- ii.
Stage of nondisjunction: mostly maternal meiosis I (vs. meiosis II in trisomy 18)
- iii.
Paternal origin of the extra chromosome (10%): The majority is primarily postzygotic mitotic errors.
- i.
- b.
Frequency: 75% of cases
- a.
- 2.
Translocation trisomy 13
- a.
Mechanism: de novo (75%) or familial transmission (25%)
- b.
Frequency: 20% of cases
- c.
Trisomy 13 due to t(13;13): The structural abnormalities are usually isochromosomes originating in mitosis.
- a.
- 3.
Mosaic trisomy 13
- a.
Mechanism: due to postzygotic (postfertilization) mitotic nondisjunction
- b.
Frequency: 5% of cases
- c.
Variable phenotype from full trisomy to near normal
- d....
- a.
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(2012). Trisomy 13 Syndrome. In: Chen, H. (eds) Atlas of Genetic Diagnosis and Counseling. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1037-9_235
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