Patau syndrome
Patau Syndrome is also known as Trisomy 13 as it is caused my an extra chromosome 13. This is similar to the more well-known Down's syndrome, except for that, the trisomy occurs on chromosome 21. Patau's is the least common non-lethal trisomies, affectin 1 in 10,000 live-births. Out of this 80% will have a full trisomy, with the remainder having partial trisomy (due to translocation or mosaicism)
Symptoms:
These can vary greatly, however almost all suffer from severe mental deficiency.
Physical:
- Polydactyly
- Rocker-bottom feet
- Cleft Palate (this occurs in about 60% of those with Patau Syndrome)
- Holoprosencephaly (forebrain in the embryo does not divide into two hemispheres)
- Microcephaly (small head size)
- Microphthalmia (small eyes)
- Congenital heart defect (affects around 80%)
- Seizures
Life expectancy:
45% of those born with Patau Syndrome die with one month and 70% within the first 6.
</uReferences
http://emedicine.medscape.com/article/947706-overview
http://www.lucinafoundation.org/birthdefects-trisomy13.html
http://www.trisomy.org/resources/soft-publications/trisomy-13-facts/