Tuesday, May 29, 2012

Trisomy 13 (Patau Syndrome)

Trisomy 13 (also called Patau syndrome) is a genetic disorder in which a person has three copies of genetic material fromchromosome 13, instead of the usual two copies. Rarely, the extra material may be attached to another chromosome (translocation).

Causes, incidence, and risk factors
Trisomy 13 occurs when extra DNA from chromosome 13 appears in some or all of the body's cells.
Trisomy 13 -- the presence of an extra (third) chromosome 13 in all of the cells.
Trisomy 13 mosaicism -- the presence of an extra chromosome 13 in some of the cells.
Partial trisomy -- the presence of a part of an extra chromosome 13 in the cells.
The extra material interferes with normal development.
Trisomy 13 occurs in about 1 out of every 10,000 newborns. Most cases are not passed down through families (inherited). Instead, the events that lead to trisomy 13 occur in either the sperm or the egg that forms the fetus.

#             Cleft lip or palate
#             Clenched hands (with outer fingers on top of the inner fingers)
#             Close-set eyes -- eyes may actually fuse together into one
#             Decreased muscle tone
#             Extra fingers or toes (polydactyly)
#             Hernias: umbilical hernia, inguinal hernia
#             Hole, split, or cleft in the iris (coloboma)
#             Low-set ears
#             Mental retardation, severe
#             Scalp defects (missing skin)
#             Seizures
#             Single palmar crease
#             Skeletal (limb) abnormalities
#             Small eyes
#             Small head (microcephaly)
#             Small lower jaw (micrognathia)
#             Undescended testicle (cryptorchidism)

Signs and tests
# The infant may have a single umbilical artery at birth. There are often signs of congenital heart disease, such as:

# Abnormal placement of the heart toward the right side of the chest instead of the left
# Atrial septal defect
# Patent ductus arteriosus
# Ventricular septal defect
# Gastrointestinal x-rays or ultrasound may show rotation of the internal organs.
# MRI or CT scans of the head may reveal a problem with the structure of the brain. The problem is called holoprosencephaly. It is the joining together of the two sides of the brain.
# Chromosome studies show trisomy 13, trisomy 13 mosaicism, or partial trisomy.

Treatment varies from child to child and depends on the specific symptoms.
More than 80% of children with trisomy 13 die in the first year.
Complications begin almost immediately. Most infants with trisomy 13 have congenital heart disease.
Complications may include:
# Breathing difficulty or lack of breathing (apnea)
# Deafness
# Feeding problems
# Heart failure
# Seizures
# Vision problems


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  40. Please add TRisomy.org as the Support Resource for your families. My full trisomy 13 child turned 13 years old today. There is hope living with trisomy 13 in some cases. There is a wealth of support online from families who've interconnected via online support and social media. Thank you for updating your information. ~ TA
    Support Groups
    Support Organization for Trisomy 18, 13 and Related Disorders (SOFT) -- www.trisomy.org
    Hope For Trisomy 13 and 18 -- www.hopefortrisomy13and18.org