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down syndrome cause

A 35-year-old member asked:
Dr. Nikolaos Zacharias
26 years experience Maternal-Fetal Medicine
Extra chromosome 21.: Either complete or partial trisomy for chromosome 21 is always responsible for down syndrome.

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A 33-year-old member asked:
Dr. William Goldie
48 years experience Pediatric Neurology
DNA defects: Chromosome 21 seems to be the cause. Two most common types are trisomy 21 where ther is an entire extra chromosome in each cell. The other is transl ... Read More
Dr. William Singer
51 years experience Pediatric Neurology
Extra chromosome: Down syndrom is caused by an extra number 21 chromosome.
A 29-year-old member asked:
Dr. Yash Khanna
57 years experience Family Medicine
Downs syndrome: Trisomy 21 when there is an extra chromosome at 21, mosaicism when some cells have trisomy and others not, robertson translocation [n which long arm o ... Read More
Dr. William Singer
51 years experience Pediatric Neurology
W varieties: The most common cause is trisomy 21, a situation with 3 number 21 chromosomes. A second possibility is a partial translocation of a piece of a 21 chr ... Read More
A 45-year-old male asked:
Dr. Jay Bradley
18 years experience LASIK Surgery
No: Down syndrome is a genetic problem and has nothing to do with teething.
A 32-year-old member asked:
Dr. James Ferguson
46 years experience Pediatrics
No : Down syndrome is an abnormality of chromosome numbers, not a trait or mutation in the gene code. During conception only one of chromosome of each pair ... Read More
A 44-year-old member asked:
Dr. Steven Neish
38 years experience Pediatric Cardiology
Other way around: Atrioventricular (av) canal defect is a relatively common congenital heart defect in children born with down syndrome. Down syndrome "causes" av cana ... Read More
A 49-year-old member asked:
Dr. Osman Farooq
20 years experience Pediatric Neurology
Trisomy 21: Down syndrome is also called trisomy 21. That means that there is a partial or complete third copy of the chromosome 21. It is the most common chrom ... Read More
A 47-year-old member asked:
Dr. Arnold Malerman
53 years experience Orthodontics
None: Down syndrome is a chromosamal condition, not an x-ray induced condition.
A 35-year-old member asked:
Dr. Yash Khanna
57 years experience Family Medicine
No it did not: No synthroid (thyroxine) does not cause Down syndrome babies.
A 41-year-old member asked:
Dr. David Malpass
33 years experience Pediatric Cardiology
Unknown: The heart is a very complex organ. We still do not fully understand how the normal heart develops in the fetus. We understand even less about what cau ... Read More
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