Question 1

is down syndrome always caused by a defect in the 21 chromosome?

Accepted Answer

Extra chromosome 21.: Either complete or partial trisomy for chromosome 21 is always responsible for down syndrome.

Question 2

what causes down syndrome?

Accepted Answer

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 translocation where only an extra piece of the chromosome is found.  It can be an isolated defect or an inherited defect.  Rare exotic forms include polyploidy and haploid forms and chimeras.  Sorry you asked?

Question 3

what are the different causes down syndrome?

Accepted Answer

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 of 21 chromosome is attached to another chromosome often chromosome 14.

Question 4

does teething cause down syndrome?

Accepted Answer

No: Down syndrome is a genetic problem and has nothing to do with teething.

Question 5

which type of mutation causes down syndrome?

Accepted Answer

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 is given by both parents to the fertile egg.If a parent adds their  2 nbr 21chm to the other parents nbr 21, 3 end up in the egg ; the excess 21 causes the  all the problems.Rare forms are causes by a extra piece of a 21, but that's another issue.

Question 6

av canal defect, can this cause down syndrome?

Accepted Answer

Other way around: Atrioventricular (av) canal defect is a relatively common congenital heart defect in children born with down syndrome.  Down syndrome "causes" av canal defects, not the other way around.  Av canal defect is a major congenital anomaly with the potential to cause severe symptoms.  However, in most cases, av canal defect can be repaired.  High levels of surgical skill is important for best outcomes.

Question 7

which type of chromosomal mutation causes down syndrome?

Accepted Answer

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 chromosomal abnormality.

Question 8

which type of radiation that can cause down syndrome to your infant?

Accepted Answer

None: Down syndrome is a chromosamal condition, not an x-ray induced condition.

Question 9

did synthroid (thyroxine) cause down syndrome baby?

Accepted Answer

No it did not: No synthroid (thyroxine) does not cause Down syndrome babies.

Question 10

i was wondering what are the biochemical processes that cause down syndrome people to be more prone to congenital heart diseases?

Accepted Answer

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 causes the heart to develop abnormally. Although 40-50% of patients with Down syndrome have congenital heart dis., and we know what causes down syndrome, we do not yet understand why this leads to heart defects (likely due to abnormal gene expression).

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Doctor answers about:

Down syndrome cause

A member asked:

Is down syndrome always caused by a defect in the 21 chromosome?

A member asked:

What causes down syndrome?

A member asked:

What are the different causes down syndrome?

A member asked:

Does teething cause down syndrome?

A member asked:

Which type of mutation causes down syndrome?

A member asked:

Av canal defect, can this cause down syndrome?

A member asked:

Which type of chromosomal mutation causes down syndrome?

A member asked:

Which type of radiation that can cause down syndrome to your infant?

A member asked:

Did synthroid (thyroxine) cause down syndrome baby?

A member asked:

I was wondering what are the biochemical processes that cause down syndrome people to be more prone to congenital heart diseases?

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