Top
10
Doctor insights on: Mosaic Down Syndrome

Share
1

1
Do you think an adult could have mosaic down syndrome?

Do you think an adult could have mosaic down syndrome?

Accounts for 1% DS: Mosaicism is encountered in ds patients & I have followed one in the past. By definition, some tissues are composed of cells with normal information & other tissues have the abnormal, but the mix could vary greatly in the percentage of either. Functional outcome depends on that blend & whether the abnormally derived tissues compose critical structures like brain, blood, reproductive organs, etc. ...Read more

Dr. Kathryn Akin
641 doctors shared insights

Down Syndrome (Definition)

Down syndrome is the classic presentation clinically of the congenital malformation syndrome also known as Trisomy 21. Classic features may include simian creases, epicanthal folds, upslanting palpebral fissures, flat nasal bridge, hypertelorism, low set ears, endocardial cushion defects of the heart, atlanto-axial joint instability, blood ...Read more


2

2
Is there a type of mosaic Down syndrome that doesn't require the mutation to come from either parent to have a downs child?

Is there a type of mosaic Down syndrome that doesn't require the mutation to come from either parent to have a downs child?

Yes: A mosaic down syndrome child can come from a normal egg and normal sperm, produced by normal parents. The fertilized egg would start out normal with 46 chromosomes. It can divide into 2 normal cells, which themselves divide again. If on one of the early divisions, one cell ends up with an extra #21 chromosome and survives to continue dividing, the child will be mosaic with some trisomy 21 cells. ...Read more

See 1 more doctor answer
3

3
How to know if the baby is Down syndrome or mosaic down without blood test?

How to know if the baby is Down syndrome or mosaic down without blood test?

Why do you ask?: You're going to need labs to determine this. Please forgive my frankness. Having a child with possible Down's is an extremely serious business and anyone who would trivialize this by saying, "Let's skip the labs that will establish the diagnosis" is doing both the child and the family a grave disservice. ...Read more

See 1 more doctor answer
4

4
What is down syndrome?

What is down syndrome?

Chromosome defect: Ds is one of the more common chromosome(c) defects that can survive pregnancy (many others miscarry).Eggs are supposed to have a single 21c & combine with the 21 from dads normal sperm.Here a pair of moms 21c +dad's 21 creates a baby with the extra 21c in all tissues.This extra material confuses the creation of body parts causing ds..Various prenatal tests can pick up signs early on. ...Read more

5

5
What causes down syndrome?

What causes down syndrome?

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? ...Read more

See 1 more doctor answer
6

6
Is Down syndrome inherited?

Is Down syndrome inherited?

Not usually: The only way to inherit down syndrome is if one parent has down syndrome and passes 2 copies of chromosome 21. Few people with ds reproduce, so that is not usually a factor. ...Read more

See 2 more doctor answers
7

7
How is down syndrome treated?

How is down syndrome treated?

Medical/education: Children with Downs Syndrome have special medical and educational needs that should be determined in each individual. Doctors and Psychologists or educational specialists can determine what the needs are and how best to meet them. ...Read more

See 1 more doctor answer
8

8
Why is my baby down syndrome?

Why is my baby down syndrome?

Chromosome defect: Ds is one of the more common chromosome(c) defects that can survive pregnancy (many others miscarry).Eggs are supposed to have a single 21c & combine with the 21 from dads normal sperm.In ds the pair of moms 21c +dad's 21 creates a baby with the three 21c in all tissues.This extra material confuses the creation of body parts causing ds..Various prenatal tests can pick up signs early on. ...Read more

9

9
How is Down syndrome treated?

How is Down syndrome treated?

Supportive care: Down syndrome has a well recognized pattern of obvious features and several common vulnerabilities. An evaluation for treatable heart defects and other problems helps assure the patient with best chance at a good life. Supportive care for their academic and growth challenges is also required.With modern health care, these patients can live well into their 60's in a protected environment. ...Read more

10

10
Why does Down syndrome happen?

Mistake in chromosom: During the formation of normal eggs or sperm the chromosome(c) pairs are supposed to split leaving one of each in the egg/sperm.At conception the joining of egg/sperm brings together the pair & as tissue grows it has the proper number in each cell. With ds the egg has a pair of 21c and at conception a triple 21 is created. All cells derived after will have an extra 21 & become a ds child. ...Read more