Age Not Only Factor In Down Syndrome
 |
| Photo credit: Grandma Julia and David - 4 days old, by Jessica Merz |
Although it is a fact that as women get older, they are more likely to have a child with Down Syndrome, other factors also play a role.
According to Markus Neuhäuser and Sven Krackow, from the Institute of Medical Informatics, Biometry and Epidemiology at University Hospital Essen, in Germany, the risk of a child being born with Down Syndrome is also dependent on how many existing siblings the child has and how big the gap is between the child and his immediate preceding sibling.
The research is published in Springer's journal Naturwissenschaften this week.
Neuhäuser and Krackow reviewed and analysed data from 1953 and 1972 (before abortion was widespread). They found that other factors, besides the mother's increasing age, were linked to the number of Down Syndrome cases.
Down Syndrome rates were significantly higher in older mothers in their first pregnancy than in older mothers who had already had children. Only late first pregnancies were more likely to produce a Down Syndrome baby, not late second or third pregnancies. In addition, the larger the gap between pregnancies, the higher the rates of Down Syndrome.
Down Syndrome is the result of the genetic abnormality Trisomy 21. Trisomy has been the focus of extensive medical research but the exact mechanism is still not understood. One feature common to most trisomies is an increase in frequency of trisomic pregnancies with increasing maternal age.
There is strong evidence for uterine selection against genetically disadvantaged embryos. However, as women approach the menopause and the risk of future infertility increases, this selection, or filtering stringency, is expected to relax.
Neuhäuser and Krackow's paper provides evidence that older mothers, who give birth to children with Down Syndrome, have a relaxed stringency of quality control of embryos (or relaxed filtering stringency), which increases the probability these women will bring children with developmental defects to full term.
They believe that this relaxed filtering stringency is an adaptive maternal response and it might explain why the rate of Down Syndrome accelerates with increasing maternal age.
These findings have important implications for the prevention of abnormal fetal development. The authors conclude that
clearly, identification of the relaxation control mechanisms and therapeutic restoration of a stringent screen holds promise not only for Down Syndrome.
1. Neuhäuser M & Krackow S (2006). Adaptive-filtering of trisomy 21: risk of Down Syndrome depends on family size and age of previous child. (Naturwissenschaften, DOI 10.1007/s00114-006-0165-3)
Read more
TODAY'S BOOK SUGGESTION:
Gifts: Mothers Reflect on How Children with Down Syndrome Enrich Their Lives
by Kathryn Lynard Soper (Author), Martha Sears (Foreword)
-- Having a baby with Down syndrome is not something most parents would willingly choose. Yet many who travel this path discover rich, unexpected rewards along the way.
In this candid and poignant collection of personal stories, sixty-three mothers describe the gifts of respect, strength, delight, perspective, and love, which their child with Down syndrome has brought into their lives.
The contributors to this collection have diverse personalities and perspectives, and draw from a wide spectrum of ethnicity, world views, and religious beliefs. Some are parenting within a traditional family structure; some are not.
Some never considered terminating their pregnancy; some struggled with the decision. Some were calm at the time of diagnosis; some were traumatized. Some write about their pregnancy and the months after giving birth; some reflect on years of experience with their child.
Their diverse experiences point to a common truth: The life of a child with Down syndrome is something to celebrate. These women have something to say--not just to other mothers but to all of us.
Paperback: 326 pages;Click to order/for more info: Gifts: Mothers Reflect on How Children with Down Syndrome Enrich Their Lives
Category: amniocentesis, birth defects, Down's Syndrome, Old Eggs, Too Old
0 comments