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Germinal and Somatic Trisomy 21 Mosaicism: How Common is it, What are the Implications for Individual Carriers and How Does it Come About?
University of Warwick.
Linköping University, Department of Clinical and Experimental Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
Karolinska Institute.
Karolinska Institute.
2010 (English)In: CURRENT GENOMICS, ISSN 1389-2029, Vol. 11, no 6, 409-419 p.Article in journal (Refereed) Published
Abstract [en]

It is well known that varying degrees of mosaicism for Trisomy 21, primarily a combination of normal and Trisomy 21 cells within individual tissues, may exist in the human population. This involves both Trisomy 21 mosaicism occurring in the germ line and Trisomy 21 mosaicism documented in different somatic tissues, or indeed a combination of both in the same subjects. Information on the incidence of Trisomy 21 mosaicism in different tissue samples from people with clinical features of Down syndrome as well as in the general population is, however, still limited. One of the main reasons for this lack of detailed knowledge is the technological problem of its identification, where in particular low grade/cryptic Trisomy 21 mosaicism, i.e. occurring in less than 3-5% of the respective tissues, can only be ascertained by fluorescence in situ hybridization (FISH) methods on large cell populations from the different tissue samples. In this review we summarize current knowledge in this field with special reference to the question on the likely incidence of germinal and somatic Trisomy 21 mosaicism in the general population and its mechanisms of origin. We also highlight the reproductive and clinical implications of this type of aneuploidy mosaicism for individual carriers. We conclude that the risk of begetting a child with Trisomy 21 Down syndrome most likely is related to the incidence of Trisomy 21 cells in the germ line of any carrier parent. The clinical implications for individual carriers may likewise be dependent on the incidence of Trisomy 21 in the relevant somatic tissues. Remarkably, for example, there are indications that Trisomy 21 mosaicism will predispose carriers to conditions such as childhood leukemia and Alzheimers Disease but there is on the other hand a possibility that the risk of solid cancers may be substantially reduced.

Place, publisher, year, edition, pages
Bentham Science Publishers Ltd , 2010. Vol. 11, no 6, 409-419 p.
Keyword [en]
Trisomy 21, mosaicism, germ line, fetus, childhood leukemia, cancer, Alzheimers Disease
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-59495DOI: 10.2174/138920210793176056ISI: 000281436800006OAI: diva2:352004
Available from: 2010-09-17 Created: 2010-09-17 Last updated: 2014-09-17

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Jonasson, Jon
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Molecular and Immunological PathologyFaculty of Health SciencesDepartment of Clinical Pathology and Clinical Genetics
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