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Why are monozygotic twins different?
MedLine Citation:
PMID:  21142845     Owner:  NLM     Status:  Publisher    
Abstract Although popularly designated as "identical", monozygotic (MZ) twins are rarely identical. Much has been speculated on the origin of MZ twins and several theories have been proposed. Post-fertilization events, such as chromosomal mosaicism, skewed X-inactivation and imprinting mechanisms, as well as other epigenetic mechanisms are responsible for the differences between MZ twins. Numerous discordant MZ twins have been reported including discordance for lateral asymmetry, major malformation, growth and intrauterine death of the co-twin. This discrepancy may have long-term implications on complex diseases and their predisposition, organ transplantation and interpretation of twin-based studies. We reviewed the genotypic and phenotypic differences between MZ twins and discuss their main causes.
Sara Silva; Yolanda Martins; Alexandra Matias; Isaac Blickstein
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-13
Journal Detail:
Title:  Journal of perinatal medicine     Volume:  -     ISSN:  1619-3997     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0361031     Medline TA:  J Perinat Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Obstetrics and Gynecology, University Hospital of S. João, Medical Faculty of Porto, Porto, Portugal.
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