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Clinical and hematologic findings in Noonan syndrome patients with PTPN11 gene mutations.
MedLine Citation:
PMID:  20954246     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Reports on Noonan syndrome (NS) have documented multiple types of coagulation defects and bleeding diathesis, and a wide range of clinical presentations. Early studies suggested that a large proportion of NS patients have coagulation defects, whereas more recent reports indicate low rates of coagulopathy. The aim of this study was to evaluate phenotypic characteristics, PTPN11 gene mutations, and hematological and coagulation parameters in 30 clinically diagnosed cases of NS. One of the NS patients had a history of easy bruising; however, his hematological and coagulation tests were normal. None of the other patients had clinical coagulation problems. In the NS group, values for platelet count, activity of factors XI, XII, and protein C were significantly lower than the corresponding means for the control group. However, the results of coagulation tests in the NS group were diagnostically inconclusive and only one patient had clinical signs of coagulopathy. Interestingly, two NS patients had low protein C activity. One of these children had an A1517C mutation and transient myelodysplasia. The other patient had a C1528G mutation in exon 13 that has not been reported previously. Neither of these individuals experienced a thrombotic event or any complication during approximately 3 years of follow-up. For all patients clinically diagnosed with NS, a thorough history of coagulation issues should be taken and first-line coagulation testing should be done to evaluate for bleeding diathesis. However, if these assessments reveal nothing abnormal, complications related to coagulation are unlikely and extensive testing is unnecessary.
Authors:
Murat Derbent; Yekta Öncel; Kürşad Tokel; Birgül Varan; Ayşegül Haberal; A Canan Yazici; Eric Legius; Namik Özbek
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of medical genetics. Part A     Volume:  152A     ISSN:  1552-4833     ISO Abbreviation:  Am. J. Med. Genet. A     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101235741     Medline TA:  Am J Med Genet A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2768-74     Citation Subset:  IM    
Copyright Information:
© 2010 Wiley-Liss, Inc.
Affiliation:
Baskent University Faculty of Medicine, Department of Pediatrics and Clinical Genetics, Ankara, Turkey. mderbent@baskent-ank.edu.tr
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