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- W2022093232 abstract "Abstract Noonan syndrome (NS) is a genetically heterogeneous disorder caused most commonly by activating mutations in PTPN11 . We report a patient with hypotonia, developmental delay and clinical features suggestive of NS. High‐resolution chromosome analysis was normal, and sequence analyses of PTPN11 , SOS1 , KRAS , BRAF , RAF1 , MEK , and MEK2 were also normal. Array CGH revealed a single copy gain of 9 BAC clones at 12q24.11q24.21 (8.98 Mb in size), which encompassed the PTPN11 locus at 12q24.13 and was confirmed by FISH analysis. Shchelochkov et al. [Shchelochkov et al. (2008); Am J Med Genet Part A 146A:1042–1048] reported a similar case and speculated that such duplications might account for 15–30% of NS cases with no detectable mutation in NS genes. We screened more than 250 NS cases without mutation in known NS disease‐causing genes by quantitative PCR, and none of these studies produced results in the duplicated range. We also explored the possibility that de novo changes affecting the untranslated region (UTR) of the PTPN11 transcript might represent an alternative event involved in SHP2 enhanced expression. DHPLC analysis and direct sequencing of the entire 3′ UTR in 36 NS patients without mutation in known genes did not show any disease‐associated variant. These findings indicate that duplications of PTPN11 represent an uncommon cause of NS, and functionally relevant variations within the 3′UTR of the gene do not appear to play a major role in NS. However, recurrent observations of NS in individuals with duplications involving the PTPN11 locus suggest that increased dosage of SHP2 may have dysregulating effects on intracellular signaling. © 2009 Wiley‐Liss, Inc." @default.
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- W2022093232 date "2009-09-24" @default.
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- W2022093232 title "Genomic duplication of<i>PTPN11</i>is an uncommon cause of Noonan syndrome" @default.
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- W2022093232 doi "https://doi.org/10.1002/ajmg.a.32992" @default.
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