О р и г и н а л ь н ы е и с с л е д о в а н и я Использование комбинации цитогенетических факторов риска и молекулярно-генетических показателей, выявляемых методом множественной лигазно-зависимой амплификации зондов, для прогнозирования исходов лечения острого лимфобластного лейкоза из B-линейных предшественников у детей не дает существенных преимуществ по сравнению с изолированной оценкой делеций в гене IKZF1
MLL is involved in fusion genes with more than 100 partner genes, approximately 80 of which have been characterized at the molecular level. MLL fusion genes are often found in infants (60-80% of acute lymphoblastic leukemia (ALL) cases and 40-50% of acute myeloblastic leukemia (AML) cases) and are appreciably rarer (8-10%) in children older than 1 year of age. MLL rearrangements are important markers in diagnosis and treatment choice. To identify the partner gene is of primary importance for prognosis and minimal residual disease monitoring. The structure of the fusion gene, including localization of the MLL breakpoints, is also informative. A method was developed to examine the fusion transcripts in order to identify the partner gene among the six most common ones and to establish the exon structure of the rearranged MLL. The method includes a multiplex reverse transcriptase-polymerase chain reaction (RT-PCR) to amplify and to fluorescently label a fusion transcript fragment and subsequent hybridization of the product on a biological microchip with immobilized oligonucleotides complementary to exons of MLL and its partner genes AFF1, MLLT1, MLLT3, MLLT4, MLLT10, and ELL. Hybridization results were verified by sequencing the RT-PCR products and, in some cases, performing long-distance inverse PCR (LDI-PCR). The study involved 38 bone marrow samples from ALL patients (including 33 children younger than 1 year of age) and 15 samples from AML patients (including 10 from children younger than 1 year of age). The main partner genes were AFF1 (49%), MLLT1 (27%), MLLT3 (12%), and MLLT10 (12%) in ALL and MLLT3 (80%), MLLT10 (10%), and MLLT4 (10%) in AML. Fusion gene transcripts most commonly included MLL exon 11 (58% of ALL cases and 50% of AML cases), suggesting a breakpoint in MLL intron 11.
frequency of visits to the ?static? pages were as follows: news items (27%), pharmacologic treatment (21%), diagnostic/therapeutic guidelines (21%), event broadcasts (12%), disease-specific education (10%), and nonpharmacologic management (8%). Highlights of the ACR meetings were one of the most heavily accessed ?news item? postings on the Site. For the interactive forums, treatment related postings constituted the majority of postings: 55% of questions in ?Ask the Expert?, and 70% of postings to the Message Board. ?Hits? to the Site, and time spent on the Site, have increased steadily since launch, currently totalling 1,200,000 hits and 12 min per month, respectively. Conclusion The versatility of the Internet confers the unique ability to constantly update educational data bases. The desire for updated information is reflected on this Arthritis Web Site by the high frequency of visits to treatment and news related pages. Credible educational websites can effectively complement traditional on-site educational forums.
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