Phân tích FISH các khối u huyết học với sự tái sắp xếp 1p36 cho phép định nghĩa một cụm 2.5 Mb nằm trong vùng tối thiểu bị xóa trong hội chứng xóa 1p36

Springer Science and Business Media LLC - Tập 116 - Trang 476-485 - 2005
Idoya Lahortiga1, Iria Vázquez1,2, Elena Belloni3,4, José P. Román2, Patrizia Gasparini3,4, Francisco J. Novo2, Isabel Zudaire1, Pier G. Pelicci3,4,5, Jesús M. Hernández6, María J. Calasanz2, María D. Odero1,2
1Laboratory of Genetics, Division of Oncology, Center for Applied Medical Research (CIMA), University of Navarra, Pamplona, Spain
2Department of Genetics, School of Science, University of Navarra, Pamplona, Spain
3IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Milan, Italy
4Instituto Europeo di Oncologia, Milan, Italy
5Dipartimento di Medicina, Chirurgia ed Odontoiatria, Universita’ degli Studi di Milano, Milan, Italy
6Department of Hematology, Hospital Universitario& Centro de Investigación del Cáncer, University of Salamanca-CSIC, Salamanca, Spain

Tóm tắt

Các sự thay đổi trong vùng xa của cánh ngắn nhiễm sắc thể 1 là những bất thường tái phát trong một phổ rộng các khối u người. Tuy nhiên, vị trí của các điểm đứt gãy (BP) trên 1p36 cũng như các gen ứng cử chưa được xác định đầy đủ. Chúng tôi đã phân tích, bằng phương pháp lai huỳnh quang tại chỗ (FISH), các BP ở 26 bệnh nhân có khối u huyết học và sự tái sắp xếp 1p36 trong kiểu hình karyotype G-banding. FISH cho phép xác định chính xác hơn tất cả các mẫu đã phân tích. Chín trường hợp (35%) cho thấy các chuyển đoạn tương hỗ, 15 (58%) thay đổi không cân bằng, và hai (7%) phát hiện mất đoạn. Chúng tôi mô tả hai bất thường tái phát mới. Trong 18 trong số 26 trường hợp được phân tích, các BP được định vị trong băng 1p36, có chiều dài 25.5 Mb. Trong 14 trong 18 trường hợp này (78%) và không phân biệt giữa các khối u tủy và bạch cầu, các BP tập trung trong một vùng 2.5 Mb nằm giữa 1p36.32 và telomere. Điều thú vị là vùng này nằm trong cụm 10.5 Mb ở 1p36.22-1pter được xác định trong các trường hợp có hội chứng xóa 1p36. Vùng 2.5 Mb, nằm ở 1p36.32-1pter, có tần suất xuất hiện cao hơn của các lặp lại liên tiếp và sao chép đoạn lớn hơn 1 kb so với 25.5 Mb của toàn bộ băng 1p36. Điều này có thể giải thích cho sự dễ bị tổn thương của nó trong các tái sắp xếp nhiễm sắc thể ở các khối u huyết học.

Từ khóa

#1p36 rearrangements #hematological neoplasias #fluorescence in situ hybridization #chromosomal breakpoints #genetic aberrations

Tài liệu tham khảo

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