7.下列何種檢查較不適宜用於單基因疾病(Single genetic disease)的分子診斷(Molecular diagnosis)?
(A)Linkage analysis
(B)array Comparative Genomic Hybridization(aCGH)
(C)DNA sequence-based analysis
(D)Fluorescence in situ hybridization(FISH)

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統計: A(190), B(79), C(129), D(322), E(0) #2866105

詳解 (共 2 筆)

#5516652
FISH無法偵測某些致病遺傳缺失,如染色...
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#6492324
問題 FISH 的限制
解析度 ,約需 >100–200 kb 以上異常才能偵測
適用對象 用於已知位點的結構變異,如染色體異位、微缺失
單基因點突變 ❌ 幾乎無法檢測,除非使用專門設計探針,且針對較大區域
適用例子 DiGeorge (22q11.2 deletion), Cri-du-chat,但不是 CFTR、BRCA 等
ㅤㅤ
補充:FISH for detecting Her2/neu mutations in breast cancer
→因為是偵測Gene amplification (extra copies of a gene),所以可以用
Target What’s abnormal Why it matters How it’s detected
HER2/neu (ERBB2 gene) Gene amplification → overexpression of HER2 protein on tumor cells Predicts response to HER2-targeted therapy (e.g., trastuzumab) ✅ FISH (gold standard), IHC (screening)
ref. Amboss GPT
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