一个剧情扭曲:当RNA在配对DNA-RNA生殖系遗传检测中产生意想不到的发现时
Heather Zimmermann1, Terra Brannan1, Colin Young1
1Ambry Genetics, 1 Enterprise Drive, Aliso Viejo, CA 92656, USA.
Genes
|November 27, 2025
概括
影响RNA拼接的生殖系变异可能导致疾病,但解释是复杂的. 配对的DNA和RNA测试揭示了意想不到的拼接事件,改善了变体解释,并突出了RNA测试的好处.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 生物信息学是一种生物信息学.
背景情况:
- 影响RNA拼接的生殖系遗传变异是人类疾病的重要原因.
- 由于拼接机制的复杂性,解释这些变体是具有挑战性的.
- 拼接预测算法的进步提高了准确性,但预测异常拼接仍然很困难.
研究的目的:
- 为了说明解释具有不寻常拼接影响的遗传变异的复杂性.
- 为了证明配对的DNA和RNA测试如何可以避免变体解释的陷.
- 扩大对临床相关拼接机制的理解.
主要方法:
- 对患者数据的回顾性审查,同时进行DNA和RNA测试.
- 分析了七种罕见的变种,表现出不寻常的拼接影响.
- 以案例为基础的示例来突出解释挑战和解决方案.
主要成果:
- 一个共识捐赠地点的变体没有显示拼接影响 (NF1 c.888+2T>C).
- 一种中型外体变异通过一种新型的捐赠体和神秘的接受体位 (BRIP1 c.727A>G) 引起了伪内化.
- 其他变体显示了结合体切换 (LZTR1),避免了无意中介衰变 (APC,BRCA2),并涉及到皮里米丁通道优化 (NF1,ATM).
结论:
- 配对DNA和RNA测试发现了意想不到的拼接事件,改变了变体解释.
- 这些发现扩大了对临床意义上的拼接机制的知识.
- 这项研究强调了RNA测试在遗传诊断中的价值.
相关概念视频
RNA Editing
9.7K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
9.7K
piRNA - Piwi-interacting RNAs
7.5K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
7.5K
Translation
17.4K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
17.4K
Alternative RNA Splicing
24.6K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
24.6K
Nonsense-mediated mRNA Decay
11.7K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
11.7K
RNA Splicing
60.3K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
60.3K


