在一个不平衡的转位中,一个神秘的微删除del{12}{p11.21}{p11.23} t{7}{12}{q21.13}{q23.1) 涉及智力障碍和卡尔曼综合征的新候选位点
Afif Ben-Mahmoud1, Shotaro Kishikawa2, Vijay Gupta1
1Neurological Disorders Research Center, Qatar Biomedical Research Institute, Hamad Bin Khalifa University, Doha, Qatar.
Scientific reports
|August 10, 2023
概括
染色体12p11.21-12p11.23上的一种新型缺失与卡尔曼综合征 (KS) 和智力障碍 (ID) 有关. 这一发现表明,这种删除中的特定基因可能会导致这些复杂的神经和发育障碍.
科学领域:
- 遗传学 是一个遗传学.
- 发育生物学 发展生物学
- 神经科学是一个神经科学.
背景情况:
- 卡尔曼综合征 (KS) 是一种遗传性疾病,其特征是低性性性性性性性性性性性性性性性性性性.
- 智力障碍 (ID) 是一种影响认知功能的神经发育障碍.
- 染色体异常,如转位和删除,可以导致复杂的遗传综合征.
研究的目的:
- 为了研究一个具有t(7;12) 转位的患者的联合KS和ID的遗传基础.
- 通过分析在12p11.21-12p11.23.23处的删除来确定负责KS和/或ID的新型候选基因.
- 探索与这些条件相关的12p11.21-12p11.23区域的副本数变异 (CNVs) 的作用.
主要方法:
- 阵列比较基因组杂交 (aCGH) 来检测隐秘的删除.
- 在KS患者的转位突破点上选候选基因.
- 在12p11.21-12p11.23区域和DECIPHER数据库案例中分析了小 CNV 的患者.
- 表型-基因型比较,对动物模型的审查,以及报告的变异和相互作用基因的分析.
主要成果:
- 在12p11.21-12p11.23发现了一个神秘的4.7 Mb删除在KS和ID的患者.
- 在转位断点的候选基因中没有发现突变.
- 几个候选基因 (例如,TSPAN11,TM7SF3,STK38L) 在与KS和/或ID表型相关的12p11.21-12p11.23删除区域中被确定.
- 候选基因在相关人体组织中的高表达支持它们的潜在作用.
结论:
- 在12p11.21-12p11.23发现的删除,而不是转位,很可能是联合KS和ID表型的原因.
- 在这种删除中,基因的剂量改变可能会导致性和认知障碍.
- 需要进一步的下一代测序研究来确认这些候选基因的因果作用.
相关概念视频
Karyotyping
61.8K
Overview
61.8K
Genomic Imprinting and Inheritance
34.7K
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
34.7K
Non-LTR Retrotransposons
11.6K
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
11.6K
Meiosis I
193.8K
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
193.8K
Intellectual Disability
117
Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
117
Exon Recombination
3.6K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.6K


