Department of Cardiology, Affiliated Hospital of Nantong University, Nantong 226001, China.
Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN 38163, USA.
Int J Mol Sci. 2023 Aug 14;24(16):12759. doi: 10.3390/ijms241612759.
Troponin-I interacting kinase encoded by the gene is expressed in nuclei and Z-discs of cardiomyocytes. Mutations in were identified in patients with cardiac conduction diseases, arrhythmias, and cardiomyopathy.
We performed cardiac gene expression, whole genome sequencing (WGS), and cardiac function analysis in 40 strains of BXD recombinant inbred mice derived from C57BL/6J (B6) and DBA/2J (D2) strains. Expression quantitative trait loci (eQTLs) mapping and gene enrichment analysis was performed, followed by validation of candidate -regulatory genes.
WGS identified compound splicing and missense T659I variants in the D2 parent and some BXD strains (D allele) and these strains had significantly lower expression than those carrying wild-type (B allele). Expression levels of significantly correlated with multiple cardiac (heart rate, wall thickness, PR duration, and T amplitude) and metabolic (glucose levels and insulin resistance) phenotypes in BXDs. A significant -eQTL on chromosome 3 was identified for the regulation of expression. Furthermore, -correlated genes were primarily involved in cardiac and glucose metabolism-related functions and pathways. Genes , , , , , , , , , , , and were differentially expressed between the B and D alleles.
Compound splicing and T659I variants reduce cardiac expression and levels are associated with cardiac and glucose metabolism-related phenotypes.
基因编码的肌钙蛋白 I 相互作用激酶在心肌细胞的核和 Z 盘表达。在患有心脏传导疾病、心律失常和心肌病的患者中发现了基因突变。
我们对来自 C57BL/6J(B6)和 DBA/2J(D2)品系的 40 个 BXD 重组近交系小鼠进行了心脏基因表达、全基因组测序(WGS)和心脏功能分析。进行了表达数量性状基因座(eQTL)图谱和基因富集分析,随后对候选 - 调节基因进行了验证。
WGS 在 D2 亲本和一些 BXD 株系(D 等位基因)中鉴定出复合剪接和错义 T659I 变异,这些株系的表达水平明显低于携带野生型(B 等位基因)的。在 BXDs 中,的表达水平与多个心脏(心率、壁厚度、PR 间期和 T 波幅度)和代谢(血糖水平和胰岛素抵抗)表型显著相关。在 3 号染色体上确定了一个显著的 -eQTL,用于调节的表达。此外,-相关基因主要参与心脏和葡萄糖代谢相关功能和途径。基因、、、、、、、、、和在 B 和 D 等位基因之间表达差异。
复合剪接和 T659I 变异降低了心脏的表达,水平与心脏和葡萄糖代谢相关表型相关。