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DNA methyltransferase 2 ( DNMT2 ) was renamed as tRNA aspartic acid methyltransferase 1 ( TRDMT1 ) by catalyzing the methylation of tRNA Asp  anti-codon loop C38. The development of sequencing of nucleic acids and protein detection techniques have prompted the demonstration that  TRDMT1  mediated tRNA modification affects protein synthesis efficiency. This process affects the growth and development of animals. The DNA of 224 Qinchuan cattles aged 2–4 years old was collected in this experiment. The genetic variations of  TRDMT1  exon and some intron regions were detected by mixed pool sequencing technology. qRT-PCR and Western Blot were used to detect the expression levels of mRNA and protein produced with the combination of different genetic variant loci. Three haplotypes were detected and the distribution ratios were different. Muscle tissue mRNA and protein testing showed that there were differences in mRNA expression levels among different genotypes ( P  &lt; 0.05) and the protein expression levels between different genotypes show the same trend as mRNA. This study provides potential molecular materials for the improvement of Qinchuan cattle reproductivity and provides theoretical support for studying the effects of livestock  TRDMT1  on animal growth and development.

Expression of different genotypes of bovine TRDMT1 gene and its polymorphisms association with body measures in Qinchuan cattle (Bos Taurus)