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Analysis of synonymous codon usage patterns of HPRT1 gene across twelve mammalian species.
Genomics 2019 Februrary 26
Genetic changes in Hypoxanthine guanine phosphoribosyltransferace (HPRT1) gene can alter the expression of the dopamine neurotransmitter leads to abnormal neuron function, a disease called Lesch-Nyhan syndrome (LNS). Although different studies were conducted on LNS, information on codon usage bias (CUB) of HPRT1 gene is limited. The present study examines the genetic determinants of CUB in HPRT1 gene using twelve mammalian species. In the coding sequence of HPRT1 genes, A/T ending codons was most frequently used. A higher ENC value was observed indicating lower HPRT1 gene expression in the selected mammalian species. Correlation analysis indicates that compositional constraints under mutation pressure can involve in CUB of HPRT1 genes among the selected mammalian species. Relative synonymous codon usage (RSCU) value revealed that the codons such as ACT, AGG, ATT and AGC were over-represented in each of the mammalian species. Result from the analysis of the RSCU indicates that compositional constraint is a key driver for the variation in codon usage. Ratio of nonsynonymous (dN) and synonymous (dS) substitution further suggested that purifying selection occurs among the HPRT1 gene of studied mammals to maintain its protein function under the process of evolution. Our findings report an insight into the codon usage patterns of HPRT1 gene and will be useful for LNS management.
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