Gene duplication

Molecular evolutionary analysis of the high-affinity K+ transporter gene family in angiosperms

P. Yang, Hua, C., Zhou, F., Zhang, B. - J., Cai, X. - N., Chen, Q. - Z., Wang, R. - L., Yang, P., Hua, C., Zhou, F., Zhang, B. - J., Cai, X. - N., Chen, Q. - Z., and Wang, R. - L., “Molecular evolutionary analysis of the high-affinity K+ transporter gene family in angiosperms”, vol. 15, p. -, 2016.

The high-affinity K+ transporter (HKT) family comprises a group of multifunctional cation transporters widely distributed in organisms ranging from Bacteria to Eukarya. In angiosperms, the HKT family consists primarily of nine types, whose evolutionary relationships are not fully understood. The available sequences from 31 plant species were used to perform a comprehensive evolutionary analysis, including an examination of selection pressure and estimating phylogenetic tree and gene duplication events.

Genome-wide identification and evolutionary analysis of nucleotide-binding site-encoding resistance genes in Lotus japonicus (Fabaceae)

H. Song, Wang, P. F., Li, T. T., Xia, H., Zhao, S. Z., Hou, L., and Zhao, C. Z., “Genome-wide identification and evolutionary analysis of nucleotide-binding site-encoding resistance genes in Lotus japonicus (Fabaceae)”, vol. 14, pp. 16024-16040, 2015.

Nucleotide-binding site (NBS) disease resistance genes play a crucial role in plant defense responses against pathogens and insect pests. Many NBS-encoding genes have been detected in Lotus japonicus, an important forage crop in many parts of the world. However, most NBS genes identified so far in L. japonicus were only partial sequences. We identified 45 full-length NBS-encoding genes in the L. japonicus genome, and analyzed gene duplications, motifs, and the molecular phylogeny to further understand the NBS gene family.

Comprehensive identification and expression analysis of Hsp90s gene family in Solanum lycopersicum

W. S. Zai, Miao, L. X., Xiong, Z. L., Zhang, H. L., Ma, Y. R., Li, Y. L., Chen, Y. B., and Ye, S. G., “Comprehensive identification and expression analysis of Hsp90s gene family in Solanum lycopersicum”, vol. 14, pp. 7811-7820, 2015.

Heat shock protein 90 (Hsp90) is a protein produced by plants in response to adverse environmental stresses. In this study, we identified and analyzed Hsp90 gene family members using a bioinformatic method based on genomic data from tomato (Solanum lycopersicum L.). The results illustrated that tomato contains at least 7 Hsp90 genes distributed on 6 chromosomes; protein lengths ranged from 267-794 amino acids. Intron numbers ranged from 2-19 in the genes.

Duplication polymorphisms in exon 4 of κ-casein gene in yak breeds/populations

S. Pingcuo, Gao, J., Jiang, Z. R., Jin, S. Y., Fu, C. Y., Liu, X., Huang, L., and Zheng, Y. C., “Duplication polymorphisms in exon 4 of κ-casein gene in yak breeds/populations”, vol. 14, pp. 10242-10248, 2015.

The objective of this study was to compare 12 bp-duplication polymorphisms in exon 4 of the κ-casein gene among 3 breeds/populations of yak (Bos grunniens). Genomic DNA was extracted from yak blood or muscle samples (N = 211) and a partial sequence of exon 4 of κ-casein gene was amplified by polymerase chain reaction. A polyacrylamide gel electrophoresis assay of the products (169 bp) revealed 2 variants. These variants differed in a 12-bp duplication of the nucleotide sequence corresponding to amino acids 147-150 (Glu-Ala-Ser-Pro) or 148-151 (Ala-Ser-Pro-Glu).

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