Abstract
Simple sequence repeats (SSRs) are hypermutable, and this instability leads to many disorders. Perhaps it is because of this reason SSRs are relatively rare in coding sequences. The present study was undertaken to explore SSRs in 5′ and 3′ flanking sequences (FS) of cell cycle genes (checkpoint; regulation; replication, repair, and recombination (RRR); and transition) in humans and eight mammalian orthologues. The present study shows more SSRs in FS of regulation genes compared to other gene groups. However, differences in repeat numbers between different groups of cell cycle genes are not significant. Trinucleotide repeats are generally more in 3′ FS of human cell cycle genes but not in other mammals (with some exceptions). On the other hand, in 5′ FS of cell cycle genes (except human genes), trinucleotide repeats are more in number compared to other repeat types in almost all mammals (with some exceptions). Repeat numbers do not differ significantly from other mammals except human and cow genes. Many repeats in FS of human genes are conserved, including rare repeats like CG/GC. CG motifs are conserved only in 5′ and 3′ FS of regulation genes but GC motifs are conserved in RRR genes. This paper presents characteristics of SSRs occurring in 5′ and 3′ FS of cell cycle genes, which may be potential mutational hotspots that could be used for further exploration of their potential roles in gene regulation or medical investigations.
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Abbreviations
- Di:
-
Dinucleotide
- FS:
-
Flanking sequence(s)
- Penta:
-
Penta-nucleotide
- SSRs:
-
Simple sequence repeats
- Tetra:
-
Tetranucleotide
- Tri:
-
Trinucleotide
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Acknowledgments
I am grateful to Mr. Abhay Pendse for help with computational work. I am indebted to Ensembl workgroup especially Dr. Javier Herrero (Ensembl Compara Project Leader, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge, UK) for their help in obtaining multiple aligned sequences. Further, I am obliged to all open-source journals, databases, and scientists who provided reprints and information related to this work.
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Trivedi, S. (2014). Simple Sequence Repeats in 5′ and 3′ Flanking Sequences of Cell Cycle Genes. In: R. Sudhakaran, P. (eds) Perspectives in Cancer Prevention-Translational Cancer Research. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1533-2_7
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DOI: https://doi.org/10.1007/978-81-322-1533-2_7
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