Jun 9, 2016

Tandem duplication events in the expansion of the small heat shock protein gene family in Solanum lycopersicum (cv. Heinz 1706)

BioRxiv : the Preprint Server for Biology
Flavia J KrsticevicElizabeth Tapia


In plants, fruit maturation and oxidative stress can induce small heat shock protein (sHSP) synthesis to maintain cellular homeostasis. Although the tomato reference genome was published in 2012, the actual number and functionality of sHSP genes remain unknown. Using a transcriptomic (RNA-seq) and evolutionary genomic approach, putative sHSP genes in the Solanum lycopersicum (cv. Heinz 1706) genome are investigated. A sHSP gene family of 33 members is established. Remarkably, roughly half of the members of this family can be explained by nine independent tandem duplication events that evolutionarily determined their functional fates. Within a mitochondrial class subfamily, only one duplicated member, Solyc08g078700, retained its ancestral chaperone function, while the others, Solyc08g078710 and Solyc08g078720, likely degenerated under neutrality and lack ancestral chaperone function. Functional conservation occurred within a cytosolic class I subfamily, whose four members, Solyc06g076570, Solyc06g076560, Solyc06g076540 and Solyc06g076520, support ~57% of the total sHSP RNAm in the red ripe fruit. Sub-functionalization occurred within a new subfamily, whose two members, Solyc04g082720 and Solyc04g082740, show heterogeneous diffe...Continue Reading

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Mentioned in this Paper

HSPB1 gene
Heat shock proteins
Small heat shock protein, Pyrococcus furiosus
MRNA Maturation
Abnormal Degeneration
Cellular Homeostasis
Class 1
Genomic Stability

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