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Viruses 2013, 5(3), 792-805; doi:10.3390/v5030792
Article

Mutation Distribution in the NSP4 Protein in Rotaviruses Isolated from Mexican Children with Moderate to Severe Gastroenteritis

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Received: 13 February 2013; in revised form: 4 March 2013 / Accepted: 5 March 2013 / Published: 11 March 2013
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Abstract: The NSP4 protein is a multifunctional protein that plays a role in the morphogenesis and pathogenesis of the rotavirus. Although NSP4 is considered an enterotoxin, the relationship between gastroenteritis severity and amino acid variations in NSP4 of the human rotavirus remains unclear. In this study, we analyzed the sequence diversity of NSP4 and the severity of gastroenteritis of children with moderate to severe gastroenteritis. The rotavirus-infected children were hospitalized before the rotavirus vaccine program in Mexico. All children had diarrhea within 1-4 days, 44 (88%) were vomiting and 35 (70%) had fevers. The severity analysis showed that 13 (26%) cases had mild gastroenteritis, 23 (46%) moderate gastroenteritis and 14 (28%) severe. NSP4 phylogenetic analysis showed three clusters within the genotype E1. Sequence analysis revealed similar mutations inside each cluster, and an uncommon variation in residue 144 was found in five of the Mexican NSP4 sequences. Most of the amino acid variations were located in the VP4 and VP6 binding site domains, with no relationship to different grades of gastroenteritis. This finding indicates that severe gastroenteritis caused by the rotavirus appears to be related to diverse viral or cellular factors instead of NSP4 activity as a unique pathogenic factor.
Keywords: rotavirus; severe gastroenteritis; NSP4 rotavirus; severe gastroenteritis; NSP4
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

González-Ochoa, G.; Menchaca, G.E.; Hernández, C.E.; Rodríguez, C.; Tamez, R.S.; Contreras, J.F. Mutation Distribution in the NSP4 Protein in Rotaviruses Isolated from Mexican Children with Moderate to Severe Gastroenteritis. Viruses 2013, 5, 792-805.

AMA Style

González-Ochoa G, Menchaca GE, Hernández CE, Rodríguez C, Tamez RS, Contreras JF. Mutation Distribution in the NSP4 Protein in Rotaviruses Isolated from Mexican Children with Moderate to Severe Gastroenteritis. Viruses. 2013; 5(3):792-805.

Chicago/Turabian Style

González-Ochoa, Guadalupe; Menchaca, Griselda E.; Hernández, Carlos E.; Rodríguez, Cristina; Tamez, Reyes S.; Contreras, Juan F. 2013. "Mutation Distribution in the NSP4 Protein in Rotaviruses Isolated from Mexican Children with Moderate to Severe Gastroenteritis." Viruses 5, no. 3: 792-805.



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