alexa Mixed Inbred FVB;B6 Background Strain Attenuates Kidney Disease and Improves Survival of Gnem712t/M712T Mice | Abstract
ISSN: 2168-9547

Molecular Biology: Open Access
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Research Article Open Access

Abstract

Recessive form of Hereditary Inclusion Body Myopathy (HIBM, IBM2, MIM:600737) is an adult onset muscle wasting disorders caused by hypomorphic GNE, the rate-limiting enzyme of sialic acid (Sia) biosynthesis. Unlike human patients, mice bearing the GneM712T/M712T genotype in C57BL/6 background strain suffer severe glomerular hematuria, incomplete podocyte development, and do not survive beyond the first few days of life. We crossed heterozygous mice (GneM712T/+) of B6 strain with FVB strain mice. In mixed inbred FVB;B6 background, the homozygous mice show attenuated glomerular disease and survive longer (mean survival 22±13 weeks, n=26). Paradoxically, the homozygous mice showed increased total Sia levels in serum (2x control), and Neu5Ac:Neu5Gc ratios are slightly shifted towards Neu5Ac in serum and towards Neu5Gc in muscle tissue. Increase in serum Sia levels may be caused by altered glomerular filtration. This paradoxical increase in serum Sia may contribute to Sia pools of muscle, and exert a potential beneficial effect. In summary, the background strain of mouse model can significantly affect the disease phenotype.

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Author(s): Yadira Valles-Ayoub, Arman Haghighatgoo, Chai Saechao, Zeshan Khokher, Christopher Creencia, Oscar Scremin, Gregory Lawson, DVM, Babak Darvish and Daniel Darvish

Keywords

Muscular dystrophy, Nonaka, Distal myopathy with rimmed vacuoles (DMRV), Sialylation, Glycosylation, Immunotherapy for Kidney Failure

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