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Difference Between the Development of Kidney Cells in Mice and Humans

by Dr. Trupti Shirole on March 21, 2016 at 10:11 AM
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 Difference Between the Development of Kidney Cells in Mice and Humans

Nephrons are the functional units of the kidneys. Compared to a mouse, a human has nearly 100 times more nephrons. Humans may owe these abundant nephrons to a gene called SIX1, revealed a new paper published in the journal Development.

In the paper, USC Stem Cell researcher Lori O'Brien from the laboratory of Andy McMahon and her colleagues noticed that while Six1 plays a fleeting and early role in mouse kidney development, it may have a more substantial role in human kidney development.

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In the developing mouse, where around 13,000 nephrons are generated over a two-week span, Six1 ceases its activity by the time the kidney has grown its first branches - right at the beginning of the two weeks.

In the developing human, where around one million nephrons are formed over a 30-week period, SIX1 remains present well beyond the initial round of branching.
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Now that the researchers have proven that SIX1 lingers in the developing human kidney, the next step will be to determine what exactly it's doing there. The researchers suspect that SIX1 is helping expand the population of progenitor cells that give rise to nephrons, but they still need to do further experiments to confirm their hypothesis.

By learning more about this process, the researchers hope to better understand both normal development and a type of pediatric kidney cancer, called Wilms' tumor, which is associated with SIX1 mutations.

"The results of this study have highlighted the importance of examining human development, and continuing to question what knowledge we have gained from models such as the mouse," said O'Brien. "We may find significant differences, such as in the case of SIX1, that have meaningful effects on both development and disease and will be important for driving regenerative strategies."

Source: Eurekalert
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