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Kidney Int
2023 Jan 01;1031:77-86. doi: 10.1016/j.kint.2022.07.027.
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A comparative study of cellular diversity between the Xenopus pronephric and mouse metanephric nephron.
Corkins ME
,
Achieng M
,
DeLay BD
,
Krneta-Stankic V
,
Cain MP
,
Walker BL
,
Chen J
,
Lindström NO
,
Miller RK
.
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The kidney is an essential organ that ensures bodily fluid homeostasis and removes soluble waste products from the organism. Nephrons, the functional units of the kidney, comprise a blood filter, the glomerulus or glomus, and an epithelial tubule that processes the filtrate from the blood or coelom and selectively reabsorbs solutes, such as sugars, proteins, ions, and water, leaving waste products to be eliminated in the urine. Genes coding for transporters are segmentally expressed, enabling the nephron to sequentially process the filtrate. The Xenopus embryonic kidney, the pronephros, which consists of a single large nephron, has served as a valuable model to identify genes involved in nephron formation and patterning. Therefore, the developmental patterning program that generates these segments is of great interest. Prior work has defined the gene expression profiles of Xenopus nephron segments via in situ hybridization strategies, but a comprehensive understanding of the cellular makeup of the pronephric kidney remains incomplete. Here, we carried out single-cell mRNA sequencing of the functional Xenopus pronephric nephron and evaluated its cellular composition through comparative analyses with previous Xenopus studies and single-cell mRNA sequencing of the adult mouse kidney. This study reconstructs the cellular makeup of the pronephric kidney and identifies conserved cells, segments, and associated gene expression profiles. Thus, our data highlight significant conservation in podocytes, proximal and distal tubule cells, and divergence in cellular composition underlying the capacity of each nephron to remove wastes in the form of urine, while emphasizing the Xenopus pronephros as a model for physiology and disease.
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Based on an image from Corkins et al. Kidney Int. January 1, 2023; 103 (1): 77-86. Regions with an "X" label are parts of the pronephric nephron, expect for x0, which is the nephrocoel.
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