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2004 ; 101
(9
): 2894-9
Nephropedia Template TP
gab.com Text
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English Wikipedia
Disruption of TRPM6/TRPM7 complex formation by a mutation in the TRPM6 gene
causes hypomagnesemia with secondary hypocalcemia
#MMPMID14976260
Chubanov V
; Waldegger S
; Mederos y Schnitzler M
; Vitzthum H
; Sassen MC
; Seyberth HW
; Konrad M
; Gudermann T
Proc Natl Acad Sci U S A
2004[Mar]; 101
(9
): 2894-9
PMID14976260
show ga
Impaired magnesium reabsorption in patients with TRPM6 gene mutations stresses an
important role of TRPM6 (melastatin-related TRP cation channel) in epithelial
magnesium transport. While attempting to isolate full-length TRPM6, we found that
the human TRPM6 gene encodes multiple mRNA isoforms. Full-length TRPM6 variants
failed to form functional channel complexes because they were retained
intracellularly on heterologous expression in HEK 293 cells and Xenopus oocytes.
However, TRPM6 specifically interacted with its closest homolog, the
Mg(2+)-permeable cation channel TRPM7, resulting in the assembly of functional
TRPM6/TRPM7 complexes at the cell surface. The naturally occurring S141L TRPM6
missense mutation abrogated the oligomeric assembly of TRPM6, thus providing a
cell biological explanation for the human disease. Together, our data suggest an
important contribution of TRPM6/TRPM7 heterooligomerization for the biological
role of TRPM6 in epithelial magnesium absorption.