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Adams, Elizabeth J; Khoriaty, Rami; Kiseleva, Anna; Cleuren, Audrey C A; Tomberg, Kärt; van der Ent, Martijn A; Gergics, Peter; Tang, Vi T; Zhu, Guojing; Hoenerhoff, Mark J; O'Shea, K Sue; Saunders, Thomas L; Ginsburg, David
Scientific reports, 10/2021, Letnik: 11, Številka: 1Journal Article
The COPII component SEC24 mediates the recruitment of transmembrane cargos or cargo adaptors into newly forming COPII vesicles on the ER membrane. Mammalian genomes encode four Sec24 paralogs (Sec24a-d), with two subfamilies based on sequence homology (SEC24A/B and C/D), though little is known about their comparative functions and cargo-specificities. Complete deficiency for Sec24d results in very early embryonic lethality in mice (before the 8 cell stage), with later embryonic lethality (E7.5) observed in Sec24c null mice. To test the potential overlap in function between SEC24C/D, we employed dual recombinase mediated cassette exchange to generate a Sec24c allele, in which the C-terminal 90% of SEC24C has been replaced by SEC24D coding sequence. In contrast to the embryonic lethality at E7.5 of SEC24C-deficiency, Sec24c pups survive to term, though dying shortly after birth. Sec24c pups are smaller in size, but exhibit no other obvious developmental abnormality by pathologic evaluation. These results suggest that tissue-specific and/or stage-specific expression of the Sec24c/d genes rather than differences in cargo export function explain the early embryonic requirements for SEC24C and SEC24D.
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in: SICRIS
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