mortality/aging
• no homozygotes are born
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embryo
• although most homozygotes appear normal at E8.5, they exhibit growth retardation/arrest at E9.5
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cellular
• activation of mTORC1 (mammalian/mechanistic target of rapamycin complex 1) in response to amino acids is attenuated in mutant mouse embryonic fibroblasts relative to wild-type cells, as showed by a reduced level of S6K phosphorylation
• the extent of colocalization of Lamp1 and mTOR induced by stimulation with amino acids is less pronounced than in wild-type cells
• expression of HA-TMEM55B in mutant cells partially restores the amino acid-induced recruitment of mTOR to lysosomes
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