LAMP-1Anti-Lysosome-Associated Membrane Protein-1
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Both LAMP-1 and LAMP-2 concentrations from blood spots from newborns showed characteristic skewed distributions when compared with the theoretical gaussian distribution (Fig.
LAMP-1 and LAMP-2 are structurally similar proteins; however, these proteins have been reported to be differentially regulated.
It was noted previously in the LAMP-1 assay (12) that there was an interaction of LAMP-1 with plasma proteins, which caused a slight decrease in the measured concentration of exogenous LAMP-1 that was added to plasma.
The significant correlation between the amount of LAMP-1 and LAMP-2 in blood spots from newborns and plasma from both unaffected and LSD-affected individuals demonstrates that these are not independent variables and, as such, that there would be no advantage to screening for both markers.
This has been discussed previously (12); however, it is still unknown why LAMP-1 and LAMP-2 are increased in some disorders and not others.
The distributions of both LAMP-1 and LAMP-2 in the unpartitioned newborn population were characteristically skewed towards the high concentrations; this will produce a large number of false positives arising from the primary screen.
Diagnosis of lysosomal storage disorders: evaluation of a lysosome-associated membrane protein LAMP-1 as a diagnostic marker.