Design a Western Blot for FLG

Band shift · Use the separately labelled calculated mass and catalog-observed evidence above. A sequence annotation does not establish an observed migration shift. Verify target identity with orthogonal controls.

Isoforms · The supplied record lists one isoform and no alternative sequence. It therefore provides no annotated isoform explanation for multiple bands. Compare each band with the approximately 435 kDa full-length candidate before assigning an identity.

PTM · FLG has phosphoprotein and citrullination keywords, but the supplied record lists no modified residues or glycosylation sites. These keywords alone cannot predict a visible shift or assign an unexpected band to a modification.

Induction · No general induction response is established by this guide. A pathway or gene-set association is not evidence of induction in a particular specimen. Verify the relevant treatment and control in a target-specific experiment.

Transfer · FLG is 4,061 residues with a predicted mass of 435.2 kDa. Choose and check a transfer setup suitable for very large proteins, and confirm that protein leaves the gel and reaches the membrane. The supplied features do not specify a particular membrane or transfer method.

Blocking · Standard workflow guidance: follow the PB9870 datasheet where specified. Otherwise compare 5% milk or 5% BSA in TBST; for a phospho-specific assay start with BSA. Optimize background and specific signal with matched controls.

Quantitation · Standard workflow guidance: quantify only a validated target band within the linear exposure range. Use consistent sample preparation and loading, retain biological replicates, and avoid interpreting saturation or loading differences as regulation.

Interpretation · The supplied predicted mass is 435.2 kDa, close to the reported apparent band at approximately 435 kDa. Use that region to identify the full-length candidate; the supplied features do not establish a band shift.

FLG contains repeated sequence, so an antibody could recognize related regions within the protein. The record also notes colocalization with CAPN1, but does not establish cleavage. Treat smaller bands as unidentified until antibody specificity or independent evidence supports an assignment.

The supplied localization places FLG in keratohyalin granules of the epidermal stratum granulosum and notes it in granular keratinocytes and lower corneocytes. Use a sample containing these cell populations when assessing FLG expression.

Use the same approximately 435 kDa band for comparisons and account for differences in the abundance of granular keratinocytes or lower corneocytes between samples. The supplied localization makes cell composition relevant to interpreting band intensity.