Several of the antigens in this group exist as families or as modified forms, so the clone rather than the catalogue name decides what a result means: an isoform, a phosphorylated or glycosylated species, or a viral protein at a particular stage. Each heading here names the distinction the datasheet has to make before the reagent is ordered.
A myh7 antibody and the isoform switch it reports
MYH7 encodes the slow or beta cardiac myosin heavy chain, and the shift between it and the fast isoforms is the readout in cardiac hypertrophy and in fibre typing, so a myh7 antibody has to be specific against the other family members for the claim to hold. The protein is very large, which makes a low percentage gel and a long transfer the difference between a band and nothing.
An o-glcnac antibody and a modification rather than a protein
An o-glcnac antibody recognises a single sugar added to serine and threonine across many proteins, so it reports a global modification state rather than a site and is used for screening and enrichment. The modification is labile and is removed by the enzyme during lysis, so an inhibitor in the buffer is required, and a treatment that raises it is the positive control.
An xiap antibody and an inhibitor read against its substrates
XIAP blocks caspases and is itself degraded during apoptosis, so an xiap antibody reports a level that falls in the condition being studied, and a cleaved caspase on the same membrane is what makes that fall meaningful. It is also targeted by mimetic drugs, so a treated lane is the functional control, and the family relatives share domains.
An egr2 antibody and an immediate early factor
EGR2 is induced within an hour of stimulation and then falls, so an egr2 antibody reports a moment and a resting sample shows little, which is the expected result. It is also a myelination factor in Schwann cells, so the tissue decides the interpretation. The family shares zinc finger sequence, so specificity against EGR1 belongs in the datasheet.
An nr4a1 antibody and another induced nuclear receptor
NR4A1 is an immediate early nuclear receptor with no classical ligand, so an nr4a1 antibody reports induction rather than a constitutive level and it moves between nucleus and mitochondria, which means location is part of the finding. A short time course after stimulation is the only comparable sample, and the family relatives are close enough to need specificity data.
An hcn4 antibody and a pacemaker channel
HCN4 carries the pacemaker current in the sinoatrial node and in some neurons, so an hcn4 antibody is read in a tissue where the expected pattern is itself the control. It is a large multipass channel, so gentle lysis, no boiling and a membrane preparation apply, and the family members are conserved enough that a clone's specificity within them has to be stated.
An irf4 antibody and a lineage factor in pathology
IRF4 is used to call lymphoid lineages and is scored as nuclear positivity with a validated clone, so an irf4 antibody is chosen for the application and the scoring rule rather than for affinity. The interferon regulatory family shares a domain, so specificity matters, and expression in plasma cells is high enough that they serve as an internal positive control.
An ebv antibody and two different measurements
An ebv antibody is either a reagent against a viral protein, used to detect infected cells and to type an expression programme, or a patient's own antibody measured as evidence of past or recent infection. The two are unrelated purchases. For the reagent, which viral protein and which latency programme it belongs to is what decides whether a stain answers the question.
Questions people ask about myosin heavy chain antibody
Why does an isoform clone matter so much in muscle?
The switch between isoforms IS the readout, so a clone that reports the family reports nothing about the switch.
Why does an O-GlcNAc signal disappear?
The modification is removed enzymatically during lysis. An inhibitor in the buffer is required.
Viral protein or patient antibody?
They are different products. Name the viral protein for a reagent, or the immunoglobulin class for a serology test.