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AKAP12

Basics

Aliases:
This biomarker is also known as:
  • Myasthenia gravis autoantigen,
  • AKAP250,
  • Gravin,
  • A-kinase anchor protein 250 kDa,
  • A-kinase anchor protein 12,

Description…

AKAP12 is a member of the A-kinase anchor protein (AKAP) family, a group of structurally diverse proteins which have the common function of binding to the regulatory subunit of protein kinase A (PKA) and confining the holoenzyme to discrete locations within the cell. AKAP12 is expressed in endothelial cells, cultured fibroblasts, and osteosarcoma cells. It associates with protein kinases A and C and phosphatase, and serves as a scaffold protein in signal transduction. This protein and RII PKA colocalize at the cell periphery. AKAP12 is a cell growth-related protein. Antibodies to this protein can be produced by patients with myasthenia gravis. Alternative splicing of this gene results in two transcript variants encoding different isoforms.

Attributes

QA State: Accepted
Type: Genomic
Short Name:

Organs

The following organs have data associated with this biomarker…

Esophagus

Attributes

Phase: Two
QA State: Accepted

Overview

Esophageal adenocarcinoma risk in Barrett's esophagus is increased 30- to 125- fold versus the general population. Among all Barrett's esophagus patients neoplastic progression occurs only once per 200 patient-years. Molecular markers (individual or in panel) would be useful to risk-stratify patients for more efficient surveillance endoscopy and to improve the early detection of progression.

Performance Comment

Promoter hypermethylation of AKAP12 occurs early during Barrett's-associated esophageal neoplastic progression. Studies investigating potential use of this protein as a biomarker are ongoing.

Supporting Study Data

The following studies/protocols provide evidence supporting AKAP12 indications for the Esophagus…

Barrett's Esophagus Methylation Profiles

We propose a nested case-control study of biomarkers in the setting of BE. By bringing together research institutions with large populations of patients with BE, we will perform a multi-center study of FISH and hypermethylation markers as possible prognostic factors in BE. The centers will select from their cohorts who have progressed to HGD or to adenocarcinoma of the esophagus ("progressors"), and who also donated samples prior to the development of cancer, when their histology was felt to be benign. These subjects will be compared to individuals who have been under endoscopic surveillance, but who have not progressed to HGD or EAC ("non-progressors"). Using this approach, we hope to identify promising markers for risk stratification in BE. We expect to be able to make successful application for a prospective study of markers identified in this case-control study.

View more about this study
Biomarker Characteristics Summary
Notes Sensitivity Specificity Prevalence NPV PPV Specific Assay Type
Assessment of the classification accuracy of a single marker using ROC curve analyses show AUC for HPP1, p16, and RUNX3 are all significantly greater than 0.50. For AKAP12, AUC (95% confidence interval) was 0.561 (0.451, 0.672). 0.0 0.0 0.0
Decision Rule

PMID:18199717

Additional Study-Specific Protocols
Study-Specific Publications
Study-Specific Resources

Organ-Specific Protocols

No organ-specific protocols defined.

Organ-Specific Publications

No organ-specific publications defined.

Organ-Specific Resources

No organ-specific resources defined.

Studies

No associated studies or protocols found.

Publications

Resources

Announcement