CALR-ETdb

CALR-ETdb catalogs calreticulin (CALR) gene variants associated with essential thrombocythemia (ET) and refines their classification to improve molecular interpretation of CALR mutations.

Key Features:

• Variant catalog: Compiles 155 distinct CALR variants derived from the COSMIC database and relevant scientific literature.
• Prevalence context: Records that CALR mutations occur in approximately 25% of ET patients and that type 1 and type 2 variants together account for about 85% of cases.
• Classification refinement: Analyzes variants to identify five new classes expanding the traditional type 1 and type 2 categorization, including distinctions related to type 1-like and type 2-like groupings.
• Class E identification: Identifies a fifth class, designated "E", that comprises over 10% of CALR variants and appears not to be associated with ET.
• Structural analysis: Conducts structural analyses that reveal common features among variants linked to ET to assess potential functional impacts.

Scientific Applications:

• Genetic characterization of ET: Enables detailed study of CALR mutation diversity and refined classification in essential thrombocythemia.
• Molecular mechanism investigation: Supports interpretation of structural features of ET-linked CALR variants to explore functional consequences.
• Therapeutic research support: Provides refined variant classification information to inform development of targeted therapeutic strategies for ET.

Methodology:

Variants were compiled from the COSMIC database and relevant literature, subjected to analyses to refine the CALR classification into five classes, and examined via structural analyses to identify common features among ET-associated variants.