Comprehensive Update and Revision of Nomenclature on Complement C6 and C7 Variants
Mariam Massri1, Luisa Foco2, Reinhard Würzner3
1Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria; and.
Insights
Inconsistent nomenclature for complement C6 and C7 variants hinders research. This study proposes a unified classification system to reconcile discrepancies and advance understanding of complement gene variants.
Area of Science:
- Genetics
- Immunology
- Bioinformatics
Background:
- Complement genes, including C6 and C7, exhibit numerous variants with clinical significance.
- Over 50 years of research have led to inconsistent terminology for classifying these variants.
- Discrepancies exist between historical C6 and C7 variant classifications and current genome browser data.
Purpose of the Study:
- To address the inconsistent nomenclature of complement C6 and C7 variants.
- To identify the causes of discrepancies in C6 and C7 variant classification.
- To propose a unified classification system for complement variants.
Main Methods:
- Comparative analysis of historical and current C6 and C7 variant data.
- Identification of inconsistencies in amino acid annotation and primer modification methods.
- Development of a standardized nomenclature system.
Main Results:
- Significant discrepancies were found in the nomenclature of complement C6 and C7 variants.
- Inconsistent amino acid annotation and primer modification contribute to nomenclature issues.
- Several incorrectly classified variants were identified, highlighting the need for unification.
Conclusions:
- A unified classification system is crucial for accurate genetic information.
- The proposed nomenclature system aims to reconcile past and present data for C6 and C7 variants.
- This initiative seeks to encourage further research into complement variants and their roles.
Abstract:
Complement genes encompass a wide array of variants, giving rise to numerous protein isoforms that have often been shown to exhibit clinical significance. Given that these variants have been discovered over a span of 50 y, one challenging consequence is the inconsistency in the terminology used to classify them. This issue is prominently evident in the nomenclature used for complement C6 and C7 variants, for which we observed a great discrepancy between previously published works and variants described in current genome browsers. This report discusses the causes for the discrepancies in C6 and C7 nomenclature and seeks to establish a classification system that would unify existing and future variants. The inconsistency in the methods used to annotate amino acids and the modifications pinpointed in the C6 and C7 primers are some of the factors that contribute greatly to the discrepancy in the nomenclature. Several variants that were classified incorrectly are highlighted in this report, and we showcase first-hand how a unified classification system is important to match previous with current genetic information. Ultimately, we hope that the proposed classification system of nomenclature becomes an incentive for studies on complement variants and their physiological and/or pathological effects.
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