ClinVar Miner

Submissions for variant NM_000517.6(HBA2):c.420del (p.Lys140fs)

dbSNP: rs63750520
Minimum review status: Collection method:
Minimum conflict level:
ClinVar version:
Total submissions: 4
Download table as spreadsheet
Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Quest Diagnostics Nichols Institute San Juan Capistrano RCV000507225 SCV000601216 pathogenic not provided 2016-12-20 criteria provided, single submitter clinical testing
ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories RCV000507225 SCV001160167 uncertain significance not provided 2023-11-01 criteria provided, single submitter clinical testing The HBA2 c.420del; p.Lys140AsnfsTer9 variant (Hb Wayne, also known as Lys139fs when numbered from the mature protein; rs63750520; HbVar ID: 702) has been reported in individuals with no clinical abnormalities (Salkie 1992, Seid-Akhavan 1976, HbVar database); however, its phenotype in the presence of other pathogenic globin variants is uncertain. The variant hemoglobin comprises 4-6% (Seid-Akhavan 1976) or 12-16% of total hemoglobin (Huisman 1984), depending on the purification methodology. Functional characterization of the variant hemoglobin indicates increased oxygen affinity and strong reduction in Bohr effect (Huisman 1984). The variant is listed in ClinVar (Variation ID: 15629) and is only observed on one allele in the Genome Aggregation Database, indicating it is not a common polymorphism. The variant causes a frameshift that replaces the last three amino acids with eight novel amino acids at the C terminus. Although the variant causes protein translation past the canonical termination codon, it is not predicted to impact the downstream polyadenylation site (PolyA signal miner). Due to the limited information regarding this variant, its clinical significance cannot be determined with certainty. References: Link to HbVar database: https://globin.bx.psu.edu/hbvar/menu.html Huisman T et al. Hb Wayne, the frameshift variant with extended alpha chains observed in a Caucasian family from Alabama. Hemoglobin. 1984; 8(1):1-15. PMID: 6327575. Salkie M et al. A Canadian family with Hb Wayne; characterization by HPLC and DNA sequencing. Hemoglobin. 1992; 16(6):515-9. PMID: 1487423. Seid-Akhavan M et al. Hemoglobin Wayne: a frameshift mutation detected in human hemoglobin alpha chains. Proc Natl Acad Sci U S A. 1976; 73(3):882-6. PMID: 1062801.
OMIM RCV000016896 SCV000037167 other HEMOGLOBIN WAYNE 2022-09-12 no assertion criteria provided literature only
Natera, Inc. RCV001831574 SCV002093850 uncertain significance alpha Thalassemia 2021-02-09 no assertion criteria provided clinical testing

The information on this website is not intended for direct diagnostic use or medical decision-making without review by a genetics professional. Individuals should not change their health behavior solely on the basis of information contained on this website. Neither the University of Utah nor the National Institutes of Health independently verfies the submitted information. If you have questions about the information contained on this website, please see a health care professional.