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Luu HS, McCavit TL, Park JY, Mitui M, Lopez DD, Timmons CF. Hb Alcorn County: A β-Globin Variant [β40(C6)Arg→Thr; HBB: c.122G>C (p.Arg41Thr)] with Increased Oxygen Affinity. Hemoglobin 2019; 43:204-206. [PMID: 31397596 DOI: 10.1080/03630269.2019.1649279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We describe Hb Alcorn County, a heterozygous hemoglobin (Hb) variant, in a 6-month-old Hispanic male and his mother. DNA sequencing demonstrated a mutation on the HBB gene [β40(C6)Arg→Thr; HBB: c.122G>C (p.Arg41Thr)], predictive of a substitution of arginine to threonine at position 40 of the β-globin protein. This amino acid substitution involves the α1β2 contact and occurs at the same position as Hb Austin [β40(C6)Arg→Ser; HBB: c.[123G>C or 123G>T] (p.Arg41Ser)] and Hb Athens-GA [β40(C6)Arg→Lys; HBB: c.122G>A (p.Arg41Lys)], both of which show increased oxygen affinity.
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Affiliation(s)
- Hung S Luu
- Department of Pathology, University of Texas Southwestern Medical Center , Dallas , TX , USA.,Department of Pathology, Children's Health , Dallas , TX , USA
| | - Timothy L McCavit
- Hematology and Oncology Center, Cook Children's Health Care System , Fort Worth , TX , USA
| | - Jason Y Park
- Department of Pathology, University of Texas Southwestern Medical Center , Dallas , TX , USA.,Department of Pathology, Children's Health , Dallas , TX , USA.,Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Midori Mitui
- Department of Pathology, Children's Health , Dallas , TX , USA
| | - Dania D Lopez
- Department of Pathology, Children's Health , Dallas , TX , USA
| | - Charles F Timmons
- Department of Pathology, University of Texas Southwestern Medical Center , Dallas , TX , USA.,Department of Pathology, Children's Health , Dallas , TX , USA
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