Hb Fulton-Georgia [α20(B1)HisâPro; HBA1: c.62A>C]: a new α-globin variant coinherited with α-thalassemia-2 (3.7 kb deletion) and Hb SC disease.
Hemoglobin
; 37(5): 481-5, 2013.
Article
in En
| MEDLINE
| ID: mdl-24006930
ABSTRACT
We report a novel hemoglobin (Hb) variant that we named Hb Fulton-Georgia, caused by a point mutation in exon 1/codon 20 of the α-globin gene [α20(B1)HisâPro; HBA1 c.62A>C]. This α chain variant was identified in an adult African-American female with Hb SC disease who was also heterozygous for the α-thalassemia-2 (α-thal-2) (3.7 kb deletion or αα/-α(3.7)). The Hb Fulton-Georgia mutation was located on the intact α1-globin gene not involved by α-thal-2. Molecular models indicated that the α20 residue of Hb Fulton-Georgia was the first amino acid of the B helix, and was not involved in α1/ß1 or α1/ß2 contacts in Hb S [ß6(A3)GluâVal; HBB c.20A>T] or Hb C [ß6(A3)GluâLys; HBB c.19G>A] tetramers. Furthermore, the histidineâproline substitution at α20 did not disrupt the helical structure. High performance liquid chromatography (HPLC) detected Hb Fulton-Georgia in 16.0% of total Hb, consistent with inheritance on the α1 gene. Coinheritance of Hb Fulton-Georgia, heterozygous α-thal-2 and Hb SC disease was associated with a mild phenotype, consisting of microcytosis and anisocytosis, but no anemia or other hematological abnormality.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Glycated Hemoglobin
/
Hemoglobins, Abnormal
/
Point Mutation
Type of study:
Prognostic_studies
Limits:
Adult
/
Female
/
Humans
Language:
En
Journal:
Hemoglobin
Year:
2013
Type:
Article
Affiliation country:
United States