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Hemoglobin variants occur when there are mutations in specific genes that code for the protein chains, known as globins, which make up the hemoglobin molecule. This leads to amino acid substitutions in the hemoglobin molecule that could affect the structure, properties, and/or the stability of the hemoglobin molecule.
Hemoglobin D (HbD) is a variant of hemoglobin, a protein complex that makes up red blood cells.Based on the locations of the original identification, it has been known by several names such as hemoglobin D-Los Angeles, hemoglobin D-Punjab, [1] D-North Carolina, D-Portugal, D-Oak Ridge, and D-Chicago. [2]
Hemoglobin variants are not necessarily pathological. For example, Hb Lepore-Boston and G-Waimanalo are two variants which are non-pathological. [38] There are in excess of 1,000 known hemoglobin variants. [39] A research database of hemoglobin variants is maintained by Penn State University. [40] A few of these variants are listed below.
n/a Ensembl ENSG00000223609 n/a UniProt P02042 n/a RefSeq (mRNA) NM_000519 n/a RefSeq (protein) NP_000510 n/a Location (UCSC) Chr 11: 5.23 – 5.24 Mb n/a PubMed search n/a Wikidata View/Edit Human Hemoglobin subunit delta is a protein that in humans is encoded by the HBD gene. Function The delta (HBD) and beta (HBB) genes are normally expressed in the adult: two alpha chains plus two beta ...
Within the medical specialty of hematology, Hemoglobin D-Punjab, also known as hemoglobin D-Los Angeles, [1] D-North Carolina, D-Portugal, D-Oak Ridge, and D-Chicago, [2] is a hemoglobin variant. It originates from a point mutation in the human β-globin locus and is one of the most common hemoglobin variants worldwide. [ 1 ]
A variant hemoglobin, called fetal hemoglobin (HbF, α 2 γ 2), is found in the developing fetus, and binds oxygen with greater affinity than adult hemoglobin. This means that the oxygen binding curve for fetal hemoglobin is left-shifted (i.e., a higher percentage of hemoglobin has oxygen bound to it at lower oxygen tension), in comparison to ...
Hemoglobin A2 (HbA 2) is a normal variant of hemoglobin A that consists of two alpha and two delta chains (α 2 δ 2) and is found at low levels in normal human blood.Hemoglobin A2 may be increased in beta thalassemia or in people who are heterozygous for the beta thalassemia gene.
The most commonly used method for Hemoglobin analysis used is alkaline cellulose acetate electrophoresis at pH 8.6, due to its ability to split hemoglobin into its common variants, however a review of the College of American Pathologists (CAP) Hemoglobinopahty Survey Reports has provided the number of laboratories that utilise high-performance ...