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Fetal hemoglobin, or foetal haemoglobin (also hemoglobin F, HbF, or α 2 γ 2) is the main oxygen carrier protein in the human fetus.Hemoglobin F is found in fetal red blood cells, and is involved in transporting oxygen from the mother's bloodstream to organs and tissues in the fetus.
In persons with sickle cell disease, high levels of fetal hemoglobin as found in a newborn or as found abnormally in persons with hereditary persistence of fetal hemoglobin, the HbF causes the sickle cell disease to be less severe. In essence the HbF inhibits polymerization of HbS. A similar mechanism occurs with persons who have sickle cell trait.
The normal hemoglobin types are Hemoglobin A (HbA), which makes up 95–98% of total hemoglobin in adults, Hemoglobin A2 (HbA2), which constitutes 2–3% of total hemoglobin in adults, and Hemoglobin F (HbF), which is the predominant hemoglobin in the fetus during pregnancy, and may persist in small amounts in adults. [1] Hemoglobin variants ...
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 ...
Fetal Hemoglobin is a member of erythrocytes called F-cells. [3] It is a tetramer protein with 2 alpha and 2 gamma subunits. This is different from adult hemoglobin because it has 2 alpha and 2 beta subunits. Fetal hemoglobin is coded by a gene on chromosome 11. The gamma subunit on fetal hemoglobin contains a neutral and nonpolar amino acid at ...
n/a Ensembl ENSG00000213934 n/a UniProt P69891 n/a RefSeq (mRNA) NM_000559 n/a RefSeq (protein) NP_000550 n/a Location (UCSC) Chr 11: 5.25 – 5.25 Mb n/a PubMed search n/a Wikidata View/Edit Human Hemoglobin subunit gamma-1 is a protein that in humans is encoded by the HBG1 gene. Function The gamma globin genes (HBG1 and HBG2) are normally expressed in the fetal liver, spleen and bone marrow ...
[13] [14] Blood typing would also detect maternal blood, as the I antigen only occurs in adults. [12] The Kleihauer–Betke test can detect very small amounts of maternal blood before the third trimester of pregnancy by monitoring hemoglobin elution in acid because adult and fetal hemoglobin elute differently in acid. [12]
Fetal hemoglobin is resistant to alkali (basic) denaturation, whereas adult hemoglobin is susceptible to such denaturation. Therefore, exposing the blood specimen to sodium hydroxide will denature the adult but not the fetal hemoglobin. The fetal hemoglobin will appear as a pinkish color under the microscope while the adult hemoglobin will ...