Tipos de hemoglobinas

Types of Hemoglobin

Introduction to Hemoglobin

• Hemoglobin is a conjugated protein composed of a prosthetic group (heme) and a basic protein called globin.

• It consists of four globin chains, making it a tetrameric molecule that houses four heme groups within its structure.

Function and Location

• The primary function of hemoglobin is to transport oxygen in the blood, which is crucial for cellular respiration.

• Hemoglobin is located within red blood cells (erythrocytes), where it plays an essential role in oxygen delivery.

Structure of Hemoglobin

• The molecular mass of hemoglobin is approximately 64,500 daltons, and it also functions as a buffering system in the blood.

• A typical hemoglobin structure (HbA1) consists of two alpha chains and two beta chains, forming an ovoid shape with heme molecules embedded inside.

Different Types of Hemoglobins

Major Types

• HbA1 is the most common type found in adults, comprising about 95% of total adult hemoglobin; its composition is α2β2.

• HbA2 has less prevalence (<5%) and consists of two alpha chains and two delta chains (α2δ2).

Fetal and Embryonic Hemoglobins

• Fetal hemoglobin (HbF), present during the last six months of intrauterine life, comprises two alpha chains and two gamma chains (α2γ2).

• Embryonic hemoglobins include Gower 1 (ε2ζ2), Gower 2 (α2ε2), and Portland (ζ2γ2), which are produced between the first and third month of gestation.

Glycosylated Hemoglobins

Importance in Diabetes Management