Related Experiment Video
Updated: Aug 11, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells
Published on: July 9, 2015
Hereditary methemoglobinemia
1Department of Paediatrics, Dow University of Health Sciences and Civil Hospital, Karachi. drasjpk@yahoo.com
Abstract:
Methemoglobinemia is a rare congenital disorder of blood associated with central cyanosis. We report a case of 12 years old male child who had asymptomatic central cyanosis since birth in the absence of any cyanotic cardiorespiratory disease. He shared this cyanosis with seven other family members spanning over three generations. He was diagnosed as a case of methemoglobinemia on the basis of history and investigations, put on methylene blue and later ascorbic acid, to which he showed a very good response.
Related Concept Videos
Inborn Errors of Metabolism
Hemoglobin
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
Animal Mitochondrial Genetics
Genetic Lingo
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Lethal Alleles
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
