Blood-brain barrier, gut lining, globins, bone density, S100B, neurotransmitters.
Haptoglobin 1 & 2, Hemoglobin
[ame=http://en.wikipedia.org/wiki/Haptoglobin]Haptoglobin - Wikipedia, the free encyclopedia[/ame]
In blood plasma, haptoglobin binds free hemoglobin (Hb) released from erythrocytes with high affinity and thereby inhibits its oxidative activity. The haptoglobin-hemoglobin complex will then be removed by the reticuloendothelial system (mostly the spleen).
Haptoglobin-1 (Hp1) has been found in all mammals, cormorants, bony fish, not (non-diving) geese or chicken.
Haptoglobin-2 (Hp2) is found only in (80% of) humans. Hp exists in two allelic forms in the human population, so-called Hp1 and Hp2, the latter one having arisen due to the partial duplication of Hp1 gene. Three genotypes of Hp, therefore, are found in humans: Hp1-1, Hp2-1, and Hp2-2. Hp of different genotypes have been shown to bind hemoglobin with different affinities, with Hp2-2 being the weakest binder.
"While apes, monkeys and chimpanzees do not have haptoglobin 2, 80 percent of human beings have it," says Dr. Fasano. "Apes, monkeys and chimpanzees rarely develop autoimmune disorders. Human beings suffer from more than 70 different kinds of such conditions. We believe the presence of this pre-haptoglobin 2 is responsible for this difference between species."
People who suffer from celiac disease have a sensitivity to gluten, a protein found in wheat & barley (not millet & rice), and suffer gastrointestinal distress and other serious symptoms when they eat it. In celiac patients, gluten generates an exaggerated release of zonulin that makes the gut more permeable to large molecules, including gluten.
Haptoglobin is a molecule that has been known to scientists for many years. It was identified as a marker of inflammation in the body. Haptoglobin 1 is the original form of the haptoglobin molecule, and scientists believe it evolved 800 million years ago. Haptoglobin 2 is a permutation found only in humans. It's believed the mutation occurred in India about 2 million years ago, (cf Todaro baboon retrovirus which affected all African primates but not Asian primates or humans) spreading gradually among increasing numbers of people throughout the world.
Zonulin, haptoglobin 2 and autoimmunity (haptoglobin diabetes celiac diet allergies) - Mombu the Medicine Forum
zonulin = haptoglobin 2 precursor molecule
Dr. Fasano's study revealed that zonulin is the precursor molecule for haptoglobin 2 ‹ that is, it is an immature molecule that matures into haptoglobin 2. It was previously believed that such precursor molecules served no purpose in the body other than to mature into the molecules they were destined to become. But Dr. Fasano's study identifies precursor haptoglobin 2 as the first precursor molecule that serves another function entirely ‹ opening a gateway in the gut, or intestines, to let gluten in.
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Globin changes in human 6ma
The sequence of the gorilla fetal globin genes: evidence for multiple gene conversions in human evolution -- Scott et al. 1 (5): 371 -- Molecular Biology and Evolution
The sequence of the gorilla fetal globin genes: evidence for multiple gene conversions in human evolution
Two fetal globin genes (G gamma and A gamma) from one chromosome of a lowland gorilla (Gorilla gorilla gorilla) have been sequenced and compared to three human loci (a G gamma-gene and two A gamma-alleles). A comparison of regions of local homology among these five sequences indicates that long after the duplication that produced the two nonallelic gamma-globin loci of catarrhine primates, about 35 million years (Myr) ago, at least one gene conversion event occurred between these loci. This conversion occurred not long before the ancestral divergence (about 6 Myr ago) of Homo and Gorilla. After this ancestral divergence, a minimum of three more gene conversion events occurred in the human lineage. Each human A gamma-allele shares specific sequence features with the gorilla A gamma-gene; one such distinctive allelic feature involves the simple repeated sequence in IVS 2. This suggests that early in the human lineage the A gamma-genes may have undergone a crossing-over event mediated by this simple repeated sequence.
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Serotonin in the brain (sleep, emotion) vs serotonin in the gut (bone density)
http://www.sciencenews.org/view/feature/id/43994/title/Serotonin_What_the_gut_feeds_the_bones
Despite the neurotransmitter’s fame in the brain (serotonin's role in depression), 95 percent of the body’s serotonin is made in the intestine, from the amino acid tryptophan, a component of dietary protein. After a meal, the intestine turns tryptophan into serotonin, while platelets from the bloodstream ferry serotonin throughout the body. It’s an entirely separate circuitry from serotonin production in the brain. Serotonin made in the brain stays in the brain, and the two different sources don’t mingle.
http://www.sciencedirect.com/scienc...serid=10&md5=c786f0208649df5e7257f7cdda9551a3
The distribution of serotonergic fibers, determined by immunohistochemistry, in the brains of S100B-knockout mice was quite similar to that of wild-type mice. Furthermore, the content of serotonin and its metabolite 5-hydroxyindole-3-acetic acid in knockout mice was also indistinguishable from those of wild-type mice. Our findings argue against the hypothesis that S100B has a crucial role in neurite extension of serotonergic neurons.
http://www.sciencedirect.com/scienc...serid=10&md5=306dd5d7af98c2e2a3faa9883f71bf5e
Potential involvement of S100B in the protective effects of a serotonin-1a agonist on ethanol-treated astrocytes
Human vs Chimp: Since the genetic split, chimps altered their myoglobin by one amino acid, humans altered their hemoglobin by one amino acid but also produced large haptoglobin2-2 which better binds hemoglobin in the kidneys and is significant in myocardial infarction (Chapelle).