Research focused on discovering the genetic component in developing Autosomal Dominant (AD) has also contributed greatly to the understanding the genetics behind normal or "non-pathological" aging. Autosomal Dominant (AD) - Autosomal dominant is a pattern of inheritance characteristic of some genetic disorders. "Autosomal" means that the gene in question is located on one of the numbered, or non-sex, chromosomes. "Dominant" means that a single copy of the mutated gene (from one parent) is enough to cause the disorder.The human brain shows a decline in function and a change in gene expression. This modulation in gene expression may be due to oxidative DNA damage at promoter regions in the genome. Genes that are down-regulated over the age of 40 include:

GluR1 AMPA receptor subunit
NMDA R2A receptor subunit (involved in learning)
Subunits of the GABA-A receptor
Genes involved in long-term potentiation e.g. calmodulin 1 and CAM kinase II alpha. Calcium signaling genes
Synaptic plasticity genes
Synaptic vesicle release and recycling genesGenes that are upregulated include:

Genes associated with stress response and DNA repair
Antioxidant defence

Epigenetic age analysis of brain regions
The cerebellum is the youngest brain region (and probably body part) in centenarians according to an epigenetic biomarker of tissue age known as epigenetic clock: it is about 15 years younger than expected in a centenarian. By contrast, all brain regions and brain cells appear to have roughly the same epigenetic age in subjects who are younger than 80.
According to the Oxford Review, chloramphenicol given to mothers during their pregnancy did not result in gray baby syndrome, but was caused by infants receiving supra-therapeutic doses of chloramphenicol after birth. The presentation of symptoms can depend on the level of exposure of the drug to the baby, given its dose-related nature. A broad diagnosis is usually needed for babies who present with cyanosis. To support the diagnosis, blood work should be done to determine the level of serum chloramphenicol, and to further evaluate chloramphenicol toxicity, a complete blood panel including levels of serum ketones, glucose (due to the risk of hypoglycemia), metabolic panel should be completed to help determine if an infant has the syndrome. Other tools used to help with diagnosis include CT scans, ultrasound, and electrocardiogram. Prevention
Since the syndrome is a side effect of chloramphenicol, the prevention is primarily related to the proper use of the medication. The WHO Model Formulary for Children 2010 recommends to reserve chloramphenicol for life-threatening infections. As well as using chloramphenicol only when necessary, it should also be used in short periods of time to also prevent the potential for toxicity. In particular, this medication should not be prescribed especially in neonates less than one week old due to the significant risk of toxicity. Preterm infants especially should not be administered chloramphenicol.