Mihael H. Polymeropoulos (born February 27, 1960) is a Greek-American physician and scientist. He is known for his work in the Human Genome Project and the discovery of mutations in the alpha synuclein gene as the first genetic cause of Parkinson's disease while at the National Institutes of Health. [1] [2] [3] He is currently the CEO and Chairman of the Board of Vanda Pharmaceuticals [4] a publicly traded company based in Washington DC which he co-founded in 2003. [5]
After graduating from the University of Patras School of Medicine at age 23, he pursued his passion for molecular genetics research and joined the laboratory of Dr Sankar Adhya at the National Cancer Institute of the National Institutes of Health. At the NCI he studied the molecular regulation of transcription of the bacterial galactose operon of E. Coli through the interaction of the galactose repressor molecule with the two galactose operator sites. He continued his training and completed a residency in Psychiatry at the National Institutes of Mental Health, St Elizabeth's Hospital in Washington DC.
From 1988 to 1998 he focused his research on the study of human genetics and by developing microsatellite genetic markers that aided in the development of generic maps for the Human Genome Project. He co-founded the IMAGE consortium an international consortium for the identification and mapping of all human genome transcripts with Charles Auffray, Bento Soares and Gregg Lennon. [6] [7]
He joined the National Human Genome Research Institute where he concentrated on the identification and mapping of human disease. He identified the genetic location of numerous genetic disorders including the gene for Wolfram disorder, [8] pyknodysostosis, [9] Ellis van Creveld syndrome, [10] proximal symphalangism, [11] cavernous hemangiomas, [12] Neimann Pick Type C [13] among others. In 1996 he published on the mapping of the first genetic locus for Parkinson's disease and in 1997 he reported on the identification of mutation in the alpha synuclein gene in a group of Italian and Greek pedigrees [1] [2] . [14] This discovery ushered a new era in the understanding of the molecular underpinnings of Parkinson's disease and other neurodegenerative disorders collectively now known as synucleinopathies. His 1997 publication on the alpha synuclein mutation in Parkinson's disease families is one of the most cited publications in this field with over 10,000 citations to date. [15]
Molecular genetics is a branch of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms. Molecular genetics often applies an "investigative approach" to determine the structure and/or function of genes in an organism's genome using genetic screens.
Alpha-synuclein (aSyn) is a protein that, in humans, is encoded by the SNCA gene. Alpha-synuclein is a neuronal protein that regulates synaptic vesicle trafficking and subsequent neurotransmitter release.
Mosaicism or genetic mosaicism is a condition in which a multicellular organism possesses more than one genetic line as the result of genetic mutation. This means that various genetic lines resulted from a single fertilized egg. Mosaicism is one of several possible causes of chimerism, wherein a single organism is composed of cells with more than one distinct genotype.
Ubiquitin carboxy-terminal hydrolase L1 is a deubiquitinating enzyme.
Parkin is a 465-amino acid residue E3 ubiquitin ligase, a protein that in humans and mice is encoded by the PARK2 gene. Parkin plays a critical role in ubiquitination – the process whereby molecules are covalently labelled with ubiquitin (Ub) and directed towards degradation in proteasomes or lysosomes. Ubiquitination involves the sequential action of three enzymes. First, an E1 ubiquitin-activating enzyme binds to inactive Ub in eukaryotic cells via a thioester bond and mobilises it in an ATP-dependent process. Ub is then transferred to an E2 ubiquitin-conjugating enzyme before being conjugated to the target protein via an E3 ubiquitin ligase. There exists a multitude of E3 ligases, which differ in structure and substrate specificity to allow selective targeting of proteins to intracellular degradation.
Noggin, also known as NOG, is a protein that is involved in the development of many body tissues, including nerve tissue, muscles, and bones. In humans, noggin is encoded by the NOG gene. The amino acid sequence of human noggin is highly homologous to that of rat, mouse, and Xenopus.
Contursi Terme is a village and comune in the province of Salerno in the Campania region of south-western Italy.
Synucleins are a family of soluble proteins common to vertebrates, primarily expressed in neural tissue and in certain tumors.
Rosselli–Gulienetti syndrome, also known as Zlotogora–Ogur syndrome and Bowen–Armstrong syndrome, is a type of congenital ectodermal dysplasia syndrome. The syndrome is relatively rare and has only been described in a few cases.
Beta-synuclein is a protein that in humans is encoded by the SNCB gene.
Leucine-rich repeat kinase 2 (LRRK2), also known as dardarin and PARK8, is a large, multifunctional kinase enzyme that in humans is encoded by the LRRK2 gene. LRRK2 is a member of the leucine-rich repeat kinase family. Variants of this gene are associated with an increased risk of Parkinson's disease and Crohn's disease.
A 2-oxoisovalerate dehydrogenase subunit alpha, mitochondrial is an enzyme that in humans is encoded by the BCKDHA gene.
Pycnodysostosis is a lysosomal storage disease of the bone caused by a mutation in the gene that codes the enzyme cathepsin K. It is also known as PKND and PYCD.
Gene redundancy is the existence of multiple genes in the genome of an organism that perform the same function. Gene redundancy can result from gene duplication. Such duplication events are responsible for many sets of paralogous genes. When an individual gene in such a set is disrupted by mutation or targeted knockout, there can be little effect on phenotype as a result of gene redundancy, whereas the effect is large for the knockout of a gene with only one copy. Gene knockout is a method utilized in some studies aiming to characterize the maintenance and fitness effects functional overlap.
The history of Parkinson's disease expands from 1817, when British apothecary James Parkinson published An Essay on the Shaking Palsy, to modern times. Before Parkinson's descriptions, others had already described features of the disease that would bear his name, while the 20th century greatly improved knowledge of the disease and its treatments. PD was then known as paralysis agitans. The term "Parkinson's disease" was coined in 1865 by William Sanders and later popularized by French neurologist Jean-Martin Charcot.
Andrew B. Singleton is a British neurogeneticist currently working in the USA. He was born in Guernsey, the Channel Islands in 1972, where he lived until he was 18 years old. His secondary education was conducted at the Guernsey Grammar School. He earned a first class degree in Applied Physiology from Sunderland University and his PhD in neuroscience from the University of Newcastle upon Tyne where he studied the genetics of Alzheimer's disease and other dementias at the Medical Research Council (MRC) Neurochemical Pathology Unit. He moved to the United States in 1999, where he began working at the Mayo Clinic in Jacksonville, Florida studying the genetic basis of Parkinson's disease, ataxia, and dystonia. He moved to the National Institutes of Health in 2001 to head the newly formed Molecular Genetics unit within the Laboratory of Neurogenetics. In 2006 he took over as Chief of the Laboratory of Neurogenetics and became an NIH Distinguished Investigator in the intramural program at the National Institute on Aging (NIA) in 2017. In 2020 he stepped down as the Chief of the Laboratory of Neurogenetics and became the Acting Director of the newly formed Center for Alzheimer's and Related Dementias at the NIA. In 2021 he became the Director of CARD.
Parkinson's disease (PD) is a complicated neurodegenerative disease that progresses over time and is marked by bradykinesia, tremor, and stiffness. As the condition worsens, some patients may also experience postural instability. Parkinson's disease (PD) is primarily caused by the gradual degeneration of dopaminergic neurons in the region known as the substantia nigra along with other monoaminergic cell groups throughout the brainstem, increased activation of microglia, and the build-up of Lewy bodies and Lewy neurites, which are proteins found in surviving dopaminergic neurons.
Alice M. Lazzarini is a scientist, author and researcher on neurogenetic disorders, including Huntington's disease and Parkinson's disease. She is an assistant professor of Neurology at Rutgers Robert Wood Johnson Medical School, where her work helped establish the genetic basis of Parkinson's. Later in life, she was diagnosed with Parkinson's—the very disease she had spent decades researching.
Clair A. Francomano is an American medical geneticist and academic specializing in Ehlers–Danlos syndromes. She is Professor of Medical and Molecular Genetics at Indiana University.
Early-onset parkinsonism-intellectual disability syndrome is a very rare genetic disorder which is characterized by intellectual disabilities, psychomotor developmental delays, macrocephaly, and Parkinson's disease which starts before the age of 45. Additional symptoms include epilepsy, strabismus, and frontal bossing.
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