Category Archives: Genetic Medicine

This article is about genetic tests for disease and ancestry or biological relationships. For use in forensics, see DNA profiling.

Genetic testing, also known as DNA testing, allows the genetic diagnosis of vulnerabilities to inherited diseases, and can also be used to determine a child's parentage (genetic mother and father) or in general a person's ancestry or biological relationship between people. In addition to studying chromosomes to the level of individual genes, genetic testing in a broader sense includes biochemical tests for the possible presence of genetic diseases, or mutant forms of genes associated with increased risk of developing genetic disorders. Genetic testing identifies changes in chromosomes, genes, or proteins.[1] The variety of genetic tests has expanded throughout the years. In the past, the main genetic tests searched for abnormal chromosome numbers and mutations that lead to rare, inherited disorders. Today, tests involve analyzing multiple genes to determine the risk of developing certain more common diseases such as heart disease and cancer.[2] The results of a genetic test can confirm or rule out a suspected genetic condition or help determine a person's chance of developing or passing on a genetic disorder. Several hundred genetic tests are currently in use, and more are being developed.[3][4]

Because genetic mutations can directly affect the structure of the proteins they code for, testing for specific genetic diseases can also be accomplished by looking at those proteins or their metabolites, or looking at stained or fluorescent chromosomes under a microscope.[5]

This article focuses on genetic testing for medical purposes. DNA sequencing, which actually produces a sequences of As, Cs, Gs, and Ts, is used in molecular biology, evolutionary biology, metagenomics, epidemiology, ecology, and microbiome research.

Genetic testing is "the analysis of chromosomes (DNA), proteins, and certain metabolites in order to detect heritable disease-related genotypes, mutations, phenotypes, or karyotypes for clinical purposes."[6] It can provide information about a person's genes and chromosomes throughout life. Available types of testing include:

Non-diagnostic testing includes:

Many diseases have a genetic component with tests already available.

over-absorption of iron; accumulation of iron in vital organs (heart, liver, pancreas); organ damage; heart disease; cancer; liver disease; arthritis; diabetes; infertility; impotence[15]

Obstructive lung disease in adults; liver cirrhosis during childhood; when a newborn or infant has jaundice that lasts for an extended period of time (more than a week or two), an enlarged spleen, ascites (fluid accumulation in the abdominal cavity), pruritus (itching), and other signs of liver injury; persons under 40 years of age that develops wheezing, a chronic cough or bronchitis, is short of breath after exertion and/or shows other signs of emphysema (especially when the patient is not a smoker, has not been exposed to known lung irritants, and when the lung damage appears to be located low in the lungs); when you have a close relative with alpha-1 antitrypsin deficiency; when a patient has a decreased level of A1AT.

Elevation of both serum cholesterol and triglycerides; accelerated atherosclerosis, coronary heart disease; cutaneous xanthomas; peripheral vascular disease; diabetes mellitus, obesity or hypothyroidism

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Genetic testing - Wikipedia, the free encyclopedia

Medical genetics is the specialty of medicine that involves the diagnosis and management of hereditary disorders. Medical genetics differs from human genetics in that human genetics is a field of scientific research that may or may not apply to medicine, but medical genetics refers to the application of genetics to medical care. For example, research on the causes and inheritance of genetic disorders would be considered within both human genetics and medical genetics, while the diagnosis, management, and counseling of individuals with genetic disorders would be considered part of medical genetics.

In contrast, the study of typically non-medical phenotypes such as the genetics of eye color would be considered part of human genetics, but not necessarily relevant to medical genetics (except in situations such as albinism). Genetic medicine is a newer term for medical genetics and incorporates areas such as gene therapy, personalized medicine, and the rapidly emerging new medical specialty, predictive medicine.

Medical genetics encompasses many different areas, including clinical practice of physicians, genetic counselors, and nutritionists, clinical diagnostic laboratory activities, and research into the causes and inheritance of genetic disorders. Examples of conditions that fall within the scope of medical genetics include birth defects and dysmorphology, mental retardation, autism, and mitochondrial disorders, skeletal dysplasia, connective tissue disorders, cancer genetics, teratogens, and prenatal diagnosis. Medical genetics is increasingly becoming relevant to many common diseases. Overlaps with other medical specialties are beginning to emerge, as recent advances in genetics are revealing etiologies for neurologic, endocrine, cardiovascular, pulmonary, ophthalmologic, renal, psychiatric, and dermatologic conditions.

In some ways, many of the individual fields within medical genetics are hybrids between clinical care and research. This is due in part to recent advances in science and technology (for example, see the Human genome project) that have enabled an unprecedented understanding of genetic disorders.

Clinical genetics is the practice of clinical medicine with particular attention to hereditary disorders. Referrals are made to genetics clinics for a variety of reasons, including birth defects, developmental delay, autism, epilepsy, short stature, and many others. Examples of genetic syndromes that are commonly seen in the genetics clinic include chromosomal rearrangements, Down syndrome, DiGeorge syndrome (22q11.2 Deletion Syndrome), Fragile X syndrome, Marfan syndrome, Neurofibromatosis, Turner syndrome, and Williams syndrome.

Physicians who practice clinical genetics are accredited by the American Board of Medical Genetics and Genomics (ABMGG). [1] In order to become a board-certified practitioner of Clinical Genetics, a physician must complete a minimum of 24 months of training in a program accredited by the ABMGG. Individuals seeking acceptance into clinical genetics training programs must hold an M.D. or D.O. degree (or their equivalent) and have completed a minimum of 24 months of training in an ACGME-accredited residency program in internal medicine, pediatrics, obstetrics and gynecology, or other medical specialty. [2]

Metabolic (or biochemical) genetics involves the diagnosis and management of inborn errors of metabolism in which patients have enzymatic deficiencies that perturb biochemical pathways involved in metabolism of carbohydrates, amino acids, and lipids. Examples of metabolic disorders include galactosemia, glycogen storage disease, lysosomal storage disorders, metabolic acidosis, peroxisomal disorders, phenylketonuria, and urea cycle disorders.

Cytogenetics is the study of chromosomes and chromosome abnormalities. While cytogenetics historically relied on microscopy to analyze chromosomes, new molecular technologies such as array comparative genomic hybridization are now becoming widely used. Examples of chromosome abnormalities include aneuploidy, chromosomal rearrangements, and genomic deletion/duplication disorders.

Molecular genetics involves the discovery of and laboratory testing for DNA mutations that underlie many single gene disorders. Examples of single gene disorders include achondroplasia, cystic fibrosis, Duchenne muscular dystrophy, hereditary breast cancer (BRCA1/2), Huntington disease, Marfan syndrome, Noonan syndrome, and Rett syndrome. Molecular tests are also used in the diagnosis of syndromes involving epigenetic abnormalities, such as Angelman syndrome, Beckwith-Wiedemann syndrome, Prader-willi syndrome, and uniparental disomy.

Mitochondrial genetics concerns the diagnosis and management of mitochondrial disorders, which have a molecular basis but often result in biochemical abnormalities due to deficient energy production.

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Medical genetics - Wikipedia, the free encyclopedia

The Section of Genetic Medicine was created in May 2005 to both build research infrastructure in genetics within the Department of Medicine and to focus translational efforts related to genetics. As a result, the Section of Genetic is shaping the future of precision medicine with very active and successful research programs focused on the quantitative genetics, systems biology and genomics, and bioinformatics and computational biology. The Section provides extremely valuable collaborations with investigators in the Department of Medicine who are seeking to develop new and more powerful ways to identify genetic risk factors for common, complex disorders with almost immediate clinical application.

The Section of Genetic Medicine has a reputation for leading-edge research. In FY 14 the Section was awarded a large grant from the National Cancer Institute to build an Open Genomics Data Commons (OGDC)under the direction of Dr. Robert Grossman and is also home to the NIH funded Silvio O. Conte Center, led by Andrey Rzhetsky, PhD, where computational data-mining has been applied to understand the causes of neuropsychiatric disorders. We invite you to explore our website for more information about the Section.

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Genetic Medicine - The University of Chicago Department of ...

What is a genetic disease?

A genetic disease is any disease that is caused by an abnormality in an individual's genome, the person's entire genetic makeup. The abnormality can range from minuscule to major -- from a discrete mutation in a single base in the DNA of a single gene to a gross chromosome abnormality involving the addition or subtraction of an entire chromosome or set of chromosomes. Some genetic disorders are inherited from the parents, while other genetic diseases are caused by acquired changes or mutations in a preexisting gene or group of genes. Mutations can occur either randomly or due to some environmental exposure.

There are a number of different types of genetic inheritance, including the following four modes:

Single gene inheritance, also called Mendelian or monogenetic inheritance. This type of inheritance is caused by changes or mutations that occur in the DNA sequence of a single gene. There are more than 6,000 known single-gene disorders, which occur in about 1 out of every 200 births. These disorders are known as monogenetic disorders (disorders of a single gene).

Some examples of monogenetic disorders include:

Single-gene disorders are inherited in recognizable patterns: autosomal dominant, autosomal recessive, and X-linked.

Medically Reviewed by a Doctor on 5/21/2015

Genetic Disease - Symptoms Question: What were the symptoms of a genetic disease in you or a relative?

Genetic Disease - Screening Question: Have you been screened for a genetic disease? Please share your story.

Genetic Disease - Personal Experience Question: Is there a genetic disease in your family? Please share your experience.

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Genetic Disease: Get the Definition of These Disorders

BCH Division of Genetics and Genomics Seminar

Generating Cartilage from Human Pluripotent Stem Cells: A Developmental Approach.

Special Seminar

How Neurons Talk to the Blood: Sensory Regulation of Hematopoiesis in the Drosophila Model

Genetics Seminar Series

Neural Reprogramming of Germline Cells and Trans-Generational Memory in Drosophila

BCH Division of Genetics and Genomics Seminar

Genetics Seminar Series - Focused Seminars

Reflecting the breadth of the field itself, the Department of Genetics at Harvard Medical School houses a faculty working on diverse problems, using a variety of approaches and model organisms, unified in their focus on the genome as an organizing principle for understanding biological phenomena. Genetics is not perceived simply as a subject, but rather as a way of viewing and approaching biological phenomena.

While the range of current efforts can best be appreciated by reading the research interests of individual faculty, the scope of the work conducted in the Department includes (but is by no means limited to) human genetics of both single gene disorders and complex traits, development of genomic technology, cancer biology, developmental biology, signal transduction, cell biological problems, stem cell biology, computational genetics, immunology, synthetic biology, epigenetics, evolutionary biology and plant biology.

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Medical Genetics Faculty, Fellows & Staff: 2014

The University of Washington Department of Medicine is recruiting for one (1) full-time faculty position at the Associate Professor, or Professor level in the Division of Medical Genetics, Department of Medicine. This position is offered with state tenure funding.

Successful candidates for this position will have an M.D./Ph.D. or M.D. degree (or foreign equivalent), clinical expertise in genetics, and will be expected to carry out a successful research program. Highly translational PhD (or foreign equivalent) scientists may be considered. Although candidates with productive research programs in translational genetics/genomics and/or precision medicine will be prioritized, investigators engaged in gene therapy research may also be considered.

The position will remain open until filled. Send CV and 1-2 page letter of interest to:

Medical Genetics Faculty Search c/o Sara Carlson Division of Medical Genetics University of Washington seisner@u.washington.edu

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Medical Genetics at University of Washington