Category Archives: Genetic Medicine

Welcome to Genetics in Medicine

Genetics in Medicine, the official journal of the American College of Medical Genetics and Genomics, offers an unprecedented forum for the presentation of innovative, clinically relevant papers in contemporary genetic medicine. Stay tuned for cutting-edge clinical research in areas such as genomics, chromosome abnormalities, metabolic diseases, single gene disorders and genetic aspects of common complex diseases.

For detailed information about how to prepare your article and our editorial policies, please refer to our Instructions for Authors.

Volume 17, No 7 July 2015 ISSN: 1098-3600 EISSN: 1530-0366

2014 Impact Factor 7.329* 15/167 Genetics & Heredity

Editor-in-Chief: James P. Evans, MD, PhD

*2014 Journal Citation Reports Science Edition (Thomson Reuters, 2015)

This month's GenePod explores how genomic testing might be used to close the disparity for individuals who have little or no access to family medical history, which puts them at a clear disadvantage with regard to aspects of their medical care. Tune in to July's GenePod, or subscribe now!

Join the Genetics in Medicine community on Twitter and Facebook for the latest research and news!

View the most recent special issue on incidental findings, and many other special issues!

View post:
Genetics in Medicine

Leadership

Michael Bamshad, MD Professor Division Chief

The Division of Genetic Medicine is committed to providing an outstanding level of patient care, education and research. The faculty have diverse interests and are drawn from several disciplines including clinical genetics, molecular genetics, biochemical genetics, human embryology/teratology and neurology.

A large clinical program of medical genetics operates from Seattle Childrens Hospital staffed by faculty from the Division. These clinical activities concentrate on pediatric genetics but also encompass adult and fetal consultations. At Seattle Children's full IP consultations are available and general genetics clinics occur regularly. Consultative services are also provided to the University of Washington Medical Center and Swedish Hospital. In addition, a variety of interdisciplinary clinical services are provided at Childrens including cardiovascular genetics, skeletal dysplasia, neurofibromatosis, craniofacial genetics, gender disorders, neurogenetics and biochemical genetics as well as others. A very large regional genetics service sponsored by state Departments of Health are provided to multiple outreach clinical sites in both Alaska and Washington.

Our research holds the promise for both continued development of improved molecular diagnostic tools and successful treatment of inherited diseases. Research in the Division is highly patient-driven. It often begins with a physician identifying a particular patients problems and subsequently taking that problem into a laboratory setting for further analysis. The Division has a strong research focus with established research programs in medical genetics information systems, neurogenetic disorders, fetal alcohol syndrome, neuromuscular diseases, human teratology, population genetics/evolution and gene therapy.

The Division offers comprehensive training for medical students, residents, and postdoctoral fellows in any of the areas of our clinical and research programs relevant to medical genetics. Medical Genetics Training Website

Margaret L.P. Adam, MD Associate Professor mpa5@u.washington.edu

See the original post here:
Genetic Medicine | Department of Pediatrics | University ...

Although advances in genetic testing have improved doctors' ability to diagnose and treat certain illnesses, there are still some limits. Genetic tests can identify a particular problem gene, but can't always predict how severely that gene will affect the person who carries it. In cystic fibrosis, for example, finding a problem gene on chromosome number 7 can't necessarily predict whether a child will have serious lung problems or milder respiratory symptoms.

Also, simply having problem genes is only half the story because many illnesses develop from a mix of high-risk genes and environmental factors. Knowing that you carry high-risk genes may actually be an advantage if it gives you the chance to modify your lifestyle to avoid becoming sick.

As research continues, genes are being identified that put people at risk for illnesses like cancer, heart disease, psychiatric disorders, and many other medical problems. The hope is that someday it will be possible to develop specific types of gene therapy to totally prevent some diseases and illnesses.

Gene therapy is already being used studied as a possible way to treat conditions like cystic fibrosis, cancer, and ADA deficiency (an immune deficiency), sickle cell disease, hemophilia, and thalassemia. However, severe complications have occurred in some patients receiving gene therapy, so current research with gene therapy is very carefully controlled.

Although genetic treatments for some conditions may be a long way off, there is still great hope that many more genetic cures will be found. The Human Genome Project, which was completed in 2003, identified and mapped out all of the genes (about 25,000) carried in our human chromosomes. The map is just the start, but it's a very hopeful beginning.

Reviewed by: Larissa Hirsch, MD Date reviewed: April 2014 Originally reviewed by: Louis E. Bartoshesky, MD, MPH

Continued here:
Genetics and Genetic Testing - KidsHealth

Genetic engineering, also called genetic modification, is the direct manipulation of an organism's genome using biotechnology. New DNA may be inserted in the host genome by first isolating and copying the genetic material of interest using molecular cloning methods to generate a DNA sequence, or by synthesizing the DNA, and then inserting this construct into the host organism. Genes may be removed, or "knocked out", using a nuclease. Gene targeting is a different technique that uses homologous recombination to change an endogenous gene, and can be used to delete a gene, remove exons, add a gene, or introduce point mutations.

An organism that is generated through genetic engineering is considered to be a genetically modified organism (GMO). The first GMOs were bacteria generated in 1973 and GM mice in 1974. Insulin-producing bacteria were commercialized in 1982 and genetically modified food has been sold since 1994. Glofish, the first GMO designed as a pet, was first sold in the United States December in 2003.[1]

Genetic engineering techniques have been applied in numerous fields including research, agriculture, industrial biotechnology, and medicine. Enzymes used in laundry detergent and medicines such as insulin and human growth hormone are now manufactured in GM cells, experimental GM cell lines and GM animals such as mice or zebrafish are being used for research purposes, and genetically modified crops have been commercialized.

IUPAC definition

Process of inserting new genetic information into existing cells in order to modify a specific organism for the purpose of changing its characteristics.

Note: Adapted from ref.[2][3]

Genetic engineering alters the genetic make-up of an organism using techniques that remove heritable material or that introduce DNA prepared outside the organism either directly into the host or into a cell that is then fused or hybridized with the host.[4] This involves using recombinant nucleic acid (DNA or RNA) techniques to form new combinations of heritable genetic material followed by the incorporation of that material either indirectly through a vector system or directly through micro-injection, macro-injection and micro-encapsulation techniques.

Genetic engineering does not normally include traditional animal and plant breeding, in vitro fertilisation, induction of polyploidy, mutagenesis and cell fusion techniques that do not use recombinant nucleic acids or a genetically modified organism in the process.[4] However the European Commission has also defined genetic engineering broadly as including selective breeding and other means of artificial selection.[5]Cloning and stem cell research, although not considered genetic engineering,[6] are closely related and genetic engineering can be used within them.[7]Synthetic biology is an emerging discipline that takes genetic engineering a step further by introducing artificially synthesized material from raw materials into an organism.[8]

If genetic material from another species is added to the host, the resulting organism is called transgenic. If genetic material from the same species or a species that can naturally breed with the host is used the resulting organism is called cisgenic.[9] Genetic engineering can also be used to remove genetic material from the target organism, creating a gene knockout organism.[10] In Europe genetic modification is synonymous with genetic engineering while within the United States of America it can also refer to conventional breeding methods.[11][12] The Canadian regulatory system is based on whether a product has novel features regardless of method of origin. In other words, a product is regulated as genetically modified if it carries some trait not previously found in the species whether it was generated using traditional breeding methods (e.g., selective breeding, cell fusion, mutation breeding) or genetic engineering.[13][14][15] Within the scientific community, the term genetic engineering is not commonly used; more specific terms such as transgenic are preferred.

Plants, animals or micro organisms that have changed through genetic engineering are termed genetically modified organisms or GMOs.[16] Bacteria were the first organisms to be genetically modified. Plasmid DNA containing new genes can be inserted into the bacterial cell and the bacteria will then express those genes. These genes can code for medicines or enzymes that process food and other substrates.[17][18] Plants have been modified for insect protection, herbicide resistance, virus resistance, enhanced nutrition, tolerance to environmental pressures and the production of edible vaccines.[19] Most commercialised GMO's are insect resistant and/or herbicide tolerant crop plants.[20] Genetically modified animals have been used for research, model animals and the production of agricultural or pharmaceutical products. They include animals with genes knocked out, increased susceptibility to disease, hormones for extra growth and the ability to express proteins in their milk.[21]

Go here to see the original:
Genetic engineering - Wikipedia, the free encyclopedia

GENETIC TESTING TIME TOOLA Resource from the American College of Preventive Medicine

CLINICAL REFERENCEThe following Clinical Reference Document provides the evidence to support the Genetic Testing Time Tool. The following bookmarks are available to move around the Clinical Reference Document. You may also download a printable version for future reference.

Human genomics, the study of structure, function, and interactions of all genes in the human genome, promises to improve the diagnosis, treatment, and prevention of disease. The proliferation of genetic tests has been greatly accelerated by the Human Genome Project over the last decade. [1]

Meanwhile, practicing physicians and health professionals need to be trained in the principles, applications, and the limitations of genomics and genomic medicine. [2]

Over 1,500 genetic tests are now available clinically, with nearly 300 more available on a research basis only. The number of genetic tests is predicted to increase by 25% annually. [3] There is a boom in the development of genetic tests using the scanning technology from the Genome Project, but questions remain regarding the validity and usefulness of these newer tests.

Genotype: The genetic constitution of the individual; the characterization of the genes. [6]

Phenotype: The observable properties of an individual that are the product of interactions between the genotype and the environment. [6] Nucleotides: The monomeric units from which DNA or RNA polymers are constructed. They consist of a purine or pyrimidine base, a pentose sugar, and a phosphate group. [6]

Oligonucleotide: A relatively short single-stranded nucleic-acid chain usually consisting of 2 to 20 nucleotides that is synthesized to match a region where a mutation is known to occur, and then used as a probe. [6]

Single nucleotide polymorphism (SNP): A single nucleotide variation in a genetic sequence that occurs at appreciable frequency in the population. [6]

Penetrance: The probability of developing the disease in those who have the mutation. [6]

See more here:
Genetic Testing Clinical Reference For Clinicians ...

Kids with Down syndrome tend to share certain physical features such as a flat facial profile, an upward slant to the eyes, small ears, and a protruding tongue.

Low muscle tone (called hypotonia) is also characteristic of children with DS, and babies in particular may seem especially "floppy." Though this can and often does improve over time, most children with DS typically reach developmental milestones like sitting up, crawling, and walking later than other kids.

At birth, kids with DS are usually of average size, but they tend to grow at a slower rate and remain smaller than their peers. For infants, low muscle tone may contribute to sucking and feeding problems, as well as constipation and other digestive issues. Toddlers and older kids may have delays in speech and self-care skills like feeding, dressing, and toilet teaching.

Down syndrome affects kids' ability to learn in different ways, but most have mild to moderate intellectual impairment. Kids with DS can and do learn, and are capable of developing skills throughout their lives. They simply reach goals at a different pace which is why it's important not to compare a child with DS against typically developing siblings or even other children with the condition.

Kids with DS have a wide range of abilities, and there's no way to tell at birth what they will be capable of as they grow up.

While some kids with DS have no significant health problems, others may experience a host of medical issues that require extra care. For example, almost half of all children born with DS will have a congenital heart defect.

Kids with Down syndrome are also at an increased risk of developing pulmonary hypertension, a serious condition that can lead to irreversible damage to the lungs. All infants with Down syndrome should be evaluated by a pediatric cardiologist.

Approximately half of all kids with DS also have problems with hearing and vision. Hearing loss can be related to fluid buildup in the inner ear or to structural problems of the ear itself. Vision problems commonly include strabismus (cross-eyed), near- or farsightedness, and an increased risk of cataracts.

Regular evaluations by an otolaryngologist (ear, nose, and throat doctor), audiologist, and an ophthalmologist are necessary to detect and correct any problems before they affect language and learning skills.

Other medical conditions that may occur more frequently in kids with DS include thyroid problems, intestinal abnormalities, seizure disorders, respiratory problems, obesity, an increased susceptibility to infection, and a higher risk of childhood leukemia. Upper neck abnormalities are sometimes found and should be evaluated by a doctor (these can be detected by cervical spine X-rays). Fortunately, many of these conditions are treatable.

Continued here:
Kids Health - Down Syndrome