Medical genetics

Medical genetics is the branch 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, while 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 counselling people 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.

Scope

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.

Subspecialties

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

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.

In the United States, 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/biochemical genetics

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

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

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

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.

There exists some overlap between medical genetic diagnostic laboratories and molecular pathology.

Genetic counseling

Genetic counseling is the process of providing information about genetic conditions, diagnostic testing, and risks in other family members, within the framework of nondirective counseling. Genetic counselors are non-physician members of the medical genetics team who specialize in family risk assessment and counseling of patients regarding genetic disorders. The precise role of the genetic counselor varies somewhat depending on the disorder.

History

Although genetics has its roots back in the 19th century with the work of the Bohemian monk Gregor Mendel and other pioneering scientists, human genetics emerged later. It started to develop, albeit slowly, during the first half of the 20th century. Mendelian (single-gene) inheritance was studied in a number of important disorders such as albinism, brachydactyly (short fingers and toes), and hemophilia. Mathematical approaches were also devised and applied to human genetics. Population genetics was created.

Medical genetics was a late developer, emerging largely after the close of World War II (1945) when the eugenics movement had fallen into disrepute. The Nazi misuse of eugenics sounded its death knell. Shorn of eugenics, a scientific approach could be used and was applied to human and medical genetics. Medical genetics saw an increasingly rapid rise in the second half of the 20th century and continues in the 21st century.

Current practice

The clinical setting in which patients are evaluated determines the scope of practice, diagnostic, and therapeutic interventions. For the purposes of general discussion, the typical encounters between patients and genetic practitioners may involve:

Diagnostic evaluation

Each patient will undergo a diagnostic evaluation tailored to their own particular presenting signs and symptoms. The geneticist will establish a differential diagnosis and recommend appropriate testing. Increasingly, clinicians use SimulConsult, paired with the National Library of Medicine Gene Review articles, to narrow the list of hypotheses (known as the differential diagnosis) and identify the tests that are relevant for a particular patient. These tests might evaluate for chromosomal disorders, inborn errors of metabolism, or single gene disorders.

Chromosome studies

Chromosome studies are used in the general genetics clinic to determine a cause for developmental delay/mental retardation, birth defects, dysmorphic features, and/or autism. Chromosome analysis is also performed in the prenatal setting to determine whether a fetus is affected with aneuploidy or other chromosome rearrangements. Finally, chromosome abnormalities are often detected in cancer samples. A large number of different methods have been developed for chromosome analysis:

Basic metabolic studies

Biochemical studies are performed to screen for imbalances of metabolites in the bodily fluid, usually the blood (plasma/serum) or urine, but also in cerebrospinal fluid (CSF). Specific tests of enzyme function (either in leukocytes, skin fibroblasts, liver, or muscle) are also employed under certain circumstances. In the US, the newborn screen incorporates biochemical tests to screen for treatable conditions such as galactosemia and phenylketonuria (PKU). Patients suspected to have a metabolic condition might undergo the following tests:

Molecular studies

Treatments

Each cell of the body contains the hereditary information (DNA) wrapped up in structures called chromosomes. Since genetic syndromes are typically the result of alterations of the chromosomes or genes, there is no treatment currently available that can correct the genetic alterations in every cell of the body. Therefore, there is currently no "cure" for genetic disorders. However, for many genetic syndromes there is treatment available to manage the symptoms. In some cases, particularly inborn errors of metabolism, the mechanism of disease is well understood and offers the potential for dietary and medical management to prevent or reduce the long-term complications. In other cases, infusion therapy is used to replace the missing enzyme. Current research is actively seeking to use gene therapy or other new medications to treat specific genetic disorders.

Management of metabolic disorders

In general, metabolic disorders arise from enzyme deficiencies that disrupt normal metabolic pathways. For instance, in the hypothetical example:

    A ---> B ---> C ---> D         AAAA ---> BBBBBB ---> CCCCCCCCCC ---> (no D)
       X      Y      Z                   X           Y             (no Z)

Compound "A" is metabolized to "B" by enzyme "X", compound "B" is metabolized to "C" by enzyme "Y", and compound "C" is metabolized to "D" by enzyme "Z". If enzyme "Z" is missing, compound "D" will be missing, while compounds "A", "B", and "C" will build up. The pathogenesis of this particular condition could result from lack of compound "D", if it is critical for some cellular function, or from toxicity due to excess "A", "B", and/or "C". Treatment of the metabolic disorder could be achieved through dietary supplementation of compound "D" and dietary restriction of compounds "A", "B", and/or "C" or by treatment with a medication that promoted disposal of excess "A", "B", or "C". Another approach that can be taken is enzyme replacement therapy, in which a patient is given an infusion of the missing enzyme.

Dietary restriction and supplementation are key measures taken in several well-known metabolic disorders, including galactosemia, phenylketonuria (PKU), maple syrup urine disease, organic acidurias and urea cycle disorders. Such restrictive diets can be difficult for the patient and family to maintain, and require close consultation with a nutritionist who has special experience in metabolic disorders. The composition of the diet will change depending on the caloric needs of the growing child and special attention is needed during a pregnancy if a woman is affected with one of these disorders.

Medical approaches include enhancement of residual enzyme activity (in cases where the enzyme is made but is not functioning properly), inhibition of other enzymes in the biochemical pathway to prevent buildup of a toxic compound, or diversion of a toxic compound to another form that can be excreted. Examples include the use of high doses of pyridoxine (vitamin B6) in some patients with homocystinuria to boost the activity of the residual cystathione synthase enzyme, administration of biotin to restore activity of several enzymes affected by deficiency of biotinidase, treatment with NTBC in Tyrosinemia to inhibit the production of succinylacetone which causes liver toxicity, and the use of sodium benzoate to decrease ammonia build-up in urea cycle disorders.

Certain lysosomal storage diseases are treated with infusions of a recombinant enzyme (produced in a laboratory), which can reduce the accumulation of the compounds in various tissues. Examples include Gaucher disease, Fabry disease, Mucopolysaccharidoses and Glycogen storage disease type II. Such treatments are limited by the ability of the enzyme to reach the affected areas (the blood brain barrier prevents enzyme from reaching the brain, for example), and can sometimes be associated with allergic reactions. The long-term clinical effectiveness of enzyme replacement therapies vary widely among different disorders.

Other examples

Career paths and training

Geneticist working with a pedigree

There are a variety of career paths within the field of medical genetics, and naturally the training required for each area differs considerably. It should be noted that the information included in this section applies to the typical pathways in the United States and there may be differences in other countries. US Practitioners in clinical, counseling, or diagnostic subspecialties generally obtain board certification through the American Board of Medical Genetics.

Career Degree Description Training
Clinical Geneticist MD, DO, DO-PhD or MD-PhD A Clinical geneticist is typically a physician who evaluates patients in the office or as a hospital consultation. This process includes a medical history, family history (pedigree), a detailed physical examination, reviewing objective data such as imaging and test results, establishing a differential diagnosis, and recommending appropriate diagnostic tests. College (4 yrs) → Medical school (4 yrs) → Primary residency (2-3 yrs) → Residency in Clinical genetics (2 yrs). Some Clinical geneticists also obtain a PhD degree (4-7 yrs). A new residency track offers a 4 yr primary residency in Clinical genetics immediately after finishing Medical school.
Genetic Counselor MS A Genetic counselor specializes in communication of genetic information to patients and families. Genetic counselors often work closely with Clinical geneticists or other physicians (such as Obstetricians or Oncologists) and often convey the results of the recommended tests. College (4 yrs) → Graduate program in Genetic counseling (2 yrs).
Metabolic nurse and/or nutritionist BA/BS, MS, RN One of the critical aspects of the management of patients with metabolic disorders is the appropriate nutritional intervention (either restricting the compound that cannot be metabolized, or supplementing compounds that are deficient as the result of an enzyme deficiency). The metabolic nurse and nutritionist play important roles in coordinating the dietary management. College (4 yrs) → Nursing school or graduate training in nutrition.
Biochemical Diagnostics BSc, MSc, Ph.D., MD, DO, MD-PhD, or DO-PhD Individuals who specialize in Biochemical genetics typically work in the diagnostic laboratory, analyzing and interpreting specialized biochemical tests that measure amino acids, organic acids, and enzyme activity. Some Clinical Geneticists are also board certified in Biochemical Genetics. College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (MD/DO, 4 years)
Cytogenetic Diagnostics BSc, MSc, PhD, MD, DO, MD-PhD, or DO-PhD Individuals who specialize in Cytogenetics typically work in the diagnostic laboratory, analyzing and interpreting karyotypes, FISH, and comparative genomic hybridization tests. Some Clinical Geneticists are also board certified in Cytogenetics. College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (MD/DO, 4 years)
Molecular Genetics BSc, MSc, PhD, MD, DO, MD-PhD, or DO-PhD Individuals who specialize in Molecular genetics typically work in the diagnostic laboratory, analyzing and interpreting specialized genetic tests that look for disease-causing changes (mutations) in the DNA. Some examples of molecular diagnostic tests include DNA sequencing and Southern blotting. College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (MD/DO, 4 years)
Research Geneticist BSc, MSc, PhD, MD, DO, MD-PhD, or DO-PhD Any researcher who studies the genetic basis of human disease or uses model organisms to study disease mechanisms could be considered a Research Geneticist. Many of the clinical career paths also include basic or translational research, and thus individuals in the field of medical genetics often participate in some form of research. College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (MD/DO, 4 years) → Post-doctoral research training (usually 3+ years)
Laboratory Technician ASc, BSc or MSc Technicians in the diagnostic or research labs handle samples and run the assays at the bench. Often these individuals are promoted to supervisory positions. College (4 yrs), may have higher degree (MS, 2+ years)

Genetic information provides a unique type of knowledge about an individual and his/her family, fundamentally different from a typically laboratory test that provides a "snapshot" of an individual's health status. The unique status of genetic information and inherited disease has a number of ramifications with regard to ethical, legal, and societal concerns.

On 19 March 2015, scientists urged a worldwide ban on clinical use of methods, particularly the use of CRISPR and zinc finger, to edit the human genome in a way that can be inherited.[3][4][5][6] In April 2015 and April 2016, Chinese researchers reported results of basic research to edit the DNA of non-viable human embryos using CRISPR.[7][8][9] In February 2016, British scientists were given permission by regulators to genetically modify human embryos by using CRISPR and related techniques on condition that the embryos were destroyed within seven days.[10] In June 2016 the Dutch government was reported to be planning to follow suit with similar regulations which would specify a 14-day limit.[11]

Societies

The more empirical approach to human and medical genetics was formalized by the founding in 1948 of the American Society of Human Genetics. The Society first began annual meetings that year (1948) and its international counterpart, the International Congress of Human Genetics, has met every 5 years since its inception in 1956. The Society publishes the American Journal of Human Genetics on a monthly basis.

Medical genetics is now recognized as a distinct medical specialty in the U.S. with its own approved board (the American Board of Medical Genetics) and clinical specialty college (the American College of Medical Genetics). The College holds an annual scientific meeting, publishes a monthly journal, Genetics in Medicine, and issues position papers and clinical practice guidelines on a variety of topics relevant to human genetics.

Research

The broad range of research in medical genetics reflects the overall scope of this field, including basic research on genetic inheritance and the human genome, mechanisms of genetic and metabolic disorders, translational research on new treatment modalities, and the impact of genetic testing

Basic genetics research

Basic research geneticists usually undertake research in universities, biotechnology firms and research institutes.

Allelic architecture of disease

Sometimes the link between a disease and an unusual gene variant is more subtle. The genetic architecture of common diseases is an important factor in determining the extent to which patterns of genetic variation influence group differences in health outcomes.[12][13][14] According to the common disease/common variant hypothesis, common variants present in the ancestral population before the dispersal of modern humans from Africa play an important role in human diseases.[15] Genetic variants associated with Alzheimer disease, deep venous thrombosis, Crohn disease, and type 2 diabetes appear to adhere to this model.[16] However, the generality of the model has not yet been established and, in some cases, is in doubt.[13][17][18] Some diseases, such as many common cancers, appear not to be well described by the common disease/common variant model.[19]

Another possibility is that common diseases arise in part through the action of combinations of variants that are individually rare.[20][21] Most of the disease-associated alleles discovered to date have been rare, and rare variants are more likely than common variants to be differentially distributed among groups distinguished by ancestry.[19][22] However, groups could harbor different, though perhaps overlapping, sets of rare variants, which would reduce contrasts between groups in the incidence of the disease.

The number of variants contributing to a disease and the interactions among those variants also could influence the distribution of diseases among groups. The difficulty that has been encountered in finding contributory alleles for complex diseases and in replicating positive associations suggests that many complex diseases involve numerous variants rather than a moderate number of alleles, and the influence of any given variant may depend in critical ways on the genetic and environmental background.[17][23][24][25] If many alleles are required to increase susceptibility to a disease, the odds are low that the necessary combination of alleles would become concentrated in a particular group purely through drift.[26]

Population substructure in genetics research

One area in which population categories can be important considerations in genetics research is in controlling for confounding between population substructure, environmental exposures, and health outcomes. Association studies can produce spurious results if cases and controls have differing allele frequencies for genes that are not related to the disease being studied,[27] although the magnitude of this problem in genetic association studies is subject to debate.[28][29] Various methods have been developed to detect and account for population substructure,[30][31] but these methods can be difficult to apply in practice.[32]

Population substructure also can be used to advantage in genetic association studies. For example, populations that represent recent mixtures of geographically separated ancestral groups can exhibit longer-range linkage disequilibrium between susceptibility alleles and genetic markers than is the case for other populations.[33][34][35][36] Genetic studies can use this admixture linkage disequilibrium to search for disease alleles with fewer markers than would be needed otherwise. Association studies also can take advantage of the contrasting experiences of racial or ethnic groups, including migrant groups, to search for interactions between particular alleles and environmental factors that might influence health.[37][38]

Textbooks and journals

See also

References

  1. ↑ http://abmgg.org/
  2. ↑ http://abmgg.org/pages/training_options.shtml
  3. ↑ Wade, Nicholas (19 March 2015). "Scientists Seek Ban on Method of Editing the Human Genome". New York Times. Retrieved 20 March 2015.
  4. ↑ Pollack, Andrew (3 March 2015). "A Powerful New Way to Edit DNA". New York Times. Retrieved 20 March 2015.
  5. ↑ Baltimore, David; Berg, Paul; Botchan, Dana; Charo, R. Alta; Church, George; Corn, Jacob E.; Daley, George Q.; Doudna, Jennifer A.; Fenner, Marsha; Greely, Henry T.; Jinek, Martin; Martin, G. Steven; Penhoet, Edward; Puck, Jennifer; Sternberg, Samuel H.; Weissman, Jonathan S.; Yamamoto, Keith R. (19 March 2015). "A prudent path forward for genomic engineering and germline gene modification". Science. 348: 36–8. PMC 4394183 Freely accessible. PMID 25791083. doi:10.1126/science.aab1028. Retrieved 20 March 2015.
  6. ↑ Lanphier, Edward; Urnov, Fyodor; Haecker, Sarah Ehlen; Werner, Michael; Smolenski, Joanna (26 March 2015). "Don’t edit the human germ line". Nature. 519: 410–411. PMID 25810189. doi:10.1038/519410a. Retrieved 20 March 2015.
  7. ↑ Kolata, Gina (23 April 2015). "Chinese Scientists Edit Genes of Human Embryos, Raising Concerns". New York Times. Retrieved 24 April 2015.
  8. ↑ Liang, Puping; Xu, Yanwen; Zhang, Xiya; Ding, Chenhui; Huang, Rui; Zhang, Zhen; Lv, Jie; Xie, Xiaowei; Chen, Yuxi; Li, Yujing; Sun, Ying; Bai, Yaofu; Songyang, Zhou; Ma, Wenbin; Zhou, Canquan; Huang, Junjiu (18 April 2015). "CRISPR/Cas9-mediated gene editing in human tripronuclear zygotes". Protein & Cell. 6: 363–72. PMC 4417674 Freely accessible. PMID 25894090. doi:10.1007/s13238-015-0153-5. Retrieved 24 April 2015.
  9. ↑ Regalado, Antonio (2016-05-08). "Chinese Researchers Experiment with Making HIV-Proof Embryos". MIT Technology Review. Retrieved 2016-06-10.
  10. ↑ Gallagher, James (1 February 2016). "Scientists get 'gene editing' go-ahead". BBC News. BBC. Retrieved 10 June 2016.
  11. ↑ Amjad, Anneesa (2016-06-06). "Dutch government seeks to allow creation of human embryos for research". BioNews. Retrieved 2016-06-10.
  12. ↑ Reich DA, Lander ES (2001). "On the allelic spectrum of human disease". Trends Genet. 17: 502–510. doi:10.1016/s0168-9525(01)02410-6.
  13. 1 2 Pritchard JK (2002). "The allelic architecture of human disease genes: common disease-common variant...or not?". Hum Mol Genet. 11: 2417–2423. doi:10.1093/hmg/11.20.2417.
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  15. ↑ Goldstein DB, Chikhi L (2002). "Human migrations and population structure: what we know and why it matters". Annu Rev Genom Hum Genet. 3: 129–152. PMID 12142358. doi:10.1146/annurev.genom.3.022502.103200.
  16. ↑ Lohmueller KE, Pearce CL, Pike M, Lander ES, Hirschhorn JN (2003). "Meta-analysis of genetic association studies supports a contribution of common variants to susceptibility to common disease". Nat Genet. 33: 177–182. PMID 12524541. doi:10.1038/ng1071.
  17. 1 2 Weiss KM, Terwilliger JD (2000). "How many diseases does it take to map a gene with SNPs?". Nat Genet. 26: 151–157. PMID 11017069. doi:10.1038/79866.
  18. ↑ Cardon LR, Abecasis GR (2003). "Using haplotype blocks to map human complex trait loci". Trends Genet. 19: 135–140. PMID 12615007. doi:10.1016/s0168-9525(03)00022-2.
  19. 1 2 Kittles RA, Weiss KM (2003). "Race, ancestry, and genes: implications for defining disease risk". Annu Rev Genomics Hum Genet. 4: 33–67. PMID 14527296. doi:10.1146/annurev.genom.4.070802.110356.
  20. ↑ Pritchard JK (2001). "Are rare variants responsible for susceptibility to complex diseases?". Am J Hum Genet. 69: 124–137. doi:10.1086/321272.
  21. ↑ Cohen JC, Kiss RS, Pertsemlidis A, Marcel YL, McPherson R, Hobbs HH (2004). "Multiple rare alleles contribute to low plasma levels of HDL cholesterol". Science. 305: 869–872. PMID 15297675. doi:10.1126/science.1099870.
  22. ↑ Risch N, Burchard E, Ziv E, Tang H, "Categorization of humans in biomedical research: genes, race and disease," Genome Biol (2002) 3 (http://genomebiology.com/2002/3/7/comment/2007) (electronically published July 1, 2002; accessed August 25, 2005)
  23. ↑ Risch N (2000). "Searching for the genetic determinants in a new millennium". Nature. 405: 847–856. PMID 10866211. doi:10.1038/35015718.
  24. ↑ Altmüller J, Palmer LJ, Fischer G, Scherb H, Wjst M (2001). "Genomewide scans of complex human diseases: true linkage is hard to find". Am J Hum Genet. 69: 936–950. PMC 1274370 Freely accessible. PMID 11565063. doi:10.1086/324069.
  25. ↑ Hirschhorn JN, Lohmueller K, Byrne E, Hirschhorn K (2002). "A comprehensive review of genetic association studies". Genet Med. 4: 45–61. doi:10.1097/00125817-200203000-00002.
  26. ↑ Cooper RS, "Genetic factors in ethnic disparities in health," in Anderson NB, Bulatao RA, Cohen B, eds., Critical perspectives on racial and ethnic differences in health in later life, (Washington DC: National Academy Press, 2004), 267–309.
  27. ↑ Cardon LR, Palmer LJ (2003). "Population stratification and spurious allelic association". Lancet. 361: 598–604. PMID 12598158. doi:10.1016/s0140-6736(03)12520-2.; Marchini J, Cardon LR, Phillips MS, Donnelly P (2004). "The effects of human population structure on large genetic association studies". Nat Genet. 36: 512–517. PMID 15052271. doi:10.1038/ng1337.
  28. ↑ Thomas DC, Witte JS (2002). "Point: population stratification: a problem for case-control studies of candidate-gene associations?". Cancer Epidemiol Biomarkers Prev. 11: 505–512.
  29. ↑ Wacholder S, Rothman N, Caporaso N (2002). "Counterpoint: bias from population stratification is not a major threat to the validity of conclusions from epidemiological studies of common polymorphisms and cancer". Cancer Epidemiol Biomarkers Prev. 11: 513–520.
  30. ↑ Morton NE, Collins A (1998). "Tests and estimates of allelic association in complex inheritance". Proc Natl Acad Sci USA. 95: 11389–11393. PMC 21652 Freely accessible. PMID 9736746. doi:10.1073/pnas.95.19.11389.
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  32. ↑ Freedman ML, Reich D, Penney KL, McDonald GJ, Mignault AA, Patterson N, Gabriel SB, Topol EJ, Smoller JW, Pato CN, Pato MT, Petryshen TL, Kolonel LN, Lander ES, Sklar P, Henderson B, Hirschhorn JN, Altshuler D (2004). "Assessing the impact of population stratification on genetic association studies". Nat Genet. 36: 388–393. PMID 15052270. doi:10.1038/ng1333.
  33. ↑ Hoggart CJ, Shriver MD, Kittles RA, Clayton DG, McKeigue PM (2004). "Design and analysis of admixture mapping studies". Am J Hum Genet. 74: 965–978. PMC 1181989 Freely accessible. PMID 15088268. doi:10.1086/420855.
  34. ↑ Patterson N, Hattangadi N, Lane B, Lohmueller KE, Hafler DA, Oksenberg JR, Hauser SL, Smith MW, O'Brien SJ, Altshuler D, Daly MJ, Reich D (2004). "Methods for high-density admixture mapping of disease genes". Am J Hum Genet. 74: 979–1000. PMC 1181990 Freely accessible. PMID 15088269. doi:10.1086/420871.
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