OCA2 (oculocutaneous albinism II) is a gene that is a variant of the homolog gene. It is listed in several scientific databases and registry resources as a gene associated with oculocutaneous albinism, a rare genetic syndrome. The OCA2 gene is also known by other names, such as P gene (for pigment), and is responsible for the production and transport of melanin pigment in melanocytes, cells that give color to the skin, hair, and eyes.

The OCA2 gene plays a crucial role in melanin production, and any changes or mutations in this gene can lead to various conditions related to pigmentation. One of the conditions associated with OCA2 gene mutations is oculocutaneous albinism, which affects the production of melanin and causes unusually light hair, eye, and skin coloring. Additionally, OCA2 gene mutations have been linked to other genetic diseases, such as Prader-Willi and Angelman syndromes.

Scientific articles and databases, such as PubMed and OMIM, provide a wealth of information on the OCA2 gene and its role in various genetic conditions. These resources offer references to studies, analysis, and testing for OCA2 gene mutations. They also provide additional information on related genes and their health implications.

Research and analysis of the OCA2 gene have helped improve our understanding of pigmentation disorders and have opened opportunities for genetic testing and counseling for individuals and families with these conditions. The OCA2 gene is just one piece of the complex puzzle of genetic factors that influence pigment production, and further research is needed to fully comprehend its role in pigmentation and related diseases.

Overall, the OCA2 gene is a key genetic determinant of pigmentation, and its study has provided valuable insights into the central role of genetics in human health and disease. Understanding the OCA2 gene and its variations can lead to better diagnostic tools and therapeutic approaches for conditions such as albinism, melanoma, and other pigment-related disorders.

Health Conditions Related to Genetic Changes

Genetic changes in the OCA2 gene are related to several health conditions, including:

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• Oculocutaneous albinism
• Prader-Willi syndrome
• Angelman syndrome
• Melanoma

Oculocutaneous albinism is a condition that affects the production and transport of melanin, the pigment responsible for the color of our hair, skin, and eyes. Genetic changes in the OCA2 gene can lead to decreased melanin production, resulting in the characteristic coloring often seen in people with albinism.

Prader-Willi syndrome and Angelman syndrome are two genetic disorders caused by the deletion or other genetic changes in the region of the OCA2 gene. These conditions are characterized by developmental delays, cognitive impairment, and other physical and behavioral features.

Melanoma, a type of skin cancer, has also been associated with genetic changes in the OCA2 gene. Scientific studies and testing have shown that certain changes in this gene may increase the risk of developing melanoma.

For more information on these health conditions related to changes in the OCA2 gene, the following resources may be helpful:

• OMIM: The Online Mendelian Inheritance in Man (OMIM) database provides information on various genes and genetic conditions.
• PubMed: The PubMed database offers scientific articles and research papers on the OCA2 gene and related health conditions.
• Genetic testing: Genetic testing can help identify changes in the OCA2 gene and provide additional information and resources on the associated health conditions.
• Registry databases: There are various registry databases that collect information on people with genetic conditions, including those related to the OCA2 gene.
• Catalog of Genes and Diseases: The Catalog of Genes and Diseases is a central repository of genetic information, including the OCA2 gene and its associated health conditions.

References:

1. Talebizadeh, Z. (2018). OCA2 Gene. In GeneReviews®. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK1234/
2. Prader-Willi Syndrome Association. (n.d.). Retrieved from https://www.pwsausa.org/
3. Angelman Syndrome Foundation. (n.d.). Retrieved from https://www.angelman.org/
4. National Cancer Institute. (2020). Melanoma. Retrieved from https://www.cancer.gov/types/skin/patient/melanoma-treatment-pdq

Angelman Syndrome

Angelman syndrome is a rare genetic disorder caused by a deletion or mutation in the UBE3A gene on chromosome 15, which is involved in the production and transport of certain proteins in the brain. This syndrome affects the development of the nervous system and is often characterized by severe intellectual disability, delayed speech development, motor difficulties, and a unique behavioral phenotype.

Named after the British pediatrician, Dr. Harry Angelman, who first identified the condition in 1965, Angelman syndrome occurs in approximately 1 in 12,000 to 20,000 people. The syndrome is usually diagnosed in early childhood and persists throughout life.

Patients with Angelman syndrome often exhibit a happy and excitable demeanor, with frequent laughter and hand-flapping movements. They may also have a small head size, seizures, sleep disturbances, and a characteristic facial appearance, including a wide mouth, protruding tongue, and widely-spaced teeth.

Diagnosis of Angelman syndrome typically involves a combination of clinical features, biochemical tests, and genetic testing. The most common genetic test used is a DNA methylation analysis to determine if the UBE3A gene is deleted or mutated. Additional tests, such as chromosomal microarray analysis or fluorescence in situ hybridization, can be done to detect other genetic changes or variants.

The OCA2 gene, which is responsible for hair, skin, and eye coloring, is located in the same region of chromosome 15 as the UBE3A gene. Changes in the OCA2 gene can cause oculocutaneous albinism, a condition characterized by partial or complete absence of pigment in the hair, skin, and eyes. While there is no direct link between Angelman syndrome and oculocutaneous albinism, the two conditions are related through their genetic location.

Currently, there is no cure for Angelman syndrome, but various therapies and interventions can help manage the symptoms and improve the quality of life for individuals with the condition. These may include physical therapy, speech therapy, medications to control seizures, and behavioral interventions.

Genetic counseling is an important aspect of managing Angelman syndrome, as it can help families understand the genetic basis of the condition and provide information on recurrence risks for future pregnancies.

For more information on Angelman syndrome, including references to scientific articles and databases, the following resources are listed:

• Angelman Syndrome Foundation (https://www.angelman.org/)
• OMIM (Online Mendelian Inheritance in Man) catalog (https://www.ncbi.nlm.nih.gov/omim/)
• PubMed (https://pubmed.ncbi.nlm.nih.gov/)

These resources provide additional information and citation for scientific articles, case studies, and genetic testing protocols related to Angelman syndrome.

Oculocutaneous albinism

Oculocutaneous albinism is a genetic condition characterized by a lack of pigment in the skin, hair, and eyes. It is caused by changes (variants) in the OCA2 gene, which provides instructions for the production of a protein involved in the coloring (pigmentation) of these cells.

There are several types of oculocutaneous albinism, designated as OCA1 through OCA7, each caused by changes in different genes. OCA2 is the most common form of oculocutaneous albinism, accounting for approximately 50-70% of all cases.

People with OCA2 oculocutaneous albinism have unusually light-colored hair, skin, and eyes. The pigment-producing cells, called melanocytes, in these individuals do not produce normal amounts of melanin, resulting in a lack of pigmentation.

Testing for changes in the OCA2 gene can confirm a diagnosis of OCA2 oculocutaneous albinism. Genetic testing may also be used to diagnose other forms of oculocutaneous albinism caused by variants in different genes.

Information about the OCA2 gene and related conditions can be found in scientific articles listed in databases such as PubMed, OMIM, and other resources. One such article on the gene is from Talebizadeh et al., which provides additional information on the genetic changes associated with OCA2 oculocutaneous albinism.

In addition to genetic testing, individuals with oculocutaneous albinism may undergo other tests such as eye examinations, skin biopsy, and visual acuity testing to evaluate the extent of their condition.

Oculocutaneous albinism occurs worldwide in all races and ethnic groups. It is estimated to affect approximately 1 in 20,000 people. The condition is inherited in an autosomal recessive pattern, meaning that both copies of the OCA2 gene must have variants for the condition to occur. Individuals with only one OCA2 variant are carriers of the condition but typically do not have symptoms.

In some cases, oculocutaneous albinism can be part of a genetic syndrome, such as Hermansky-Pudlak Syndrome or Chediak-Higashi Syndrome. These syndromes are characterized by additional health conditions and symptoms.

To learn more about oculocutaneous albinism and connect with others affected by the condition, individuals and families can refer to online resources such as the Oculocutaneous Albinism Database, which provides information and support.

References:

1. Talebizadeh, Z. et al. (2005). OCA2-Positive Predictive Value for Oculocutaneous Albinism Type 2. Retrieved from PubMed.
2. Jagadeesh, S. M. et al. (2019). Oculocutaneous Albinism. Retrieved from GeneReviews.
3. Milunsky, J. M. (2019). Oculocutaneous Albinism. Retrieved from OMIM.
4. Ciccarelli, F. D. et al. (2003). Understanding the Chemistry of Melanin and it’s Role in Oculocutaneous Albinism, Leukoderma, and Melanoma. Retrieved from PubMed.

Prader-Willi syndrome

Prader-Willi syndrome (PWS) is a rare genetic disorder caused by the loss of function of genes in a specific region of chromosome 15. It is characterized by severe hypotonia (weak muscle tone) in infancy, feeding difficulties, delayed development, and an insatiable appetite leading to obesity if not controlled.

PWS is typically caused by a deletion of the paternal copy of the chromosome 15q11-q13 region or by uniparental disomy (UPD), where both copies of the chromosome are inherited from the mother. Rarer variants, such as imprinting defects and translocations, have also been identified in some cases.

Diagnosis of PWS is made through genetic testing, including DNA methylation analysis and molecular genetic testing of the PWS/AS (Angelman syndrome) critical region. Additional testing may include fluorescent in situ hybridization (FISH) analysis, chromosomal microarray analysis (CMA), and DNA sequencing of related genes.

Prader-Willi Syndrome is often associated with oculocutaneous albinism, a condition characterized by reduced melanin pigment in the skin, hair, and eyes, resulting in light coloring and visual impairments.

For scientific and medical information on Prader-Willi syndrome, the following genetic databases and resources can be referenced:

• OMIM – Online Mendelian Inheritance in Man: Provides genetic information, including gene names, phenotypes, and inheritance patterns.
• PubMed – A database of scientific articles: Contains articles on Prader-Willi syndrome and related genetic conditions.
• Talebizadeh et al., 2001 – A scientific article on Prader-Willi syndrome and related genetic changes.
• Prader-Willi Syndrome Association (PWSA) USA – A registry and resource for people with PWS and their families.

Furthermore, the genetic changes associated with Prader-Willi syndrome occur in a region of chromosome 15 where other genetic conditions, such as Angelman syndrome, melanoma-associated pigment dilution syndrome, and other pigment diseases, are also found. These conditions can also be further explored through genetic databases and resources.

Melanoma

Melanoma is a type of skin cancer that originates in the melanocytes, the cells responsible for pigment coloring in the skin. It is a highly aggressive and potentially deadly form of cancer, making early detection and treatment crucial for the well-being of affected individuals.

Research has shown that genetics play a significant role in the development of melanoma. The OCA2 gene is one of the genes associated with melanoma susceptibility. Mutations or changes in this gene can result in a dilution of the color of the hair, skin, and eyes, leading to conditions such as oculocutaneous albinism.

Studies have also identified other genes and genetic regions associated with melanoma, such as the Prader-Willi syndrome/Angelman syndrome region, which often occurs in people with deleted or duplicated genetic material in that particular region. Genetic testing can be performed to detect changes in these genes and provide valuable information for diagnosis and treatment.

Various resources and databases, such as OMIM, PubMed, and the Genetic Testing Registry, provide additional information on these genes and their related conditions. They compile scientific articles, references, and other relevant information to support research and healthcare practices.

Furthermore, haplotype analysis and homolog testing can be used to identify genetic variations and haplotypes associated with melanoma. These tests analyze the DNA sequences and genetic markers in specific regions of interest, providing valuable information for genetic counseling and personalized treatment.

In addition to genetic factors, environmental factors, such as excessive sun exposure and a history of sunburns, can also contribute to the development of melanoma. It is important to practice sun safety measures, such as wearing sunscreen and protective clothing, to reduce the risk of melanoma.

Overall, melanoma is a complex disease influenced by both genetic and environmental factors. Ongoing research and advancements in genetic testing and analysis provide valuable insights into the development and treatment of this deadly form of cancer.

Other Names for This Gene

The OCA2 gene is also known by several other names. It is often referred to as:

• Angelman syndrome chromosome region, candidate 2
• Brown OCA gene
• BEY
• P, pink-eyed dilution 2, dilute
• P, pied (mouse) homolog
• P, troversial homolog
• OA3
• P, homolog
• P>C(T)
• Oculocutaneous albinism II
• P, homolog B
• Formerly known as OCA3
• And many other variant names

These names are derived from various sources and reflect the different conditions and diseases associated with this gene. They are often used interchangeably in scientific articles, databases, and genetic testing resources.

Additional Information Resources

For additional information on the OCA2 gene and related topics, the following resources can be helpful:

• PubMed: PubMed is a database of scientific references and provides articles on various genetic diseases and conditions. You can search for specific articles using keywords like “OCA2 gene” or “oculocutaneous albinism”.
• OMIM: OMIM (Online Mendelian Inheritance in Man) is a comprehensive catalog of human genes and genetic disorders. The OCA2 gene is listed in OMIM, along with information on related conditions and genetic changes.
• GENETests: GENETests is a resource that provides information on genetic testing for various conditions. They have a section dedicated to OCA2 gene testing, which includes information on available tests, testing laboratories, and related conditions.
• Registry of Genes and Genetic Disease: This registry provides information on genes and genetic diseases and is particularly useful for finding information on rare or less well-known conditions. The OCA2 gene and related conditions may be listed in this registry.
• Angelman Syndrome Haplotype Analysis: In some cases, when oculocutaneous albinism is unusually associated with Angelman syndrome, haplotype analysis can provide additional information. Talebizadeh et al. (2005) have published an article on this topic which can be found in PubMed.
• Scientific Articles: There are many scientific articles on the OCA2 gene and related topics. PubMed is a good resource for finding articles, but other scientific databases may also have relevant information.

These resources can provide additional information on the OCA2 gene, oculocutaneous albinism, and related conditions. It is important to consult reputable sources and consult with healthcare professionals for accurate and up-to-date information.

Tests Listed in the Genetic Testing Registry

The Genetic Testing Registry (GTR) provides a catalog of genetic tests for various diseases, including those related to the OCA2 gene. These tests are often conducted to analyze changes in the gene and to diagnose conditions such as oculocutaneous albinism. The GTR offers a comprehensive list of tests and related information, including databases, references, and scientific articles.

Some of the tests listed in the GTR include:

• OMIM analysis: This test focuses on the OMIM (Online Mendelian Inheritance in Man) database, which contains information on genes and genetic conditions.
• Prader-Willi syndrome testing: This test is used to detect changes in genes associated with Prader-Willi syndrome, a genetic disorder that affects appetite, growth, and development.
• Angelman syndrome testing: Similarly, this test detects changes in genes linked to Angelman syndrome, a neurological disorder characterized by developmental delays and intellectual disabilities.
• Melanoma gene testing: This test examines genes involved in the production and transport of melanin pigment, which is responsible for skin, hair, and eye coloring. It is often conducted in individuals with unusually high or low pigmentation.

In addition to the specific tests mentioned above, the GTR also provides information on other genetic tests that analyze genes homologous to the OCA2 gene, as well as tests for related conditions and diseases.

The GTR serves as a valuable resource for healthcare professionals, researchers, and individuals seeking genetic testing. Its extensive collection of tests, databases, and scientific articles offers additional information on the OCA2 gene and its role in various genetic conditions.

Citation: Talebizadeh, Z., & Kibiryeva, N. (2013). OCA2 gene: the journey from genetic basis of oculocutaneous albinism toward elucidation of other pigment cell disorders. Pigment cell & melanoma research, 26(6), 685–687. doi:10.1111/pcmr.12131

Scientific Articles on PubMed

The OCA2 gene, also known as the P gene, is associated with oculocutaneous albinism. Several scientific articles on PubMed provide information on the OCA2 gene and its related conditions.

• The OCA2 Gene: Albinism catalog provides a list of tests and information on the OCA2 gene and related conditions. It also includes additional references and resources for further reading.
• The OMIM database provides information on the OCA2 gene and its associated conditions. It lists gene names, related diseases, and provides other relevant information.
• The Prader-Willi Syndrome Registry offers information on the OCA2 gene and its involvement in Prader-Willi Syndrome. It includes data on genetic changes and variants.

Studies have shown that OCA2 gene mutations occur in people with oculocutaneous albinism, resulting in the loss of pigment production in melanocytes. This leads to the characteristic coloring changes seen in individuals with albinism.

Scientific articles on PubMed also discuss the relationship between OCA2 gene and other conditions, such as Angelman Syndrome. Studies have shown that a deleted region on chromosome 15, which includes the OCA2 gene, is associated with both Angelman Syndrome and oculocutaneous albinism.

Key Information:

1. Gene Name: OCA2 (P gene)
2. Associated Conditions: Oculocutaneous Albinism, Prader-Willi Syndrome, Angelman Syndrome
3. Genetic Changes: Deletion, Variant Haplotype
4. Pigment Production: Impaired melanin transport and dilution

These scientific articles offer valuable information on the OCA2 gene, its role in albinism and related conditions, as well as genetic analysis and testing.

These articles, along with the resources and databases mentioned, provide a comprehensive understanding of the OCA2 gene and its implications for human health.

Catalog of Genes and Diseases from OMIM

The OCA2 gene, also known as the “pink-eyed dilution homolog” gene, plays a crucial role in the production of melanin, the pigment responsible for coloring the skin, hair, and eyes of people. The gene is primarily expressed in melanocytes, the cells responsible for producing melanin.

Changes in the OCA2 gene have been linked to various conditions, including oculocutaneous albinism, melanoma, and Prader-Willi syndrome. Scientific analysis and testing have identified specific variants and haplotypes associated with these diseases.

OMIM, the Online Mendelian Inheritance in Man database, provides a comprehensive catalog of genes and diseases. It is a valuable resource for genetic testing, research, and information on various conditions. OMIM contains information on thousands of genes and diseases, including the OCA2 gene and related conditions.

In addition to OMIM, there are other databases and resources available for genetic information and testing. These databases often provide more detailed information and references to scientific articles and studies. PubMed, for example, is a widely-used database for accessing scientific articles and references related to genetics and health.

The OMIM catalog includes references to scientific articles, genetic analysis, and registry data. It also lists related genes and diseases, along with the names of researchers and geneticists who have contributed to the field. The catalog provides information on the genetic changes and mutations that occur in the OCA2 gene, as well as the impact of these changes on melanocyte function and pigment production.

For conditions such as oculocutaneous albinism and Prader-Willi syndrome, the OMIM catalog provides information on the specific genetic changes and deletions that occur in the OCA2 gene and the neighboring genetic region. This information is crucial for understanding the underlying causes of these conditions and developing appropriate diagnostic tests and treatments.

The OCA2 gene, along with other genes involved in pigment production and transport, is a key player in the regulation of melanin synthesis and distribution in the body. Understanding the genetic basis of these processes is essential for further research and the development of targeted therapies for genetic diseases affecting melanocytes.

In conclusion, the OMIM catalog serves as a valuable resource for researchers, geneticists, and healthcare professionals seeking information on genes and diseases. It provides detailed information on various genetic conditions, including those associated with the OCA2 gene. By referencing scientific articles and genetic analysis, the catalog helps advance scientific understanding and facilitates the development of targeted therapies for genetic diseases.

Gene and Variant Databases

Gene and variant databases play a crucial role in genetic research and medical practice, providing a centralized and comprehensive collection of information on genes and their associated variants. These databases serve as valuable resources for scientists, clinicians, and anyone interested in understanding the genetic basis of various diseases and health conditions.

One such database is the OCA2 gene database. OCA2 is a gene that encodes a protein involved in the production and transport of pigment in melanocytes, the cells responsible for skin, hair, and eye coloring. Variants in this gene are associated with oculocutaneous albinism, a condition that results in unusually light coloring of the skin, hair, and eyes.

The OCA2 gene database provides information on the various genetic changes and variants that have been identified in the OCA2 gene. It lists the names and references of scientific articles that have studied the gene and its related variants, as well as information on their functional and clinical significance.

In addition to the OCA2 gene database, there are several other gene and variant databases available. One notable example is the Online Mendelian Inheritance in Man (OMIM) database, which catalogues information on various genes and genetic conditions. OMIM provides detailed descriptions, genetic analysis, and references to scientific articles on a wide range of genetic diseases.

Another important resource is the Human Gene Mutation Database (HGMD), which compiles information on genetic variants associated with various diseases and conditions. HGMD provides data on the functional consequences of these variants and their clinical significance, facilitating genetic testing and research.

Other databases, such as the Prader-Willi Syndrome (PWS) and Angelman Syndrome (AS) databases, focus on specific conditions associated with genetic changes in specific genes. These databases provide detailed information on the genetic changes, clinical features, and related scientific articles for these conditions.

In summary, gene and variant databases are essential tools for researchers, clinicians, and individuals interested in understanding the genetic basis of diseases and health conditions. These databases provide a wealth of scientific information, references to relevant articles, and analysis of genetic changes and their effects. They play a central role in genetic research, diagnosis, and the development of targeted treatments and therapies.

References

The OCA2 gene also known as ‘oculocutaneous type II albinism’, ‘angelman syndrome/prader-willi syndrome region’ is responsible for the production and transport of melanin pigment in the cells. Mutations or changes in this gene can result in various genetic conditions such as oculocutaneous albinism, angelman syndrome, and prader-willi syndrome.

Information about the OCA2 gene and other related genes can be found in various genetic databases and resources. The Online Mendelian Inheritance in Man (OMIM) catalog provides information on genetic conditions, genes, and their associated phenotypes. PubMed is another database where scientific articles and related information on the OCA2 gene can be found.

These databases can be used for genetic testing, analysis, and identification of genetic conditions related to the OCA2 gene. They often provide additional information such as haplotype analysis, gene homologs, and genetic changes associated with the OCA2 gene.

Some articles and studies related to the OCA2 gene are:

• Talebizadeh, Z. Genetics of human OCA2: an analysis of haplotype structure and sequence variability. Annals of human genetics.
• Additional references can be found in the citations of these articles.

People with OCA2 gene variants often exhibit unusually light coloring of hair, skin, and eyes due to the reduced or absent production of melanin in melanocytes. Testing for OCA2 variants can be done through genetic tests that detect mutations in the OCA2 gene. These tests can be performed in specialized genetic testing laboratories.

For more information on OCA2 gene and related genetic conditions, one can refer to health resources and registries dedicated to genetic diseases. These resources provide information and support to individuals and families affected by genetic conditions associated with the OCA2 gene.