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What is monogenic disease?

Author

Chloe Ramirez

Updated on March 05, 2026

What is monogenic disease?

Monogenic disorders (monogenic traits) are disorders caused by variation in a single gene and are typically recognized by their striking familial inheritance patterns. Examples include sickle cell anemia, cystic fibrosis, Huntington disease, and Duchenne muscular dystrophy.

Moreover, what does a monogenic disease mean?

Monogenic diseases (table 1) are rare diseases attributable to genetic variants with large effects on disease status. Because of the high penetrance of such variants, the disease is typically inherited in a classical Mendelian fashion (e.g. dominant or recessive).

One may also ask, how do you identify a monogenic disease? Monogenic disorders, such as FHM, are caused by single mutations in a specific (set of) gene(s). A typical approach to identify such genes is linkage analysis, which analyzes the segregation of specific genetic markers with the disease phenotype, resulting in a specific chromosomal position for the disease gene.

Beside this, how many monogenic diseases are there?

There are 5,000–8,000 monogenic diseases, defined as inherited conditions arising from mutations on a single gene. These often manifest during childhood and lead to morbidity and sometimes premature death.

What are the three categories of monogenic diseases?

Classifications of Monogenic Diseases

  • Autosomal Dominant.
  • Autosomal Recessive.
  • X-Linked.

What is the most common monogenic disease?

Familial Hypercholesterolemia: The Most Common Monogenic Disorder in Humans. .

What is the most rare syndrome?

Five rare diseases you never knew existed
  1. Stoneman Syndrome. Frequency: one in two million people.
  2. Alice In Wonderland Syndrome (AIWS) Frequency: currently unknown.
  3. Hutchinson-Gilford Progeria Syndrome (HGPS) Frequency: one in four million.
  4. Alkaptonuria.
  5. Chronic Focal Encephalitis (Rasmussen's Encephalitis)

Are all monogenic diseases rare?

Trends in Gene Discovery

For one, many of the 1,621 monogenic disorders without known genes are very rare. As a result, researchers face difficulties in identifying families with the disease and in obtaining sufficient numbers of DNA samples for comparison to unaffected family members.

What is monogenic inheritance?

Monogenic inheritance refers to the inheritance that is controlled by the alleles for one particular locus, as opposed to di- tri- or polygenic control exerted by two three or many non-allelic genes.

How is monogenic diabetes treated?

Some monogenic forms of diabetes can be treated with oral diabetes medicines (pills), while other forms require insulin injections. A correct diagnosis allows for proper treatment and can lead to better glucose control and improved health in the long term.

What are 5 genetic diseases?

What You Need to Know About 5 Most Common Genetic Disorders
  • Down Syndrome.
  • Thalassemia.
  • Cystic Fibrosis.
  • Tay-Sachs disease.
  • Sickle Cell Anemia.
  • Learn More.
  • Recommended.
  • Sources.

Is height a monogenic trait?

Height is a classic polygenic quantitative trait with a high level of heritability. As it is a simple and stable parameter to measure, height is a model for both common, complex disorders and monogenic, Mendelian disease.

Is blood type monogenic?

Monogenetic traits are single gene traits. One gene controls the expression of a specific structure, protein or function. An example is one woman's single gene trait for blood type. The blood type gene is located on chromosome 9 (locus is 9q34).

Can a person's DNA be changed?

The study uses CRISPR technology, which can alter DNA.

Researchers from the OHSU Casey Eye Institute in Portland, Oregon, have broken new ground in science, medicine, and surgery — the first gene editing procedure in a living person. For the first time, scientists are altering DNA in a living human.

How many genes do humans have?

An international research effort called the Human Genome Project, which worked to determine the sequence of the human genome and identify the genes that it contains, estimated that humans have between 20,000 and 25,000 genes.

How many single gene disorders are there?

What are single gene disorders? Single gene disorders are caused by defects in one particular gene. There are over 10,000 human disorders caused by a change, known as a mutation, in a single gene.

How many human genetic disorders are known?

Sometimes called Mendelian disorders, scientists believe that there are currently about 4,000 disorders caused from single gene defects.

What disorders are inherited?

Genetic disorders
  • Albinism. Albinism is a group of genetic conditions.
  • Angelman syndrome. A rare syndrome causing physical and intellectual disability.
  • Ankylosing spondylitis.
  • Apert syndrome.
  • Charcot-Marie-Tooth disease.
  • Congenital adrenal hyperplasia.
  • Cystic fibrosis (CF)
  • Down syndrome.

What is Digenic?

biology. : induced by two genes —used of phenotypic effects manifested only when two nonallelic controlling genes interact.

Are monogenic diseases inherited?

Monogenic disorders are caused by the inheritance of single gene mutations; alternatively, a monogenic disorder arises as a consequence of a de novo mutation in either the paternal or maternal germ line.

What are Mendelian disorders in humans?

Examples of Mendelian Disorders in Humans
  • Sickle cell anemia.
  • Thalassemia.
  • Cystic fibrosis.
  • Colour blindness.
  • Haemophilia.
  • Skeletal dysplasia.
  • Muscular dystrophy.
  • Phenylketonuria.

Are chromosomal abnormalities common?

Chromosomal abnormalities are common causes of birth defects that can affect the brain and other parts of the body. The normal fertilized egg cell contains 23 chromosomes from the mother and 23 from the father. Thus, there are normally 23 pairs of chromosomes in the fertilized egg.

What are examples of single gene disorders?

Some of the more common single-gene disorders include cystic fibrosis, hemochromatosis, Tay-Sachs, and sickle cell anemia. Even though these diseases are primarily caused by a single gene, several different mutations can result in the same disease but with varying degrees of severity and phenotype.

Is albinism a monogenic trait?

The term albinism typically refers to oculocutaneous (ok-u-low-ku-TAY-nee-us) albinism (OCA) — a group of inherited disorders where there is little or no production of the pigment melanin. The type and amount of melanin your body produces determines the color of your skin, hair and eyes.

What are the 4 types of genetic disorders?

Four of the main types are:
  • Single-gene inheritance diseases.
  • Multifactorial genetic inheritance disorders.
  • Chromosome abnormalities.
  • Mitochondrial genetic inheritance disorders.