What is hamartin?
Hamartin is a 1,164-amino-acid/130 KDa tumor suppressor protein expressed in most human tissues (Plank et al., 1999; Johnson et al., 2001). It is hydrophilic and has transmembrane domains at amino acids 127–144 and within its coiled-coil region at residues 719–998 (Nellist et al., 1999).
Where is hamartin Localised?
cytoplasm
Hamartin is localized to the membrane/particulate (P100) fraction of cultured cells. The P100 localization is unchanged in the Eker cells. Finally, we show that at endogenous expression levels, hamartin has a punctate pattern of immunofluorescence in the cytoplasm.
What are TSC1 and TSC2?
TSC1 and TSC2 are disease genes for tuberous sclerosis complex (TSC), a neurocutaneous disorder in which hamartomas and other benign tumors form in many organs including brain, skin, and kidneys.
What is the TSC1 gene?
The TSC1 gene provides instructions for producing a protein called hamartin. Within cells, hamartin interacts with a protein called tuberin, which is produced from the TSC2 gene. These two proteins help control cell growth and division (proliferation) and cell size.
What is hamartin and tuberin?
Tumour suppressors hamartin and tuberin, encoded by tuberous sclerosis complex 1(TSC1) and TSC2 genes, respectively, are critical regulators of cell growth and proliferation. Mutations in TSC1 and TSC2 genes are the cause of an autosomal dominant disorder known as tuberous sclerosis complex (TSC).
How do you test for tuberous sclerosis?
Tests for tuberous sclerosis
- an eye examination – to check for eye tumours.
- a skin examination – to look for abnormal growths or patches of pale or thickened skin.
- an MRI scan – to detect tumours in the brain or kidneys.
- a CT scan or ultrasound scan – to detect tumours in the kidneys, heart or lungs.
How do you get tuberous sclerosis?
What causes tuberous sclerosis? Tuberous sclerosis is caused by changes (mutations) in either the TSC1 or TSC2 gene. These genes are involved in regulating cell growth, and the mutations lead to uncontrolled growth and multiple tumours throughout the body.
Is tuberous sclerosis complex autosomal dominant or recessive?
Tuberous sclerosis complex has an autosomal dominant pattern of inheritance, which means one copy of the altered gene in each cell is sufficient to increase the risk of developing tumors and other problems with development.
What is adenoma Sebaceum?
As described by Osborne,[1] the term adenoma sebaceum is a commonly used misnomer for facial angiofibromas occurring as a skin manifestation of tuberous sclerosis. These lesions appear in infancy or early childhood in a characteristic butterfly-shaped pattern[2] over both cheeks and the nose.
Where is the TSC1 gene located?
Chromosome 9
TSC1
| Gene location (Human) | ||
|---|---|---|
| Chr. | Chromosome 9 (human) | |
| Band | 9q34.13 | 132,891,348 bp |
| 132,946,874 bp |
What are the signs of tuberous sclerosis complex?
Most people with tuberous sclerosis have patches of light-colored skin, or they may develop small, harmless areas of thickened, smooth skin or reddish bumps under or around the nails. Facial growths that begin in childhood and resemble acne also are common. Seizures.
What is the difference between tuberous sclerosis and tuberous sclerosis complex?
Tuberous sclerosis, also known as tuberous sclerosis complex, is a rare genetic condition that causes mainly non-cancerous (benign) tumours to develop in different parts of the body. The tumours most often affect the brain, skin, kidneys, heart, eyes and lungs.
What is adenoma mean?
Listen to pronunciation. (A-deh-NOH-muh) A tumor that is not cancer. It starts in gland-like cells of the epithelial tissue (thin layer of tissue that covers organs, glands, and other structures within the body).