Point mutation

Colon cancer is cancer of the large intestine (colon), the lower part of your digestive system. Most colon cancer cases begin as small, noncancerous or benign clusters of cells called adenomatous polyps. Over long periods time some of these polyps can potentially become colon cancers. Polyps may be small and can cause few, if any at all, symptoms. Because of this reason, doctors tend to recommend having regular screening tests to help prevent colon cancer by recognising and removing polyps…

Fibrosis? Cystic Fibrosis is a genetic disease that is one of the most common and lethal. The disease is usually noticeable in the victim by the age of 3 and impairs their ability to breathe and digest normally. This genetic disease is caused by a mutation of the CFTR gene (cystic fibrosis transmembrane conductance regulator). Everyone does have this gene, but only when it is mutated can it cause Cystic Fibrosis. Normally, the CFTR gene produces a protein whose job is to regulate salt and fluids…

large decrease in the size of an original population can eliminate a large amount of genes. 23. How does mutation increase genetic variation in a way that crossing over and independent assortment do not? This because during mutation selection removes deleterious alleles however, dangerous recessive alleles are preserved in heterozygotes and are reintroduced by mutations 24. How does mutation alter allele frequencies? are a continual source of genetic variation in…

syndromes. Lynch syndrome is due to germline mutations in the MMR system, including MLH1, MSH2, MSH6 and PMS2 genes, and in EPCAM gene, that cause high microsatellite instability and increase the risk of endometrioid, clear cell and undifferentiated carcinoma. Lynch syndrome is responsible of 5% of endometrial cancers and 1% of ovarian cancer cases, but high microsatellite instability is found in 30-40% of endometrial carcinomas, due to somatic mutations and MSH1 promoter methylation. The…

Description of Unknown Mutant Allele Phenotype Subtle differences were observed after comparing all body parts of mutant and a wild type D. Melanogaster. It was discovered that normal venation pattern was disrupted in mutant D. Melanogaster. The phenotype mutation (vein pattern) of D. Melanogaster was identified with a different degree of expressivity in mutant D. Melanogaster; this was achieved by differentiating the single line (longitudinal vein 5) on a wild-type wing which was disrupted.…

In the article "Schizophrenia begins in the womb, study suggests" by Honor Whiteman on the Medical News Today discusses the research devoted to Schizophrenia. The article talks about the abnormal gene labeled FGFR1 that can impair brain development early on. The scientists believe that this research could then find treatments and maybe prevent schizophrenia in the utero. Treatments such as giving pregnant women a drug that could prevent the process developing in the fetus. They discuss that…

Klippel-Feil Syndrome: An Overview According to the National Organization for Rare Disorders (2016), Klippel-Feil syndrome (KFS) is a rare disorder of the skeletal system characterized by cervical spine fusion of two or more vertebrae. The disorder was first documented in 1912 by two doctors Maurice Klippel and Andre Feil (NORD, 2016). Individuals with KFS often exhibit the hallmark features such as a short neck, low hairline, and limited neck mobility. Additional associated malformations may…

The concept of genetically engineering humans was once confined to the franchises of fiction – stories of half-humans and shapeshifters, transgenesis and cyborging, genetic superpowers and mutations. The list goes on, but one crucial thing has changed – now these once impossible ideas have seemingly become attainable. Ever since female scientists in the United States and Sweden discovered CRISPR-Cas9, the scientific community has been debating over how to use this new power in their hands.…

leucine to proline at amino acid position 1544(Ashcroft, 2005). This mutation simply reduce the activation of the channel by stimulatory nucleotide MgADP, as the NBDs sensitivity to this nucleotide is greatly/entirely lost. The failure of the channel activation means the open state of the channel pore is greatly reduced/blocked. This occurs as the inhibitory nucleotide (ATP) would have higher affinity for the channel than the activating nucleotide (MgADP). Closure of the K+ channel leads to…

Mutations in genes can have complicated relationships and interactions that affect the phenotype of an organism. Possible genetic variations include nonsynonymous mutations, deletion of coding sequences, translocations, transposable element insertions, alterations within introns and disruption of regulatory elements, as examples. These alterations can cause a range of phenotypic effects from no effect to cell death for essential genes. Disruptions that result in an essential phenotype are…