By Helen M. Kingston
This ABC is a concise, hugely illustrated creation to genetic mechanisms desirous about inherited issues. the recent variation has been widely up to date with new and revised chapters to surround speedy advances within the box. easy genetic strategies are defined in addition to the appliance of latest applied sciences in scientific perform. info on proper websites also are incorporated besides advised texts for additional examining.
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Additional info for ABC of Clinical Genetics, 3rd Edition
In X linked dominant disorders such as incontinentia pigmenti, female gene carriers have patchy skin pigmentation that follows Blaschko’s lines because of the mixture of normal and mutant cells in the skin during development. Chromosomal mosaicism is not infrequent, and arises by postzygotic errors in mitosis. Mosaicism is observed in conditions such as Turner syndrome and Down syndrome, and the phenotype is less severe than in cases with complete aneuploidy. Mosaicism has been documented for many other numerical or structural chromosomal abnormalities that would be lethal in non-mosaic form.
Unbalanced Robertsonian translocations may arise spontaneously or be inherited from a parent carrying a balanced translocation. 11 Balanced Robertsonian translocation affecting chromosomes 14 and 21 21 21 14 14 Unbalanced Robertsonian translocation affecting chromosomes 14 and 21 and resulting in Down syndrome Reciprocal translocations Reciprocal translocations involve exchange of chromosomal segments between two different chromosomes, generated by the chromosomes breaking and rejoining incorrectly.
3 Examples of diseases caused by mitochondrial DNA mutations Disorder Symptoms Common mutation Inheritance Leber hereditary optic neuropathy (LHON) Acute visual loss and possibly other neurological symptoms Point mutation at position 11778 in ND4 gene of complex 1 Maternal MERRF Myoclonic epilepsy, other neurological symptoms and ragged red fibres in skeletal muscle Point mutation in tRNA-Lys gene (position 8344) Maternal Kaerns–Sayre syndrome Progressive external ophthalmoplegia, pigmentary retinopathy, heart block, ataxia, muscle weakness, deafness Large deletion (position 8470-13447) Large tandem duplication Usually sporadic Encephalomyopathy, lactic acidosis, stroke-like episodes Point mutation in tRNA-Leu gene (position 3243) MELAS Sporadic Maternal 33 ABC of Clinical Genetics accumulation of mitochondrial mutations with time has been suggested as playing a role in ageing.
ABC of Clinical Genetics, 3rd Edition by Helen M. Kingston