1. Removal from one place to another; metathesis. 2. The condition of being in the wrong place or on the wrong side of the body, as in t. of the viscera, in which the viscera are located opposite their normal position; e.g., the liver on the left, the apex of the heart on the right. 3. Positioning of teeth out of their normal sequence in an arch.
- t. of arterial stems SYN: t. of the great vessels.
- corrected t. of the great vessels anatomically or physiologically corrected malposition of the great arteries. In anatomically corrected t., they arise from the correct ventricles but have an abnormal relation to each other (actually a malposition rather than a t..) In physiologically or functionally corrected t., the aorta arises from a systemic ventricle that has the morphologic characteristics of a right ventricle, and the pulmonary artery arises from a “venous” ventricle that has the morphologic characteristics of a left ventricle.
- t. of the great vessels congenital malformation in which the aorta arises from the morphologic right ventricle and the pulmonary artery from the morphologic left ventricle resulting in two separate and parallel circulations. The condition is lethal unless some communication exists between the systemic and pulmonic circulation after birth; otherwise, unoxygenated venous blood inappropriately enters the systemic circulation, and oxygenated pulmonary venous blood is inappropriately directed to the pulmonary circulation. The life-sustaining communication may be an intraatrial passage or a patent ductus arteriosus. SYN: t. of arterial stems.
- penoscrotal t. a developmental error, seen with hypospadias, whereby hemiscrotal units are separated and lie lateral to the penile shaft or even cranial to it.

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trans·po·si·tion .tran(t)s-pə-'zish-ən n an act, process, or instance of transposing or being transposed: as
a) the displacement of a viscus to a side opposite from that which it normally occupies <\transposition of the heart>
b) the transfer of a segment of DNA from one site to another in the genome either between chromosomal sites or between an extrachromosomal site (as on a plasmid) and a chromosome
trans·po·si·tion·al -'zish-nəl adj

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the abnormal positioning of a part of the body such that it is on the opposite side to its normal site in the body. For example, it may involve the heart (see dextrocardia).

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trans·po·si·tion (trans″po-zĭґshən) [trans- + position] 1. any of various congenital anomalies in which organs are displaced to the opposite side from normal. 2. the operation of carrying a tissue flap from one situation to another without severing its connection entirely until it is united at its new location. 3. the exchange of position of two atoms within a molecule. 4. movement of genetic information from one locus to another, such as via a transposable element.

Medical dictionary. 2011.

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Look at other dictionaries:

  • transposition — Transposition …   Thresor de la langue françoyse

  • transposition — [ trɑ̃spozisjɔ̃ ] n. f. • v. 1370; de transposer 1 ♦ Changement de place, et spécialt(XVIe) Interversion. « Par une transposition de sens, M. de Cambremer vous regardait avec son nez » (Proust). Pathol. Transposition vasculaire : anomalie… …   Encyclopédie Universelle

  • Transposition — may mean: * Transposition (cardiac), a congenital heart defect with malformation of any of the major vessels. * Transposition (chess), different moves or a different move order leading to the same position, especially during the openings. *… …   Wikipedia

  • transposition — Transposition. s. f. v. Renversement de l ordre naturel dans lequel les mots doivent estre rangez. Transposition vicieuse. transposition élegante. la Poësie souffre plus les transpositions que la Prose. il y a des transpositions qui ont bonne… …   Dictionnaire de l'Académie française

  • Transposition — Trans po*si tion, n. [F. transposition, from L. transponere, transpositum, to set over, remove, transfer; trans across, over + ponere to place. See {Position}.] The act of transposing, or the state of being transposed. Specifically: [1913… …   The Collaborative International Dictionary of English

  • transposition — 1530s, from Fr. transposition or directly from M.L. transpositionem, noun of action from transponere (see TRANSPOSE (Cf. transpose)) …   Etymology dictionary

  • transposition — transposition. См. транспозиция. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Transposition — (v. lat.), 1) das Versetzen eines Gliedes einer Gleichung auf die entgegengesetzte Seite unter Veränderung des Vorzeichens. Ist z.B. gegeben 5a + 3b = c, so wird c transponirt, wenn man schreibt: 5a + 3b – c = o; diese T. ist richtig nach dem… …   Pierer's Universal-Lexikon

  • transposition — index delivery, exchange, replacement Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • Transposition — Transposition, Umlagerung von DNA Elementen an andere Stellen im Genom von Prokaryoten oder Eukaryoten. Die Empfänger DNA wird anders als beim reziproken crossing over um die umgelagerte Sequenz verlängert. Insertionselemente (IS) heißen diese… …   Deutsch wörterbuch der biologie

  • transposition — фр. [транспозисьо/н], нем. [транспозицио/н], англ. [транспэзи/шн] trasposizione ит. [траспозицио/нэ] транспозиция, транспонировка (перелож. произведения в др. тональность) …   Словарь иностранных музыкальных терминов

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