dynein arm

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dyn·ein arm

a structure extending clockwise from one tubule of each of the nine doublet microtubules toward the adjacent doublet in the axoneme of cilia or flagella (including human sperm tails); congenital absence of dynein, reflected structurally by absence of dynein arms; can account for symptoms seen in Kartagener syndrome an immotile cilia syndrome.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
(1997) The Chlamydomonas reinhardtii ODA3 gene encodes a protein of the outer dynein arm docking complex.
(1997) Phosphoregulation of an inner dynein arm complex in Chlamydomonas reinhardtii is altered in phototactic mutant strains.
(1985) A mutant of Chlamydomonas reinhardtii that lacks the flagellar outer dynein arm but can swim.
The dynein arms are observed as projections from A-tubules of outer doublet microtubules.
(79,80) The regulation of dynein arms by CP/RS involves protein phosphorylation/ dephosphorylation.
(25) Using this method, the sliding direction of the doublet microtubules was determined; that is, the dynein arms on tubule A of a doublet microtubule push the B tubule of the adjacent doublet microtubule toward the tip of the cilium.
The sliding of doublet microtubules was influenced by various factors, including the number of dynein arms on the doublet microtubule, ATP, [Ca.sup.2+] and cAMP.
(1988) Mutations at twelve independent loci result in absence of outer dynein arms in Chylamydomonas reinhardtii.
[72] Afzelius, B.A, Eliasson, R., Johnson, O., Lindholmer, C., 1975, "Lack of dynein arms in immotile human spermatozoa," J.
One version forms the dynein arms, whose motion whips 9+2 cilia back and forth.
Transmission electron microscopy is the current gold standard to assess ultrastructural defects, shortening or absence of dynein arms is the most common finding.
Dynein arms extend from one side of a doublet in a clockwise direction, when viewed from the tip of the cilium.