variant (var´e-ant)

1. That which, or one who, is variable. 2. Having the tendency to alter or change, exhibit variety or diversity, not conform, or differ from the type.
inherited albumin v.'s [MIM*103600] types of human serum albumin, distinguished by characteristic mobility patterns on electrophoresis; each type is due to a mutation of a gene controlling albumin synthesis; the mutant genes are codominant with the normal gene for albumin A, and the group forms a system of genetic polymorphism; types include: albumin b (slow), found occasionally in persons of European ancestry; albumin Ghent (fast), found first at Ghent, Belgium; albumin Mexico (slow), found in Indians of Mexico and the southwestern United States; albumin Naskapi (fast), found in the Naskapi and other Indians of northern North America; and albumin Reading (fast), found first at Reading, England.
L-phase v.'s bacterial v.'s which do not have rigid cell walls but which may contain varying amounts of cell wall material; they are spherical to coccobacillary in shape and vary in size from small bodies that pass through filters which retain bacteria to bodies that are larger than the bacterial form; they are Gram-negative and resistant to penicillin; some revert to the bacterial phase upon removal of the inducing substance, whereas others do not; the v.'s differ greatly from the parent bacterial cells in mode of reproduction, physiology, growth requirements, and individual and colonial morphology; they are generally considered to be nonpathogenic, even if derived from a pathogenic bacterium. [L. fr. Lister Institute]


Browse Medical References:

[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M]
[N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]