Inbred Strains of Mice: MA
MAInbr (J): 132. Albino. Genet.
c.Origin: Marsh's strain 3. Started from a pair of mice from the Lathrop-Loeb colony (1903-1915). 32 generations of cousin mating by Marsh, to W.S.Murray who started b x s (
Murray 1963).
CharacteristicsPrimary lung tumours 37% in males, 42% in females. Lymphatic leukaemia 1% in males and breeding females, zero in virgin females. Mammary tumours zero (
Hoag, 1963). Low gross tumour incidence (22/22) (
Storer, 1966). Polydipsia-polyuria (
Bernstein, 1966), which may be associated with cysts pressing on posterior lobe of pituitary (
Russell and Meier, 1966). Life-span intermediate in both sexes (7/22 = 459 days in males, 12/22 = 585 days in females) (
Storer, 1966).
High metabolic rate (3/18) (Storer, 1967). High plasma cholinesterase activity in females (4/22) but low in males (18/22) (Angel et al., 1967., 1967). Low liver arylsulphatase activity (11/12) (Daniel, 1976). Only strain out of 29 tested that carries the mannosephosphate isomerase Mpi 1a allele (Nichols et al., 1973., 1973).
Small spinal cord (23/25) (Roderick et al., 1973., 1973). Large kidney/body weight ratio (4/21) (Schlager, 1968). Large hippocampus (2/9) (Wimer et al., 1969., 1969). Fusion between left part of median lobe and left lateral lobe of liver is common (Bunker, 1959).
Resistant to X-irradiation (2/27 in J substrain, 7/27 in My substrain) (Roderick, 1963). Resistant to pulmonary hyaline-membrane formation (1/10) and long survival in 90% oxygen (3/10) (Lieberman and Kellog, 1967).
Highly susceptible to the mammary tumour virus, which is not normally carried by the strain (Murray and Little, 1967).
Angel C. R., Mahin D. T., Farris R. D., and Woodward K. T. (1967) Heritability of plasma cholinesterase activity in inbred mouse strains. Science 156, 529-530.Bunker L. E. (1959) Hepatic fusion, a new gene in linkage group I of the mouse. J. Hered. 50, 40-44.
Daniel W. L. (1976) Genetics of murine liver and kidney arylsulfatase B. Genetics 82, 477-491.
Hoag W. G. (1963) Spontaneous cancer in mice. Ann. NY Acad. Sci. 108, 805-831.
Murray W. S. (1963) MA/My strain of the Marsh albino mouse. J. Natl. Cancer Inst. 30, 605-610.
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