Phenotypes associated with this allele
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
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mortality/aging
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• most homozygotes die within a day or two of birth, but a few survive to adulthood
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cardiovascular system
hematopoietic system
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• evident as early as E15; about half the normal number of red cells are present
• there is considerable erythrocyte destruction and a compensating release of immature blood cells into the circulation
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• spectrin does not accumulate in the reticulocyte plasma membrane
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immune system
liver/biliary system
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• developed within hours after birth
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cellular
growth/size/body
Allelic Composition |
Sptbja/Sptbja
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Genetic Background |
involves: 129/Sv * C57BL/6J * WB/Re |
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
|
|
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hematopoietic system
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• red blood cell protoporphyrin levels are about 10 times higher than in controls
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homeostasis/metabolism
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
|
|
|
mortality/aging
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• homozygotes transfused with peripheral blood cells during one of the first 3 days of life generally survive to adulthood with a mean life expectancy of 3.7 months
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• most homozygotes die within 48 hours of birth
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• nearly all untreated homozygotes die by 4 days of age, although a single transfusion of wild type peripheral blood cells at 1, 2, or 3 days of age can prolong lifespan into adulthood
(J:44313)
• fewer than 13% of homozygotes survive to weaning
(J:162532)
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cellular
muscle
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• 38% of transfusion rescued adults show sites of infarction in the myocardium in the ventricular or ventricular septal regions and 15% display large thrombi within the heart mainly in the mitral or left atrioventricular valve
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hematopoietic system
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• transfusion rescued adults have severe splenomegaly with expanded vasculature, areas of necrosis and fibrosis, and most of the splenic mass made of red pulp
(J:44313)
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• cell surface expression of phosphatidylserine is higher than in wild-type controls, with 11.6% of erythrocytes straining positive for phosphatidylserine versus 1.6% in wild-type controls
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• transfusion rescued adults have very low red blood cell count, 4,200,000/ul instead of 9,150,000/ul
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• approximately half of normal numbers
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• transfusion rescued adult homozygotes have a mean hematocrit of 21.6% compared with 45% in wild-type controls
(J:44313)
• mean hematocrit is reduced to 24.7% from 50.4% in wild-type controls
(J:162532)
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• decreased to 18.6% in transfusion resuced adults compared to 29.8% in controls
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• greatly reduced hemoglobin of 4 g/dL in transfusion rescued adults compared to 13.5 g/dL in controls
(J:44313)
• mean hemoglobin content is reduced to 4.85 g/dl from 15.64 g/dl in wild-type controls
(J:162532)
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• more than 10 times normal levels
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• the percentage of erythroid cells that are microcytes is much larger than in wild-type controls
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• approximately 90% reticulocytes
(J:44313)
• mean percent of reticulocytes is substantially increased from 3.16% in wild-type controls to 91.4%
(J:162532)
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• sodium content of erythrocytes is elevated to 49.1 mEq/l from 12.4 mEq/l in wild-type controls, and the membrane cholesterol and phospholipid content is reduced
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• average erythrocyte lifespan of 0.7 days
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• erythrocytes are too easily damaged in handling to permit clear quantification of osmotic fragility
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homeostasis/metabolism
immune system
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• transfusion rescued adults have severe splenomegaly with expanded vasculature, areas of necrosis and fibrosis, and most of the splenic mass made of red pulp
(J:44313)
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liver/biliary system
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• transfusion rescued adults have hepatomegaly with multiple sites of hematopoiesis, regions of fibrosis and necrosis, and expanded vasculature
(J:44313)
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• although not jaundiced at birth, homozygotes develop severe jaundice within hours of being born
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adipose tissue
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• transfusion rescued adults have a nearly complete lack of fat pads
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cardiovascular system
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• 38% of transfusion rescued adults show sites of infarction in the myocardium in the ventricular or ventricular septal regions and 15% display large thrombi within the heart mainly in the mitral or left atrioventricular valve
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• transfusion rescued adults have enlarged hearts with dilated chambers and expanded vasculature
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renal/urinary system
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• extraordinary amounts of iron accumulate in the adult kidney, particularly within the proximal convoluted tubules, and leads to green colored urine by 2 to 3 months of age and progresses to hydronephrosis and possible renal failure
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nervous system
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• the brains of transfusion rescued adults are smaller and vertically flatter than normal with the angle of the brain to the spinal cord decreased to approximately 120 degrees instead of the normal 135 to 140 degrees which makes the curvature of the cerebellum a sharper angle than normal
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• some transfusion rescued adults have infarctions in the cerebrum, hippocampus, and cerebellum, which are generally unilateral, and microthrombi are sometimes found close to the infarction
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reproductive system
growth/size/body
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• transfusion rescued adults have enlarged hearts with dilated chambers and expanded vasculature
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• transfusion rescued adults have hepatomegaly with multiple sites of hematopoiesis, regions of fibrosis and necrosis, and expanded vasculature
(J:44313)
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• transfusion rescued adults have severe splenomegaly with expanded vasculature, areas of necrosis and fibrosis, and most of the splenic mass made of red pulp
(J:44313)
|
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
|
|
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hematopoietic system
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• heterozygotes have a mild, well compensated anemia, with the survival time of red cells slightly reduced
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• heterozygotes have a higher concentration of protoporphyrin in red cells than wild-type mice
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homeostasis/metabolism
Allelic Composition |
Sptbja/Sptb+
|
|
Genetic Background |
involves: 129/Sv * C57BL/6J * WB/Re |
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
|
|
|
hematopoietic system
|
• red blood cells show a higher concentration of protoporphyrin than wild-type
|
homeostasis/metabolism
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sptbja mutation
(2 available);
any
Sptb mutation
(85 available)
|
|
|
hematopoietic system
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• reduced erythrocyte lifespan
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• erythrocytes from heterozygotes are more osmotically fragile
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