Mouse Genome Informatics
hm1
    Add1tm1Llp/Add1tm1Llp
involves: 129P2/OlaHsd * 129S1/SvImJ * C57BL/6J
Key:
phenotype observed in females WTSI Wellcome Trust Sanger Institute
phenotype observed in males EuPh Europhenome
N normal phenotype
mortality/aging
• intercrosses of heterozygotes yields only 16% homozygotes, less than mendelian prediction, indicating in utero loss

hematopoietic system
N
• the white blood cell count is normal (J:138919)
• spleens are normal in weight and iron content (J:138919)
• red blood cells are osmotically fragile, shperocytic, hypochromic, microcytic, and have a lower maximum deformability index with ektacytometry showing a loss of membrane surface area
• more pronounced in males than females
• in both males and females
• red blood cells have diminished membrane surface area relative to that in wildtype controls
• indicative of a compensatory increase in the rate of erythropoiesis
• found in both males and females
• platelet counts are elevated significantly in males and to a lesser extent in females
• mean platelet volume is significantly lower in females and lower in males to a level that did not reach statistical significance

homeostasis/metabolism
N
• platelet shape and bleed time are normal (J:138919)
• plasma BUN and electrolyte concentrations are normal (J:138919)

nervous system
• approximately half of homozygotes develop hydrocephaly, and on average this phenotype is overtly visible by 8 weeks of age
• progressive dilation of the lateral and third ventricles with the cerebral aqueduct open resulting in accumulation of fluid within the fourth ventricle

growth/size/body
• homozygotes are smaller than normal at birth and throughout life
• average weight of only approximately 10g at 5 weeks of age is much less than littermate controls