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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ppt2tm1Hof
targeted mutation 1, Sandra L Hoffmann
MGI:2176405
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Ppt2tm1Hof/Ppt2tm1Hof involves: 129S6/SvEvTac * C57BL/6J MGI:2176416


Genotype
MGI:2176416
hm1
Allelic
Composition
Ppt2tm1Hof/Ppt2tm1Hof
Genetic
Background
involves: 129S6/SvEvTac * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ppt2tm1Hof mutation (1 available); any Ppt2 mutation (25 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
growth/size/body
• older mice showed occasional hepatomegaly with extramedullary hematopoiesis
• in older mice, 10 - 17 months of age
• seen in mice from 7 to 17 months of age

mortality/aging
• 20% dead by 10 months of age (J:72931)
• 50% dead by 11 months of age (J:86202)
• 90% dead by 17 months of age (J:86202)

nervous system
• scattered apoptotic bodies are seen in the cerebral cortex, thalamus, and pyramidal neurons of the CA2/CA3 regions of the hippocampus in mice at 15 months of age
• at 10 months of age, moderate amounts of autofluorescent deposits found in cells throughout brain, especially in deeper nuclei of cerebral cortex, hippocampus, and pons (J:72931)
• autofluorescent bodies typical of neuronal ceroid lipofuscinosis are seen throughout the brain in mice at 15 months of age (J:86202)
• autofluorescence appears as punctate yellow-green droplets with higher concentrations in the CA2/CA3 region of the hippocampus, the pons, and the lateral dorsal nucleus of the thalamus (J:86202)
• decreased by 10% at 15 months of age
• atrophy of the white tracts in the core of the cerebellar folia
• cerebral cortex atrophy at 15 months of age
• compact with a moderate decrease in the dendritic arborization

pigmentation
• cells show bright autofluorescence
• in the brain, pancreas, bone marrow, liver macrophages, testis, fundic and pyloric gastric glands, and retinal pigment epithelium
• at 15 months of age, the ultrastructure of the storage material in the brain appears as multilamellar membranous whorls, which in most cases appear within membranous vacuolar structures
• at 15 months of age, the ultrastructure of the storage material in the pancreas appears as large, irregular blocks, somewhat more dense than in the brain, with a multilamellar pattern surrounding occasional lipid-like droplets

behavior/neurological
• in 50% of mice at 9 months of age and nearly 100% of mice at 13 months of age
• side-to-side ataxic gait develops after appearance of limb grasping phenotype
• at 10 months of age, apparent in 50% of mice and not as severe as Ppt1tm1Hof mice (J:72931)
• by 15 months of age, manifest in all mice (J:86202)

endocrine/exocrine glands
• fundic glands of the stomach contain abundant autofluorescent storage material
• cells contain abundant autofluorescent storage material
• enlarged, gelatinous and deeply pigmented, appearing orange to brown
• increase in the number of interstitial macrophages in the pancreas
• massive autofluorescence is seen in the exocrine cells of the pancreas but autofluorescence is absent from the islet cells
• however, no signs of exocrine pancreatic dysfunction are detected
• older mice (10 - 17 months) had zymogen granules replaced with large autofluorescent pigment granules
• no evidence of exocrine pancreas dysfunction, however
• interstitial cells of the Leydig in the testes are distended and inclusions in the cytoplasm are visible as brown pigment that is brightly autofluorescent

hematopoietic system
N
• despite disruption of normal compartments for hematopoiesis, normal peripheral blood counts
• in older animals, evident in all spleens and some livers, with abundant neutrophilic and erythrocytic precursors and megakaryocytes
• older mice had diffuse infiltration of macrophages, and large numbers of multinucleated giant cells
• large numbers of multinucleated giant cells that contain brightly autofluorescent material are seen in the marrow
• increase in the number of interstitial macrophages in the pancreas
• evident in older mice, loss of normal splenic architecture
• in older mice, 10 - 17 months of age
• seen in mice from 7 to 17 months of age
• evident in older mice, loss of follicles containing B cells

liver/biliary system
• moderate autofluorescence is detected in the interstitial macrophages but not in the parenchymal cells
• older mice showed occasional hepatomegaly with extramedullary hematopoiesis

muscle
• frequent myoclonic jerks without spontaneous seizures, beginning at 13 months of age

digestive/alimentary system
• massive autofluorescence is seen in the exocrine cells of the pancreas but autofluorescence is absent from the islet cells
• however, no signs of exocrine pancreatic dysfunction are detected
• older mice (10 - 17 months) had zymogen granules replaced with large autofluorescent pigment granules
• no evidence of exocrine pancreas dysfunction, however
• fundic glands of the stomach contain abundant autofluorescent storage material
• cells contain abundant autofluorescent storage material

immune system
• increase in the number of interstitial macrophages in the pancreas
• evident in older mice, loss of normal splenic architecture
• in older mice, 10 - 17 months of age
• seen in mice from 7 to 17 months of age
• evident in older mice, loss of follicles containing B cells

cellular
• scattered apoptotic bodies are seen in the cerebral cortex, thalamus, and pyramidal neurons of the CA2/CA3 regions of the hippocampus in mice at 15 months of age

reproductive system
• interstitial cells of the Leydig in the testes are distended and inclusions in the cytoplasm are visible as brown pigment that is brightly autofluorescent

vision/eye
• cells show bright autofluorescence

renal/urinary system
• a fine dust-like autofluorescence is seen in transitional cells

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
neuronal ceroid lipofuscinosis DOID:14503 OMIM:PS256730
J:72931





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last database update
11/12/2024
MGI 6.24
The Jackson Laboratory