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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Lztfl1tm1e(KOMP)Wtsi
targeted mutation 1e, Wellcome Trust Sanger Institute
MGI:4363232
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Lztfl1tm1e(KOMP)Wtsi/Lztfl1tm1e(KOMP)Wtsi involves: 129S/SvEv * C57BL/6N MGI:5811522
hm2
Lztfl1tm1e(KOMP)Wtsi/Lztfl1tm1e(KOMP)Wtsi involves: C57BL/6N MGI:6827350


Genotype
MGI:5811522
hm1
Allelic
Composition
Lztfl1tm1e(KOMP)Wtsi/Lztfl1tm1e(KOMP)Wtsi
Genetic
Background
involves: 129S/SvEv * C57BL/6N
Cell Lines EPD0264_2_B11
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lztfl1tm1e(KOMP)Wtsi mutation (0 available); any Lztfl1 mutation (19 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Obesity, ventriculomegaly, and retinal degneration in Lztfl1tm1e(KOMP)Wtsi/Lztfl1tm1e(KOMP)Wtsi mice

growth/size/body
• by 16-18 weeks of age, mice weigh significantly more than wild-type controls
• mice become obese as they age

adipose tissue
• at 6 months of age, subcutaneous fat is clearly increased in both males and females, as shown by MRI analysis
• at 6 months of age, both subcutaneous and visceral fats are clearly increased in both males and females, as shown by MRI analysis

vision/eye
• isolated outer segments (OSs) from P20-P21 retinas show abnormal accumulation of non-OS proteins in the OS
• a subset of inner segment (IS) proteins ectopically accumulate in the OS, whereas most OS proteins show no or only marginal reductions
• at P21, retinas show loss of polarized Prom1 localization; although Prom1 is still found within the OS, it is no longer limited to the base but found dispersed throughout the OS, unlike in wild-type retinas
• at P21, Stx3 and Stxbp1, which are normally mostly found in the IS and the synaptic terminal, are highly enriched in the OS, whereas their pool in the rest of the photoreceptor is severely reduced
• at P45, the lamellar structure of the OS is severely disrupted; large vesicular structures are seen in the OS in a subset of photoreceptors, often close to the proximal end of the OS, while longitudinally formed discs are found in another subset of photoreceptors
• at P21, the OS is moderately shorter (60-75% of wild-type length)
• however, outer nuclear layer thickness is relatively normal until P21
• at P45, the OS structure is disorganized
• retinal photoreceptor degeneration is first evident at 2 months of age, with only minimal degeneration detected at P21
• vast majority of photoreceptors are lost by 6 months of age
• photoreceptor degeneration is likely due to accumulation of non-OS proteins in the OS
• retinas show progressive photoreceptor degeneration
• at 7-10 weeks of age, average amplitude of ERG a-wave in dark-adapted standard combined response is significantly decreased relative to that in wild-type controls
• at 7-10 weeks of age, average amplitude of ERG b-wave in dark-adapted standard combined response and 5-Hz response is significantly decreased relative to that in wild-type controls

nervous system
• at 6 months of age, mice exhibit mild ventriculomegaly
• isolated outer segments (OSs) from P20-P21 retinas show abnormal accumulation of non-OS proteins in the OS
• a subset of inner segment (IS) proteins ectopically accumulate in the OS, whereas most OS proteins show no or only marginal reductions
• at P21, retinas show loss of polarized Prom1 localization; although Prom1 is still found within the OS, it is no longer limited to the base but found dispersed throughout the OS, unlike in wild-type retinas
• at P21, Stx3 and Stxbp1, which are normally mostly found in the IS and the synaptic terminal, are highly enriched in the OS, whereas their pool in the rest of the photoreceptor is severely reduced
• at P45, the lamellar structure of the OS is severely disrupted; large vesicular structures are seen in the OS in a subset of photoreceptors, often close to the proximal end of the OS, while longitudinally formed discs are found in another subset of photoreceptors
• at P21, the OS is moderately shorter (60-75% of wild-type length)
• however, outer nuclear layer thickness is relatively normal until P21
• at P45, the OS structure is disorganized
• retinal photoreceptor degeneration is first evident at 2 months of age, with only minimal degeneration detected at P21
• vast majority of photoreceptors are lost by 6 months of age
• photoreceptor degeneration is likely due to accumulation of non-OS proteins in the OS

integument
• at 6 months of age, subcutaneous fat is clearly increased in both males and females, as shown by MRI analysis

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Bardet-Biedl syndrome 17 DOID:0110139 OMIM:615994
J:226512




Genotype
MGI:6827350
hm2
Allelic
Composition
Lztfl1tm1e(KOMP)Wtsi/Lztfl1tm1e(KOMP)Wtsi
Genetic
Background
involves: C57BL/6N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lztfl1tm1e(KOMP)Wtsi mutation (0 available); any Lztfl1 mutation (19 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• light microscopy revealed that epididymal sperm density is lower than that in heterozygous (control) males
• ~35% of total epididymal sperm exhibit different types of abnormal sperm morphology
• 30-35% of epididymal sperm exhibit abnormal sperm flagellum morphology, including uneven tail thickness, short tails and swollen tail tips
• large vacuoles are observed in the sperm flagella
• however, sperm mitochondrial sheath and core axoneme morphology is normal
• swollen tail tips are observed in some sperm
• uneven tail thickness and swollen tail tips are observed in some sperm
• disruption of the fibrous sheath is observed in some sperm
• short tails are observed in some sperm
• ~25% of epididymal sperm exhibit misshaped heads
• however, acrosome morphology is normal
• abnormal sperm nuclear shapes and abnormally developed chromatin are observed in some sperm
• however, chromatin condensation appears normal
• numerous abnormal elongating spermatids are observed at stages I-IV
• only abnormal elongating spermatid head shapes are detected at stages XIV-I
• percentage of motile sperm and sperm motility are decreased
• at stages I-IV, the seminiferous epithelium contains numerous abnormal elongating spermatids
• however, round spermatids and pachytene spermatocytes appear normal
• fewer spermatids reach mature development and elongating spermatids with excess cytoplasm (possibly attached residual bodies) are shed to the lumen
• fewer sperm are present in the cauda epididymal lumen and residual bodies appear to be attached to numerous abnormal sperm
• when bred with wild-type fertile females, adult or 8-wk-old males yield a significantly lower litter size than control males (3.13 +/- 2.81 versus 6.80 +/- 2.52)
• 6 of 10 males exhibit reduced fertility
• however, mating behavior is normal and vaginal plus are observed in females
• in vitro, sperm collected from the cauda epididymis of adult males show a reduction in the rate of IVF relative to sperm from control mice
• however, the live birth rate is not significantly changed

cellular
• light microscopy revealed that epididymal sperm density is lower than that in heterozygous (control) males
• ~35% of total epididymal sperm exhibit different types of abnormal sperm morphology
• 30-35% of epididymal sperm exhibit abnormal sperm flagellum morphology, including uneven tail thickness, short tails and swollen tail tips
• large vacuoles are observed in the sperm flagella
• however, sperm mitochondrial sheath and core axoneme morphology is normal
• swollen tail tips are observed in some sperm
• uneven tail thickness and swollen tail tips are observed in some sperm
• disruption of the fibrous sheath is observed in some sperm
• short tails are observed in some sperm
• ~25% of epididymal sperm exhibit misshaped heads
• however, acrosome morphology is normal
• however, chromatin condensation appears normal
• abnormal sperm nuclear shapes and abnormally developed chromatin are observed in some sperm
• numerous abnormal elongating spermatids are observed at stages I-IV
• only abnormal elongating spermatid head shapes are detected at stages XIV-I
• percentage of motile sperm and sperm motility are decreased

endocrine/exocrine glands
• at stages I-IV, the seminiferous epithelium contains numerous abnormal elongating spermatids
• however, round spermatids and pachytene spermatocytes appear normal





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last database update
04/23/2024
MGI 6.23
The Jackson Laboratory