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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Drd2tm1Low
targeted mutation 1, Malcolm J Low
MGI:1857875
Summary 12 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Drd2tm1Low/Drd2tm1Low 129S/Sv-Drd2tm1Low MGI:4429669
hm2
Drd2tm1Low/Drd2tm1Low B6.129S2-Drd2tm1Low MGI:4429667
hm3
Drd2tm1Low/Drd2tm1Low B6.129S2-Drd2tm1Low/J MGI:4429863
hm4
Drd2tm1Low/Drd2tm1Low either: B6.129S2-Drd2tm1Low or (involves: 129S2/SvPas * C57BL/6) MGI:4429660
hm5
Drd2tm1Low/Drd2tm1Low involves: 129 * C57BL/6 MGI:3625473
hm6
Drd2tm1Low/Drd2tm1Low involves: 129S2/SvPas * C57BL/6J MGI:4429665
ht7
Drd2tm1Low/Drd2+ 129S/Sv-Drd2tm1Low MGI:4429670
ht8
Drd2tm1Low/Drd2+ B6.129S2-Drd2tm1Low MGI:4429668
ht9
Drd2tm1Low/Drd2+ involves: 129S2/SvPas * C57BL/6J MGI:4429666
cn10
Drd2tm1Low/Drd2tm1Low
Tg(GFAP-CRYAB)141.6Mes/0
involves: 129S2/SvPas * C57BL/6 * FVB/N MGI:5499901
cx11
Cm/+
Drd2tm1Low/Drd2tm1Low
involves: 101/H * 129S2/SvPas * C3H/HeH * C3H/HeSn * C57BL/6J MGI:4429964
cx12
Adora2atm1Jfc/Adora2atm1Jfc
Drd2tm1Low/Drd2tm1Low
involves: 129 * C57BL/6 MGI:3625472


Genotype
MGI:4429669
hm1
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
129S/Sv-Drd2tm1Low
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mice exhibit decreased horizontal distance and initiation of movement compared with 129S/SvEv mice
• mice exhibit reduced initiation of movement compared with 129S/SvEv mice




Genotype
MGI:4429667
hm2
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
B6.129S2-Drd2tm1Low
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
N
• mice exhibit a normal saccharin and quinine preference and locomotor depressant response to SCH-23390 treatment (J:50787)
• mice exhibit normal basic motor skills without tremor, ataxia, or abnormal stance or posture (J:103181)
• mice exhibit normal novel odor habituation and odor sensitivity (J:110704)
• mice exhibit normal tactile responsivity, trigeminal nerve response, or aversive taste reactivity (J:110704)
• preference ratio is less than 0.4
• mice consume less 6% and 10% ethanol solution compared with wild-type mice
• amphetamine-treated mice fail to exhibit a reduction in prepulse inhibition unlike similarly treated wild-type mice
• however, amphetamine-treated mice exhibit normal reduction in startle reactivity
• ethanol-treated mice fail to exhibit a locomotor depressant responses unlike similarly treated wild-type mice
• ethanol-treated mice exhibit reduced ataxic response compared with similarly treated wild-type mice
• during reversal learning trials, mice preserve unreinforced behavior and commit more reversal errors across reversal sessions compared with wild-type mice
• mice exhibit reduced performance in an odor-driven stimulus-discrimination, operant task compared with wild-type mice
• mice fail to exhibit an increase in investigation of a novel odor unlike wild-type mice
• mice exhibit an impairment in olfactory discrimination compared with wild-type mice
• mice fail to exhibit increased investigation of an object with a novel scent versus one with s familiar scent unlike wild-type mice
• however, mice exhibit normal exploration behavior
• mice exhibit reduced acoustic startle response amplitude compared with wild-type mice
• on days 2 and 3, but not 4, of a rotarod test
• mice exhibit decreased horizontal distance, initiation of movement, rearing, and duration of horizontal movement compared with C57BL/6 mice (J:47001)
• mice exhibit reduced mean distance, number of movements, and time in motion compared with wild-type mice (J:50787)
• however, the movement speed and movement length are normal (J:50787)
• ethanol-treated mice exhibit reduced ataxic response compared with similarly treated wild-type mice
• mice exhibit reduced initiation of movement compared with C57BL/6 mice (J:47001)
• mice exhibit decreased initiation of movement compared with wild-type mice (J:103181)

nervous system
• mice fail to exhibit an increase in paired pulse ratio during development unlike wild-type mice
• mice fail to exhibit an increase in paired pulse ratio during development unlike wild-type mice
• mice subjected to high-frequency stimulation fail to exhibit a change in paired pulse ratio unlike similarly treated wild-type mice
• mice fail to exhibit a decrease in the frequency of spontaneous excitatory postsynaptic currents (sEPSCs) during development unlike wild-type mice
• at P21 to 27, mice exhibit increased spontaneous postsynaptic current compared with wild-type mice
• amphetamine-treated mice fail to exhibit a reduction in prepulse inhibition unlike similarly treated wild-type mice
• at P22 to 27, striatal long term depression cannot be induced by high-frequency stimulation unlike in wild-type mice

respiratory system
• under hypercapnic conditions in male, but not female, mice
• under hypoxic hypercapnic conditions in female, but not male mice
• under hypoxic hypercapnic conditions in female, but not male mice
• in male mice at day 2 and 8 of exposure to poikilocapnic hypoxia
• under hypoxic conditions in female, but not male mice
• under hypercapnic conditions in male, but not female, mice
• under hypoxic hypercapnic conditions in female, but not male mice
• at low levels of hypoxia in male mice

cardiovascular system
• mice exhibit increased blood pressure compared with wild-type mice
• during the first 5 minutes after AT1 antagonist treatment, mice exhibit a greater decrease in blood pressure than similarly treated wild-type mice
• phentolamine-treated mice exhibit a greater decrease in blood pressure than similarly treated wild-type mice
• BQ-788-treated mice exhibit a decrease in blood pressure unlike in similarly treated wild-type mice
• RES-701-1-treated mice exhibit a greater increase in blood pressure than similarly treated wild-type mice
• sarafotoxin S6c-treated mice exhibit a greater increase in blood pressure than similarly treated wild-type mice
• however, acute adrenalectomy results in normal blood pressure compared with similarly treated wild-type mice

homeostasis/metabolism
• before and after saline loading
• during the first 5 minutes after AT1 antagonist treatment, mice exhibit a greater decrease in blood pressure than similarly treated wild-type mice
• phentolamine-treated mice exhibit a greater decrease in blood pressure than similarly treated wild-type mice
• BQ-788-treated mice exhibit a decrease in blood pressure unlike in similarly treated wild-type mice
• RES-701-1-treated mice exhibit a greater increase in blood pressure than similarly treated wild-type mice
• sarafotoxin S6c-treated mice exhibit a greater increase in blood pressure than similarly treated wild-type mice
• however, mice respond normally to treatment with an ET(A) or V1 vasopressin receptor antagonist

renal/urinary system
• before and after saline loading
• before and after saline loading

growth/size/body
• in male, but not female, mice

taste/olfaction
N
• mice exhibit normal novel odor habituation and odor sensitivity

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
NOT Parkinson's disease DOID:14330 OMIM:PS168600
J:47001




Genotype
MGI:4429863
hm3
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
B6.129S2-Drd2tm1Low/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• 4% of methamphetamine-treated mice die compared with 27% of similarly treated wild-type mice

homeostasis/metabolism
• methamphetamine-treated mice fail to exhibit an increase in body temperature unlike similarly treated wild-type mice
• after 3 months in female mice and after 2 months in male mice
• cultured pituitary cells from 4 month old male and female mice release less growth hormone than similarly treated wild-type cells
• growth hormone releasing hormone (GHRH)-treated pituitary cells from 8 month old mice release less growth hormone than similarly treated wild-type cells
• however, circulating levels of growth hormone are normal
• 4% of methamphetamine-treated mice die compared with 27% of similarly treated wild-type mice
• methamphetamine-treated mice fail to exhibit an increase in body temperature unlike similarly treated wild-type mice

growth/size/body
• in male, but not female, mice
• maximal growth retardation occurs during the first half of the second month of life

nervous system
N
• microglia exhibit normal response to LPS
• at E15, more neurons enter the cerebral wall compared to in wild-type mice
• at 2 months in the substantia nigra
• more severe at 16 months in the substantia nigra and striatum
• not suppressed by quinpirole in MPTP-treated mice
• at E15, the number of GABA+ cells is increased 44% in the presumptive medial prefrontal cortex compared to in wild-type mice
• at E15, GABA+ cell density is increased in the intermediate zone 96% compared to in wild-type mice
• at E15, GABA+ cell density in the ventral zone/subventricular zone is increased 143% compared to in wild-type mice
• however, the numbers of GABA+ cells in the marginal zone and subplate/cortical plate are normal
• hyper-responsive to LPS treatment with increased production of pro-inflammatory mediators (as measured by RNA levels)
• in cultures of astrocytes and mesencephalic dopaminergic neurons, neurons exhibit reduced survival compared to in cultures with wild-type astrocytes

behavior/neurological
• relative to body weight, male mice consume more food than wild-type mice
• however, overall consumption of food is normal
• methamphetamine-treated mice fail to exhibit an increase in body temperature unlike similarly treated wild-type mice
• mice exhibit a longer duration of ultrasonic vocalization compared with wild-type mice
• however, mice exhibit normal numbers, duration, and bandwidths of ultrasonic vocalizations

adipose tissue

skeleton
• at 15 weeks in male, but not female, mice

immune system
• in male and female mice
• from cultured astrocytes stimulated with conditioned medium of microglia treated with LPS

limbs/digits/tail
• at 15 weeks in male, but not female, mice

liver/biliary system
• in male, but not female, mice

hematopoietic system
• in male and female mice

cellular
• at E15, more neurons enter the cerebral wall compared to in wild-type mice




Genotype
MGI:4429660
hm4
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
either: B6.129S2-Drd2tm1Low or (involves: 129S2/SvPas * C57BL/6)
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• in aged female mice
• shorter and thicker than in wild-type mice
• in aged female mice
• in 9 of 16 aged female mice

nervous system
• pituitary glands exhibit enlarged glandular acini unlike in wild-type mice
• however, pituitary intermediate lobe size is normal
• older female mice exhibit diffusely enlarged, hyperemic anterior pituitary lobes without focal nodules
• mice exhibit peliosis unlike wild-type mice
• fewer gonadotrophs stain positive for beta-follicle stimulating hormone and beta-luteinizing hormone compared to in wild-type mice
• in the anterior lobe due to hyperplasia and hypertrophy with prominent vascular spaces

homeostasis/metabolism
• mice exhibit a 3-fold increase in circulating prolactin levels compared with wild-type mice that is insensitive to treatment with the dopamine receptor 2 antagonist haloperidol
• ages female mice exhibit an age-dependent increase in circulating prolactin levels unlike male mice
• mice exhibit a 3-fold increase in circulating prolactin levels compared with wild-type mice that is insensitive to treatment with the dopamine receptor 2 antagonist haloperidol

endocrine/exocrine glands
• pituitary glands exhibit enlarged glandular acini unlike in wild-type mice
• however, pituitary intermediate lobe size is normal
• older female mice exhibit diffusely enlarged, hyperemic anterior pituitary lobes without focal nodules
• mice exhibit peliosis unlike wild-type mice
• fewer gonadotrophs stain positive for beta-follicle stimulating hormone and beta-luteinizing hormone compared to in wild-type mice
• in the anterior lobe due to hyperplasia and hypertrophy with prominent vascular spaces

cardiovascular system
• mice exhibit peliosis unlike wild-type mice

growth/size/body
• in aged female mice




Genotype
MGI:3625473
hm5
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
involves: 129 * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mutants do not show lower levels of locomotor stimulation in response to a Grm5 antagonist, MPEP, whereas compared to wild-type controls




Genotype
MGI:4429665
hm6
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Genetic
Background
involves: 129S2/SvPas * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mice exhibit abnormal motor function with reduced horizontal distance, initiation of movement, time in motion, and number of rearing events compared with C57BL/6 mice
• unlike in wild-type mice, locomotor parameters are unaffected by treatment with haloperidol
• reserpine and AMPT-treated mice are slightly more active than C57BL/6 mice
• locomotor parameters are unaffected by treatment with SKF38393 and quinpirole unlike in wild-type mice
• mice exhibit reduced initiation of movement compared with 129S/SvEv or C57BL/6 mice
• compared with C57BL/6 mice but not 129S/SvEv mice

homeostasis/metabolism
• unlike in wild-type mice, locomotor parameters are unaffected by treatment with haloperidol
• reserpine and AMPT-treated mice are slightly more active than similarly treated C57BL/6 mice
• locomotor parameters are unaffected by treatment with SKF38393 and quinpirole unlike similarly treated wild-type mice




Genotype
MGI:4429670
ht7
Allelic
Composition
Drd2tm1Low/Drd2+
Genetic
Background
129S/Sv-Drd2tm1Low
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mice exhibit decreased horizontal distance compared with 129S/SvEv mice




Genotype
MGI:4429668
ht8
Allelic
Composition
Drd2tm1Low/Drd2+
Genetic
Background
B6.129S2-Drd2tm1Low
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
N
• mice exhibit a normal saccharin and quinine preference and locomotor depressant response to SCH-23390 treatment
• ethanol-treated mice exhibit reduced ataxic response compared with similarly treated wild-type mice
• mice exhibit decreased horizontal distance and rearing compared with C57BL/6 mice
• ethanol-treated mice exhibit reduced ataxic response compared with similarly treated wild-type mice

cardiovascular system
• mice exhibit increased blood pressure compared with wild-type mice
• however, acute adrenalectomy results in normal blood pressure compared with similarly treated wild-type mice

growth/size/body
• compared with wild-type mice or homozygotes




Genotype
MGI:4429666
ht9
Allelic
Composition
Drd2tm1Low/Drd2+
Genetic
Background
involves: 129S2/SvPas * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mice exhibit abnormal motor function with reduced horizontal distance, initiation of movement, time in motion, and number of rearing events compared with C57BL/6 mice
• mice treated with SKF38393 and quinpirole exhibit increased horizontal distance compared with similarly treated wild-type mice

homeostasis/metabolism
• mice treated with SKF38393 and quinpirole exhibit increased horizontal distance compared with similarly treated wild-type mice




Genotype
MGI:5499901
cn10
Allelic
Composition
Drd2tm1Low/Drd2tm1Low
Tg(GFAP-CRYAB)141.6Mes/0
Genetic
Background
involves: 129S2/SvPas * C57BL/6 * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
Tg(GFAP-CRYAB)141.6Mes mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
N
• astrocytes exhibit normalized RNA expression of pro-inflammatory mediators compared to in Drd2tm1Low homozygotes




Genotype
MGI:4429964
cx11
Allelic
Composition
Cm/+
Drd2tm1Low/Drd2tm1Low
Genetic
Background
involves: 101/H * 129S2/SvPas * C3H/HeH * C3H/HeSn * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cm mutation (1 available); any Cm mutation (1 available)
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
N
• amphetamine-treated mice exhibit a normal increase in locomotor activity
• locomotor activity is normal compared with wild-type mice
• mice exhibit reduced activity compared with Cm heterozygotes
• however, locomotor activity is normal compared with wild-type mice

nervous system
N
• extracellular dopamine levels are normal compared with wild-type mice

homeostasis/metabolism
• extracellular dopamine levels are reduced compared to in Cm heterozygotes
• however, extracellular dopamine levels are normal compared with wild-type mice




Genotype
MGI:3625472
cx12
Allelic
Composition
Adora2atm1Jfc/Adora2atm1Jfc
Drd2tm1Low/Drd2tm1Low
Genetic
Background
involves: 129 * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Adora2atm1Jfc mutation (2 available); any Adora2a mutation (40 available)
Drd2tm1Low mutation (1 available); any Drd2 mutation (70 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
• mutants do not show lower levels of locomotor stimulation in response to a Grm5 antagonist, MPEP, whereas compared to wild-type controls





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