Phenotypes Associated with This Genotype

Genotype
MGI:8243413

• Allelic Composition: Adamtsl2^tm2Mtek/Adamtsl2^tm2Mtek
• Genetic Background: Not Specified

• ♀: phenotype observed in females
• ♂: phenotype observed in males
• N: normal phenotype

mortality/aging

neonatal lethality, incomplete penetrance ( J:345629 )

• mice show compromised survival with only about 60% of mice surviving after birth

cardiovascular system

abnormal myocardium layer morphology ( J:345629 )

• mice show elevated proteoglycan staining in the myocardium and chondroid metaplasia, along with patchy mild interstitial fibrosis within the myocardiaum

abnormal atrium myocardium morphology ( J:345629 )

• some mice with cardiac fibrosis have histologic evidence of small areas with chondroid metaplasia localized mainly in the atrium and the aortic valve

cardiac hypertrophy ( J:345629 )

• hearts show hypertrophic cardiomyopathy along with myocyte hypertrophy of varying severity

abnormal aortic valve morphology ( J:345629 )

• some mice with cardiac fibrosis have histologic evidence of small areas with obvious chondroid metaplasia localized mainly in the aortic valve and the atrium

cardiac interstitial fibrosis ( J:345629 )

• patchy mild interstitial cardiac fibrosis is seen in the most severely affected mice

abnormal heart echocardiography feature ( J:345629 )

• echocardiograms show reduced ejection fraction, stroke volume, cardiac output, and fractional shortening, increased left ventricular end-systolic internal diameter (LVID) and increased end-systolic volume (ESV) indicating systolic dysfunction indicative of inadequate ejection of blood from the heart chambers following each systolic contraction

• systolic dysfunction is progressive as LVID and ESV are increased at 20 weeks compared to12 weeks

• the ratio of peak mitral inflow velocity during early diastole and mitral annular velocity is altered, indicating increased ventricular filling pressure

• increase in the left-ventricular end-systolic anterior wall thickness at 12 weeks of age

• mice show a large variability of aortic valve peak pressure and aortic ejection time

• however, parameters of diastolic dysfunction, such as isovolumic relaxation time and mitral ratio of the early to late ventricular filling velocities, are not altered

cardiomyopathy ( J:345629 )

• hearts show hypertrophic cardiomyopathy along with myocyte hypertrophy of varying severity

• MRI shows that hearts are unable to pump all the blood and end-systolic images show that end-systolic ventricles are still full of blood

cellular

cardiac interstitial fibrosis ( J:345629 )

• patchy mild interstitial cardiac fibrosis is seen in the most severely affected mice

craniofacial

abnormal cranium morphology ( J:345629 )

• cranium is more rounded

short nasal bone ( J:345629 )

short snout ( J:345629 )

growth/size/body

cardiac hypertrophy ( J:345629 )

• hearts show hypertrophic cardiomyopathy along with myocyte hypertrophy of varying severity

short nasal bone ( J:345629 )

short snout ( J:345629 )

slow postnatal weight gain ( J:345629 )

• mice show reduced weight gain starting from 3-4 weeks of age

immune system

lung inflammation ( J:345629 )

• evidence of microscopic post-obstructive pneumonia is seen, characterized by accumulation of foamy macrophages within alveolar airspaces, in the most affected mice

limbs/digits/tail

brachyphalangia ( J:345629 )

• proximal phalanges of second, third, and fourth digits from front paws are shorter

short femur ( J:345629 )

• femur length is shortened, but no difference is seen in width or cortical thickness

muscle

abnormal myocardium layer morphology ( J:345629 )

• mice show elevated proteoglycan staining in the myocardium and chondroid metaplasia, along with patchy mild interstitial fibrosis within the myocardiaum

abnormal atrium myocardium morphology ( J:345629 )

• some mice with cardiac fibrosis have histologic evidence of small areas with chondroid metaplasia localized mainly in the atrium and the aortic valve

cardiomyopathy ( J:345629 )

• hearts show hypertrophic cardiomyopathy along with myocyte hypertrophy of varying severity

• MRI shows that hearts are unable to pump all the blood and end-systolic images show that end-systolic ventricles are still full of blood

respiratory system

short nasal bone ( J:345629 )

lung inflammation ( J:345629 )

• evidence of microscopic post-obstructive pneumonia is seen, characterized by accumulation of foamy macrophages within alveolar airspaces, in the most affected mice

abnormal lung morphology ( J:345629 )

• MRI shows bilateral ground glass opacification with multifocal areas of poorly defined consolidation in the lungs of the most severe cases

• however, no significant pulmonary fibrosis is seen

abnormal respiratory function ( J:345629 )

• whole-body plethysmography at 12 weeks and 20 weeks of age indicates respiratory dysfunction in the expiration phase in some mice

• severity of respiratory insufficiency varies

• males exhibit a more severe respiratory dysfunction than females

• no significant progression of respiratory dysfunction is seen between 12 and 20 weeks

• mice show a less severe respiratory dysfunction than homozygous Adamts12^tm2Mtek mice

abnormal forced expiratory flow rates ( J:345629 )

• indicators of the expiration phase, including pause (Penh), pause index, and the peak expiratory flow/peak inspiratory flow ratio, are affected

• however, the inspiration phase and other parameters of respiration, including respiratory rate and tidal volume, are not altered

skeleton

abnormal cranium morphology ( J:345629 )

• cranium is more rounded

short nasal bone ( J:345629 )

brachyphalangia ( J:345629 )

• proximal phalanges of second, third, and fourth digits from front paws are shorter

short femur ( J:345629 )

• femur length is shortened, but no difference is seen in width or cortical thickness

Mouse Models of Human Disease		DO ID	OMIM ID(s)	Ref(s)
geleophysic dysplasia 1		DOID:0111725	OMIM:231050	J:345629