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Phenotypes Associated with This Genotype
Genotype
MGI:2658769
Allelic
Composition
Br/Br+
Genetic
Background
involves: 101/H * C3H/HeH
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Br mutation (1 available); any Br mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mutants die at early maturity

craniofacial
• all craniofacial variables are significantly smaller in mutant mice compared with normal mice
• data reveals sagittal growth deficiency in the anterior cranial base
• the top but not the back of the cranium is rounded compared with normal mice
• due to malocclusion; if left untrimmed, incisors continue to grow and eventually curve inward, piercing the oral tissues and preventing ingestion
• incisors do not wear down during mastication, presumably due to incisal malocclusion
• this condition is chronic and teeth must be cut on a regular basis to allow mice to eat
• this condition allows accurate identification of adult mutant mice
• condyles and necks of mutant mice are typically smaller and thinner compared with normal mice
• processes of mutant mice are smaller and shorter while projecting superiorly rather than posterosuperiorly as in control mice
• newborns display some midfacial shortening (J:47869)
• all facial bones are shortened (J:15489)
• newborns display evidence of median cleft lip (J:47869)
• deeper than usual midline cleft of the upper lip (J:13450)
• noticeable at birth

growth/size/body
• due to malocclusion; if left untrimmed, incisors continue to grow and eventually curve inward, piercing the oral tissues and preventing ingestion
• incisors do not wear down during mastication, presumably due to incisal malocclusion
• this condition is chronic and teeth must be cut on a regular basis to allow mice to eat
• this condition allows accurate identification of adult mutant mice
• condyles and necks of mutant mice are typically smaller and thinner compared with normal mice
• processes of mutant mice are smaller and shorter while projecting superiorly rather than posterosuperiorly as in control mice
• newborns display some midfacial shortening (J:47869)
• all facial bones are shortened (J:15489)
• newborns display evidence of median cleft lip (J:47869)
• deeper than usual midline cleft of the upper lip (J:13450)
• noticeable at birth
• kidneys of newborns have a rough and irregular surface indicative of multifocal cyst formation in underlying tubules

renal/urinary system
• few glomeruli
• kidneys of newborns have a rough and irregular surface indicative of multifocal cyst formation in underlying tubules

skeleton
• all craniofacial variables are significantly smaller in mutant mice compared with normal mice
• data reveals sagittal growth deficiency in the anterior cranial base
• the top but not the back of the cranium is rounded compared with normal mice
• due to malocclusion; if left untrimmed, incisors continue to grow and eventually curve inward, piercing the oral tissues and preventing ingestion
• incisors do not wear down during mastication, presumably due to incisal malocclusion
• this condition is chronic and teeth must be cut on a regular basis to allow mice to eat
• this condition allows accurate identification of adult mutant mice
• condyles and necks of mutant mice are typically smaller and thinner compared with normal mice
• processes of mutant mice are smaller and shorter while projecting superiorly rather than posterosuperiorly as in control mice

digestive/alimentary system


Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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last database update
01/28/2026
MGI 6.24
The Jackson Laboratory