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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Lhbtm1Kmr
targeted mutation 1, T Rajendra Kumar
MGI:3522112
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Lhbtm1Kmr/Lhbtm1Kmr involves: 129S7/SvEvBrd * C57BL/6J MGI:3524907


Genotype
MGI:3524907
hm1
Allelic
Composition
Lhbtm1Kmr/Lhbtm1Kmr
Genetic
Background
involves: 129S7/SvEvBrd * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lhbtm1Kmr mutation (0 available); any Lhb mutation (5 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
endocrine/exocrine glands
• the bulbourethral gland is smaller than normal
• the seminal vesicles are smaller than normal
• preovulatory follicles and healthy antral are absent
• primary and secondary follicles appear normal, whereas many antral follicles are abnormal and contain degenerating oocytes
• however, ovarian histology reveals a normal thecal layer, although expression of various thecal cell markers is significantly reduced
• the ovaries are smaller than normal
• occasional non-hemorrhagic cysts are found
• no mature Leydig cells are found in the interstitium of mutant testes
• instead, three distinct types of Leydig cells are observed, classified as fetal-like, spindle shaped progenitors and small round immature Leydig cells
• very few small-size Leydig cells are present and those seen are mostly fetal Leydig cells (J:94719)
• presence of fetal Leydig cells is confirmed by increased serum levels of the androgen precursor, androstenedione (J:122322)
• the testes are smaller than normal

growth/size/body
• occasional non-hemorrhagic cysts are found

homeostasis/metabolism
• serum and testicular testosterone levels are decreased in males and androstenedione, a testosterone precursor, levels are increased
• serum estradiol levels are decreased in females
• however, serum FSH levels remain unaffected
• serum progesterone levels are decreased in females

reproductive system
• preovulatory follicles and healthy antral are absent
• primary and secondary follicles appear normal, whereas many antral follicles are abnormal and contain degenerating oocytes
• however, ovarian histology reveals a normal thecal layer, although expression of various thecal cell markers is significantly reduced
• occasional non-hemorrhagic cysts are found
• the external female genitalia are smaller than normal
(J:94719)
• mutant uteri are hypoplastic with a thin endometrial layer (J:122322)
• only degenerating oocytes are found; however, when superovulated mutant females release comparable numbers of ova to untreated wild-type mice
(J:94719)
• no sperm are present in mutant testes (J:122322)
• no late stage or elongated spermatids are observed, consistent with an absence of histone H1-like linker protein (a late stage spermatid marker suppressed in mutant testes)
• spermatogenesis arrests at the round spermatid stage (J:94719)
• only type B spermatogonia, pachytene spermatocytes and round spermatids are identified in mutant testes, whereas late stage spermatids and sperm are clearly absent (J:122322)
• the bulbourethral gland is smaller than normal
• the seminal vesicles are smaller than normal
• no mature Leydig cells are found in the interstitium of mutant testes
• instead, three distinct types of Leydig cells are observed, classified as fetal-like, spindle shaped progenitors and small round immature Leydig cells
• very few small-size Leydig cells are present and those seen are mostly fetal Leydig cells (J:94719)
• presence of fetal Leydig cells is confirmed by increased serum levels of the androgen precursor, androstenedione (J:122322)
• the external male genitalia are smaller than normal
• mutants display postnatal defects in gonad growth and differentiation (J:122322)
• the ovaries are smaller than normal
• the testes are smaller than normal
• both males and females are sterile

cellular
• only degenerating oocytes are found; however, when superovulated mutant females release comparable numbers of ova to untreated wild-type mice
(J:94719)
• no sperm are present in mutant testes (J:122322)
• no late stage or elongated spermatids are observed, consistent with an absence of histone H1-like linker protein (a late stage spermatid marker suppressed in mutant testes)





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last database update
04/30/2024
MGI 6.23
The Jackson Laboratory