Survival of Hoxa13 homozygous mutants reveals a novel role in digit patterning and appendicular skeletal development.

Survival of Hoxa13 homozygous mutants reveals a novel role in digit patterning and appendicular skeletal development.
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DOI:
10.1002/dvdy.22183
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发表时间:
2010-02
影响因子:
2.5
通讯作者:
Stadler, H. Scott
Stadler, H. Scott
中科院分区:
生物学3区
文献类型:
--
作者:
Perez, Wilma D.;Weller, Crystal R.;Shou, Siming;Stadler, H. Scott

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HOXA13功能的丧失严重破坏了胚胎肢体的发育。然而,由于缺乏HOXA13的胚胎在妊娠中期死亡,突变肢体中存在的缺陷可能是胚胎健康恶化的次要后果。在我们对突变Hoxa13GFP等位基因的分析中,我们发现了一组存活的纯合突变体,它们表现出严重的肢体缺陷,包括:指骨缺失,腕骨/跗骨融合,掌骨/跖骨长度明显缩短。在受影响的腕/跗骨区域的软骨原基因表征显示Gdf5表达显著降低,而Bmp2表达显著升高。对gdf5mrna定位的分析还显示,在腕/跗骨角原中弥漫表达,这表明HOXA13在描绘单个腕/跗骨元素所需的细胞组织中发挥作用。总之,这些结果确定Gdf5是HOXA13靶基因的潜在靶基因,并确认HOXA13在阑尾骨骼发育过程中的特定作用。
The loss of HOXA13 function severely disrupts embryonic limb development. However, because embryos lacking HOXA13 die by mid-gestation, the defects present in the mutant limb could arise as a secondary consequence of failing embryonic health. In our analysis of the mutant Hoxa13GFP allele, we identified a surviving cohort of homozygous mutants exhibiting severe limb defects including: missing phalanx elements, fusions of the carpal/tarsal elements, and significant reductions in metacarpal/metatarsal length. Characterization of prochondrogenic genes in the affected carpal/tarsal regions revealed significant reduction in Gdf5 expression, whereas Bmp2 expression was significantly elevated. Analysis of Gdf5 mRNA localization also revealed diffuse expression in the carpal/tarsal anlagen, suggesting a role for HOXA13 in the organization of the cells necessary to delineate individual carpal/tarsal elements. Together these results identify Gdf5 as a potential target gene of HOXA13 target gene and confirm a specific role for HOXA13 during appendicular skeletal development.
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