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DORSAL CELL FATE SPECIFIED BY CHICK LMX1 DURING VERTEBRATE LIMB DEVELOPMENT

机译:小鸡肢体发育过程中小鸡LMX1指定的背细胞命运

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THE positional cues that govern the fate of cells along the dorsoventral axis of the developing vertebrate limb are established in the mesoderm before outgrowth of limb buds. In Drosophila, a LIM/homeodomain gene, apterous, expressed in the dorsal compartment of the wing disc, specifies dorsal cell fate(1,2). Here we report the isolation of a vertebrate LIM-homeodomain containing gene, Chick Lmx1 (C-Lmx1). Transcripts for C-Lmx1 are detected in the presumptive dorsal limb mesoderm and are restricted thereafter to the dorsal mesoderm of the developing chick bud. C-Lmx1 expression is regulated by the overlying ectoderm where Wnt7a messenger RNA is localized(3). Wnt7a, required for normal development of the dorsoventral axis in mouse limbs(4), can induce ectopic expression of C-Lmx1 in ventral mesoderm, Misexpression of C-Lmx1 during limb outgrowth causes ventral to dorsal transformations of limb mesoderm, We propose that C-Lmx1 specifies dorsal cell fate during chick limb development.
机译:沿发育中的脊椎动物肢体的背腹轴控制细胞命运的位置提示是在肢体芽长出之前在中胚层中建立的。在果蝇中,在翼片背侧隔室中表达的LIM /同源域基因是特有的,它指定了背侧细胞的命运(1,2)。在这里,我们报告了包含脊椎动物LIM-同源域的基因小鸡Lmx1(C-Lmx1)的分离。 C-Lmx1的转录本在推测的背肢中胚层中检测到,此后仅限于发育中的鸡芽的背中胚层。 C-Lmx1的表达受Wnt7a信使RNA所在的外胚层调控(3)。 Wnt7a是小鼠肢体背腹轴正常发育所必需的(4),可诱导C-Lmx1在腹膜中胚层中的异位表达,在肢体长出过程中C-Lmx1的错误表达导致肢体中胚层的腹侧向背侧转化,我们建议C -Lmx1指定鸡肢发育期间的背细胞命运。

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