Arabidopsis thaliana MERISTEM LAYER 1 (ATML1), an HD-ZIP class IV homeobox gene, is one of the key regulators promoting epidermal cell differentiation in Arabidopsis thaliana. We recently showed that ATML1 was able to confer an ectopic shoot epidermis cell fate to non-epidermal tissues of seedlings, suggesting that ATML1 is a master regulator of epidermal cell fate. To further assess the roles ...

We have often observed small dense bodies in the cytoplasm of cells of the stratum granulosum during a study of the fine structure of normal and experimentally altered mouse ear epidermis. Odland (10) noted their presence in human epidermis, showed that they have an internal structure, and speculated that they may be degenerating mitochondria. Other authors seem to have overlooked them in their...

BACKGROUNDS Basal cell carcinoma affects areas of the body that have been exposed to the sun, and this disorder has different clinical and histopathologic presentations. Some of these forms have a higher potential of local aggressiveness, while others have a lower potential. Langerhans cells actively participate in the skin immune system. OBJECTIVES To quantitatively evaluate the number of La...

The mammalian epidermis is maintained by proliferation and differentiation of epidermal progenitor cells in a stereotyped developmental program. Here we report that tissue-specific deletion of the UV-damaged DNA-binding protein 1 (DDB1) in mouse epidermis led to dramatic accumulation of c-Jun and p21Cip1, arrest of cell cycle at G(2)/M, selective apoptosis of proliferating cells, and as a resul...

Basal cell carcinoma (BCC) is a malignant tumor of epithelial cells that is composed of cells similar to those in the basal area of the epidermis and its appendages. Ninety- five percent of individuals with BCC are between 40 and 79 years old. It rarely occurs in younger individuals. Herein, a 20- year- old woman with type III skin, who had a BCC on her chin is presented. Since the clinic...

Cell fate determination and differentiation are central processes in the development of multicellular organisms, and the Arabidopsis (Arabidopsis thaliana) root epidermis provides a model system to study the molecular basis of these processes. A lateral inhibition mechanism mediated by an R3 single-repeat MYB protein, CAPRICE (CPC), has been proposed to explain the specification of the two type...

The onion (Allium cepa L.) is widely planted worldwide as a valuable vegetable crop. The scales of an onion bulb are a modified type of leaf. The one-layer-cell epidermis of onion scales is commonly used as a model experimental material in botany and molecular biology. The lower epidermis (LE) and upper epidermis (UE) of onion scales display obvious differences in microscopic structure, cell di...

The petal epidermis acts not only as a barrier to the outside world but also as a point of interaction between the flower and potential pollinators. The presence of conical petal epidermal cells has previously been shown to influence the attractiveness of the flower to pollinating insects. Using Antirrhinum isogenic lines differing only in the presence of a single epidermal structure, conical c...

Our study aims at explaining why the 3D higher-order chromatin structure developmentally controlled keratinocyte-specific loci of sub-population epidermal basal layer cells is organized in fundamentally different way. We performed analysis widefield and SIM super-resolution images mouse cryosections with FISH immunofluorescence. One still not fully understood aspects differentiation importance ...

Plant organ shape and size are established during growth by a predictable, controlled sequence of cell proliferation, differentiation, and elongation. To understand the regulation and coordination of these processes, we studied the temporal behavior of epidermal and cortex cells in Arabidopsis pedicels and used computational modeling to analyze cell behavior in tissues. Pedicels offer multiple ...