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A novel enhancer of Shh in tooth development

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Adasooriya Dinuka, °æ¹ÎÀç, ±èÁø¼±, Á¶¼º¿ø,
¼Ò¼Ó »ó¼¼Á¤º¸
 ( Adasooriya Dinuka ) - Yonsei University College of Dentistry Department of Oral Biology
°æ¹ÎÀç ( Kyeong Min-Jae ) - Yonsei University College of Dentistry Department of Oral Biology
±èÁø¼± ( Kim Jin-Sun ) - Yonsei University College of Dentistry Department of Oral Biology
Á¶¼º¿ø ( Cho Sung-Won ) - Yonsei University College of Dentistry Department of Oral Biology

Abstract

Sonic Hedgehog (Shh)´Â ¹ß´Þ °úÁ¤¿¡¼­ ÆÐÅÏ Çü¼º¿¡ Áß¿äÇÑ ¿ªÇÒÀ» ÇÏ´Â À¯ÀüÀÚÀÌ´Ù. ShhÀÇ Á¶ÀýÀº ¸¶¿ì½º¿¡¼­ °ÅÀÇ 850 kb¿¡ Èð¾îÁ® ÀÖ´Â ¿©·¯ ÀÎÇÚ¼­¿¡ ÀÇÇØ Á¶ÀýµÈ´Ù. Shh·ÎºÎÅÍ ÀÎÆ®·Ð°ú 430 kb »çÀÌ¿¡¼­ ½Å°æ°è ÀÎÇÚ¼­°¡ ¹ß°ßµÇ¾ú°í, 430¿¡¼­ 850 kb ¶³¾îÁø °÷¿¡¼­´Â ±¸°­, ÀεÎ, Æó, ³»Àå ¹× ÆÈ´Ù¸®ÀÇ ÀÎÇÚ¼­°¡ º¸°íµÇ¾ú´Ù. ÀÌ ¿¬±¸¿¡¼­ ¿ì¸®´Â ¸¶¿ì½º¿¡¼­ ShhÀÇ 502 kb ¾÷½ºÆ®¸²¿¡ À§Ä¡ÇÑ »õ·Î¿î Àå°Å¸® ÀÎÇÚ¼­ MRCS2¸¦ ¹ß°ßÇÏ¿´´Ù. ¿ì¸®´Â Ä¡¹è¿¡¼­ MRCS2 ÀÎÇÚ¼­°¡ Shh ÇÁ·Î¸ðÅÍ ºÎºÐ°ú ¹°¸®ÀûÀ¸·Î »óÈ£ÀÛ¿ëÀ» ÇÑ´Ù´Â °ÍÀ» È®ÀÎÇÏ¿´´Ù. MRCS2 È°¼ºÈ­¸¦ È®ÀÎÇϱâ À§ÇÑ lacZ-reporter ¸¶¿ì½º¿¡¼­ MRCS2´Â ±¸°­ ³»¿¡¼­ È°¼ºÀ» º¸ÀÌÁö¾Ê¾Ò´Ù. ÀÌ´Â MRCS2°¡ Shh ¹ßÇö À§Ä¡¸¦ °áÁ¤ÇÏÁö ¾ÊÀ½À» ÀǹÌÇÑ´Ù. MRCS2°¡ Shh ¹ßÇöÀÇ Á¤µµ¸¦ Á¶ÀýÇÏ´ÂÁö ¿©ºÎ¸¦ È®ÀÎÇϱâ À§ÇØ Á¦ÀÛÇÑ MRCS2-°á¼Õ ¸¶¿ì½º¿¡¼­µµ Ç¥ÇöÇüÀÇ º¯È­´Â °üÂûµÇÁö ¾Ê¾Ò´Ù. ÀÌÀü °á°ú¿¡¼­µµ ´ÜÀÏ ÀÎÇÚ¼­°¡ °á¼ÕµÈ ¸¶¿ì½º¿¡¼­´Â ±¸°­±¸Á¶ÀÇ º¯È­°¡ ¾ø¾ú´Ù. ÀÌ·¯ÇÑ °á°ú·Î º¸¾Æ, MRCS2°¡ ShhÀÇ ¹ßÇö¿¡ °ü¿©Çϱä ÇÏÁö¸¸, MRCS2ÀÇ °áÇÌÀÌ ´Ù¸¥ ÀÎÇÚ¼­¿¡ ÀÇÇØ ÃæºÐÈ÷ º¸»óµÇ´Â °ÍÀ¸·Î ÆǴܵȴÙ.

Sonic hedgehog (Shh) is a highly regulated gene that plays a major role in pattern formation in the developmental process. The Regulation of Shh is dependent on a long-range regulatory mechanism consisting of multiple enhancers which are scattered over nearly 850 kb in the mouse genome. Nervous system enhancers have been uncovered between intron and 430 kb upstream of Shh. The intergenic region from 430 kb to 850 kb has been reported to be a residence for enhancers in the oral cavity, pharynx, lungs, gut, and limbs. However, the intergenic region from 430 kb to 550 kb upstream of Shh have not been studied in detail. In this study, we found a novel long-range enhancer located 502 kb upstream of Shh in mouse. The enhancer named MRCS2 showed a physical interaction with the Shh promoter in the developing tooth. The pattern of MRCS2 activation did not match the pattern of Shh expression, indicating that MRCS2 does not determine the localization of Shh expression. Phenotypic change was not observed in the MRCS2-deleted mice, indicating that deletion of MRCS2 alone could not cause morphological changes in teeth. These results suggest that although MRCS2 regulates the expression level of Shh, the deficiency of MRCS2 is sufficiently compensated by other enhancers.

Å°¿öµå

Ä¡¹è; ¹ß»ý; ÀÎÇÚ¼­; Shh
Tooth Germ; Development; Enhancer; Shh

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