Combining droplet and full-length sequencing technologies for a complete picture
			21¼¼±â ÃÊ, Â÷¼¼´ë ¿°±â¼¿  ºÐ¼®¹ýÀÎ NGS (Next-Generation Sequencing) ±â¼úÀÌ ÃâÇöÇϸé¼, À¯ÀüÀÚ ¿¬±¸¿¡ Á¢±ÙÇÏ´Â ¹æ½Ä¿¡ Å« º¯È°¡ ÀÖ¾ú´Ù. ´ë·®ÀÇ ¼¼Æ÷À»  µ¿½Ã¿¡ ºÐ¼®Çϸé Èñ±ÍÇÑ »ý¹°ÇÐÀû Çö»óÀ» È®ÀÎÇÏ±â ¾î·Æ´Ù´Â °ÍÀÌ ¸í¹éÇÏ°Ô ¹àÇôÁö¸é¼, ¿¬±¸ÀÚµéÀº single cell sequencingÀ» ÀÌ¿ëÇØ °¢°¢ÀÇ ¼¼Æ÷ ¿ªÇÒÀ» È®ÀÎÇÒ ¼ö ÀÖ°Ô µÇ¾ú´Ù. 
			Droplet¿¡ ±â¹ÝÇÑ single  cell sequencingÀº ¸¹Àº ¼öÀÇ ¼¼Æ÷¸¦ Çѹø¿¡ ºÐ¼®ÇÒ ¼ö ÀÖÁö¸¸, ¼¼Æ÷¸¦ ¿ÏÀüÈ÷  ÀÌÇØÇϱ⿡´Â ºÒÃæºÐÇÏ´Ù´Â °ÍÀ» È®ÀÎÇÏ¿´´Ù.
			ÃÖ±Ù, California Institute of  Technology¿Í Allen Institute of Brain ScienceÀÇ ¿¬±¸¿¡¼ 
SMART-Seq¢çÀ»  ÀÌ¿ëÇÑ ÀüÀå ºÐ¼®°ú droplet ±â¹ÝÇÑ ¹æ¹ý, ±×¸®°í ÇüÅ  ºÐ¼®À» ÅëÇØ »óÈ£ º¸¿ÏÀûÀ¸·Î single cellÀ» ÀÌÇØÇÒ ¼ö ÀÖÀ½À» È®ÀÎÇÏ¿´´Ù (Booeshaghi 
et al. 2020).
			
Teaming up
			¿¬±¸ÀÚµéÀº BRAIN Initiative Cell Census NetworkÀÇ mouse primary motor cortex (MOp) ºÐ¼® °á°ú¸¦ ÀÌ¿ëÇÏ¿´À¸¸ç, ÇØ´ç °á°ú´Â 
SMART-Seq¢ç·Î ºÐ¼®ÇÑ 6,160 ¼¼Æ÷¿Í  10x Genomics Chromium (10xv3)·Î ºÐ¼®ÇÑ 90,031  ¼¼Æ÷·ÎºÎÅÍ µµÃâµÇ¾ú´Ù (±×¸² 1, Panel A). µÎ  ±â¼úÀ» ÀÌ¿ëÇÑ °æ¿ì ¸ðµÎ¿¡¼ ´Ù¾çÇÑ ¼¼Æ÷ À¯ÇüÀ» ½Äº°ÇÒ ¼ö ÀÖ¾ú´Ù. 10xv3¸¦ ÀÌ¿ëÇßÀ» ¶§¿¡´Â ºÐ¼®  °¡´ÉÇÑ ¼¼Æ÷ÀÇ ¼ö°¡ ´õ ¸¹±â¿¡ Èñ±ÍÇÑ ¼¼Æ÷ À¯ÇüÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú´ø ¹Ý¸é, 
SMART-SeqÀ»  ÀÌ¿ëÇßÀ» ¶§¿¡´Â ´õ ³ôÀº °¨µµ·Î ÀüÀå Àü»çü¸¦ ºÐ¼®ÇÒ ¼ö Àֱ⿡ isoformÀÇ Á¤·®»Ó ¾Æ´Ï¶ó, ¼¼Æ÷¸¦ ¼¼ºÐÈÇÏ¿© ºÐ·ùÇÒ ¼ö ÀÖ¾ú´Ù.
			ÀÌÈÄ, ¿¬±¸ÀÚµéÀº Glutamatergic,  GABAergic neuronÀÇ isoformÀ» 
SMART-Seq¢ç  v4¸¦ ÀÌ¿ëÇØ ºÐ¼®ÇÏ¿´°í, µÎ Á¾ÀÇ ¼¼Æ÷¿¡¼ ¾ÈÁ¤ÀûÀ¸·Î ¹ßÇöµÇ´Â 260°³ÀÇ À¯ÀüÀÚ¿Í 312°³ÀÇ isoform  marker¸¦ È®ÀÎÇÏ¿´´Ù. ±× Áß 
H3f3b´Â ÇϳªÀÇ isoform¿¡¼´Â  glutamatergic neurons¿¡¼ ³ôÀº ¹ßÇöÀ» º¸¿´°í, ,  GABAergic neuronÀº 
H3f3b-204 isoformÀÇ ³·Àº ¹ßÇöÀ» º¸¿´´Ù (±×¸² 1, Panel B). ÇØ´ç ³í¹®ÀÇ ÀúÀÚ´Â ¡°À¯ÀüÀÚ ¼öÁØÀÇ ºÐ¼®À¸·Î´Â  isoform º¯È¿¡ ´ëÇØ ¾Ë ¼ö ¾ø´Ù.¡±°í ÁöÀûÇß´Ù. 
SMART-seq¢çÀ»  ÀÌ¿ëÇÑ isoform Á¤·®, cell subclass, cluster  assignmentsÀº 10xv3ÀÇ °á°ú¿Í ºñ±³ÇÏ¿© °ËÁõµÇ¾úÀ¸¸ç, ÀÌ µ¥ÀÌÅ͸¦ Á¾ÇÕÇϸé isoform atlasÀ» Æ÷ÇÔÇÏ´Â MOpÀ¸·Î Ȱ¿ëµÉ ¼ö ÀÖ´Ù (±×¸²  2).
			
 ±×¸² 1. À¯ÀüÀÚ  ƯÀ̼º ºÐ¼®¿¡¼´Â È®ÀεÇÁö ¾Ê´Â isoform ƯÀ̼º 
			(Panel A)
			±×¸² 1. À¯ÀüÀÚ  ƯÀ̼º ºÐ¼®¿¡¼´Â È®ÀεÇÁö ¾Ê´Â isoform ƯÀ̼º 
			(Panel A) Overview of data  analyzed.
			
(Panel C) The 
H3f3b gene  abundance distribution across cells (left) and 
H3f3b-204 isoform  distribution across cells (right). Image and caption adapted from Figure 1  of 
Booeshaghi et al.  2020 (some panels not shown) and used under a 
Creative Commons Attribution  4.0 International License.
			
 ±×¸² 2. Isoform  atlas
			±×¸² 2. Isoform  atlas
			A sample from an isoform atlas displaying isoform markers differential  with respect to subclasses. Each row corresponds to one subclass, and each  column corresponds to one isoform. SMART-Seq isoform abundance estimates are in  TPM units, and each column is scaled so that the maximum TPM is four times the  mean of the isoform specific for that row's cluster. Image and caption adapted  from Figure 2 of 
Booeshaghi et al.  2020 (subset of figure not shown) and used under a 
Creative Commons Attribution  4.0 International License.
			Isoform ¹ßÇöÀ» º¸´Ù ½ÉÃþÀûÀ¸·Î ÀÌÇØÇϱâ À§ÇØ, spatial MERFISH ºÐ¼® °á°ú¸¦ ÀÌ¿ëÇÏ¿© SMART-Seq  isoform Á¤·® °ªÀ» º¸Á¤ÇϰíÀÚ Çß´Ù. ÇØ´ç ³í¹®ÀÇ ÀúÀÚ´Â MERFISH ºÐ¼®À» ÅëÇØ, 
Pvalb À¯ÀüÀÚ°¡ motor cortexÀÇ Àü Á¶Á÷¿¡¼ ¹ßÇöµÇ°í ÀÖÀ½À» È®ÀÎÇÏ¿´À¸³ª, 
SMART-seq¢çÀ»  ÅëÇØ È®ÀÎµÈ µÎ isoform Áß Çϳª¸¸ ¹ß°ßÇÒ ¼ö ÀÖ¾ú´Ù. À̸¦  ÅëÇØ, ¸¸¾à MERFISH¸¸À¸·Î À¯ÀüÀÚ¸¦ ºÐ¼®ÇÏ´Â °æ¿ì ¹ßÇöµÇ´Â isoformÀ» ¹ß°ßÇÏÁö ¸øÇÒ ¼ö ÀÖÀ½À» È®ÀÎÇÏ¿´´Ù.
			
 ±×¸² 3. Mop¿¡¼ÀÇ  Pvalb ¼¼Æ÷ (º°Ç¥)ÀÇ  ºÐÆ÷ È®ÀÎ
			±×¸² 3. Mop¿¡¼ÀÇ  Pvalb ¼¼Æ÷ (º°Ç¥)ÀÇ  ºÐÆ÷ È®ÀÎ 
			Image and caption adapted from Extended  Data Figure 7, Panel B of 
Booeshaghi et al.  2020 (some data not shown) and used under a 
Creative Commons Attribution 4.0 International  License.
			
A new age for scRNA-seq analysis
			¾Æ¸®½ºÅäÅÚ·¹½º´Â ¡°The whole is greater than the sum of its parts¡±¶ó°í ¸»Çß½À´Ï´Ù. ÀÌ ¿¬±¸´Â ÇϳªÀÇ ±â¼úÀ» ÀÌ¿ëÇÏ´Â °Í º¸´Ù ¼·Î ´Ù¸¥ ±â¼úÀ» Á¢¸ñÇÏ¿© ¿¬±¸¸¦ ÁøÇàÇÔÀ¸·Î½á ½ÉÃþÀûÀÎ ¿¬±¸¸¦ ÁøÇàÇÒ ¼ö ÀÖÀ½À» º¸¿©ÁÖ´Â ¿¹·Î, ÇØ´ç ³í¹®ÀÇ ÀúÀÚ´Â scRNA-seq¿¡ ´ëÇØ ¾Æ·¡¿Í °°Àº °üÁ¡À» Á¦°øÇÕ´Ï´Ù.
			
			
				The [SMART-Seq] technology should be viewed as a  complement, rather than competitor, to droplet or spatial single-cell RNA-seq.  Our analyses suggest that a workflow consisting of droplet-based single-cell  RNA-seq to identify cell types, then SMART-Seq [v4 chemistry] for isoform  analysis, and finally spatial RNA-seq with a panel based on isoform-specific  markers identified by SMART-Seq [v4 chemistry], would effectively leverage  different technologies' strengths."
			
			
			
			
			[¿ø¹®] Combining  droplet and full-length sequencing technologies for a complete picture
			[Âü°í¹®Çå] 
			- Booeshaghi, A. S. 
et  al. Isoform cell type specificity in the mouse primary motor cortex. 
bioRxiv 2020.03.05.977991  (2020).