2017b|biblio/28747695]]).
-### The 5′ cap enhances C-tailing
-
- - [[Schmidt & Mueller, 1999|biblio/10518626]] showed that extra cytosine are
- more frequently added in presence of the 5′ cap.
+### Reverse-transcription of the 5′ cap.
-
-### The 5′ cap is reverse-transcribed
+#### Pro:
- [[Hirzmann et al., 1993|biblio/8346046]] observed the presence of an extra G
at the 5′ end of cDNA clones, and concluded that the cap can be
reverse-transcribed, with a frequency of 10 %. They also discussed if it
could be that the cap was reverse-transcribed.
+ - [[Schmidt & Mueller, 1999|biblio/10518626]] showed that extra cytosine are
+ more frequently added in presence of the 5′ cap.
+
- [[Ohtake et al, 2004|biblio/15500255]] synthethised RNAs with A-caps and
showed that they are reverse-transcribed as Ts.
- [[Zhang et al, 2017|biblio/28673998]] published a structure of an RNA-GpppG
complex that suggests that a m7GpppNm / DNA duplex could form during the
- reverse-transcription of the cap
+ reverse-transcription of the cap.
+
+#### Con:
- - Nevertheless, in [[Dallmeier and Neyts, 2013|biblio/23123427]], where
+ - [[Chenchick and coll., 1998|biblio/Chenchick_1998]] reported that non-capped
+ oligonucleotides were extended with long (1~5) cytosine tails, and that the
+ presene of a cap did not have a “significant influence”.
+
+ - In [[Dallmeier and Neyts, 2013|biblio/23123427]], where
first-strand cDNAs prepared with a phosphorylated reverse-transcription
primer were circularised, amplified and sequenced, there is not visible
evidence for G addition.
+
### Reverse-transcriptases tolerate terminal mismatches
- Reported by [[Mizuno et al., 1999|biblio/9973624]].