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<meta name="description" content="A comparative genomic analysis of the recently sequenced human body louse unicellular endosymbiont Candidatus Riesia pediculicola with a reduced genome (582 Kb), revealed that it is the only known organism that might have lost all post-transcriptional base and ribose modifications of the tRNA body, …"><meta name="keywords" content="pmid:23308034, PMC3539174, Valérie de Crécy-Lagard, Christian Marck, Henri Grosjean, PubMed Abstract, NIH, NLM, NCBI, National Institutes of Health, National Center for Biotechnology Information, National Library of Medicine, MEDLINE"><meta name="robots" content="index,nofollow,noarchive"><meta property="og:title" content="Decoding in Candidatus Riesia pediculicola, close to a minimal tRNA modification set? - PubMed"><meta property="og:url" content="https://pubmed.ncbi.nlm.nih.gov/23308034/"><meta property="og:description" content="A comparative genomic analysis of the recently sequenced human body louse unicellular endosymbiont Candidatus Riesia pediculicola with a reduced genome (582 Kb), revealed that it is the only known organism that might have lost all post-transcriptional base and ribose modifications of the tRNA body, …"><meta property="og:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:image:secure_url" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:type" content="website"><meta property="og:site_name" content="PubMed"><meta name="twitter:domain" content="pubmed.ncbi.nlm.nih.gov"><meta name="twitter:card" content="summary_large_image"><meta name="twitter:title" content="Decoding in Candidatus Riesia pediculicola, close to a minimal tRNA modification set? - PubMed"><meta name="twitter:url" content="https://pubmed.ncbi.nlm.nih.gov/23308034/"><meta name="twitter:description" content="A comparative genomic analysis of the recently sequenced human body louse unicellular endosymbiont Candidatus Riesia pediculicola with a reduced genome (582 Kb), revealed that it is the only known organism that might have lost all post-transcriptional base and ribose modifications of the tRNA body, …"><meta name="twitter:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg">
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<div class="include-supplemental-container">
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
</div>
<div class="form-field recaptcha ">
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
</div>
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="send">
Send email
</button>
<button class="action-panel-cancel"
aria-label="Close 'Email citations' panel"
ref="linksrc=close_email_panel"
aria-controls="email-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="cancel">
Cancel
</button>
</div>
<input type="hidden" name="email-search-details" value="" />
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
</form>
</div>
</div>
<div id="collections-action-panel"
class="collections-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-collections-open-panel-enabled="false"
data-collections-open-panel-url-hash="#open-collections-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to Collections
</h3>
<form id="collections-action-panel-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-myncbi-max-collection-name-length="100"
data-add-to-collection-max-amount="1000"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
<input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2">
<div class="choice-group" role="radiogroup">
<ul class="radio-group-items">
<li>
<input type="radio"
id="collections-action-panel-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_new">
<label for="collections-action-panel-new">Create a new collection</label>
</li>
<li>
<input type="radio"
id="collections-action-panel-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_existing">
<label for="collections-action-panel-existing">Add to an existing collection</label>
</li>
</ul>
</div>
<div class="controls-wrapper">
<div class="action-panel-control-wrap new-collections-controls">
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label>
<input
type="text"
name="add-to-new-collection"
id="collections-action-panel-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="save_share"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection">
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div>
</div>
<div class="action-panel-control-wrap existing-collections-controls">
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
Choose a collection:
</label>
<select id="collections-action-panel-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="save_share"
data-ga-action="select_collection"
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
</select>
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br>
<a href="#">Please try again</a>
</div>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="add">
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="bibliography-action-panel"
class="bibliography-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-bibliography-open-panel-enabled="false"
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to My Bibliography
</h3>
<form id="bibliography-action-panel-form"
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-add-to-bibliography-max-amount="100"
data-add-to-bibliography-batch-size="10"
data-bibliography-delegates-url="/list-bibliography-delegates/"
data-add-to-bibliography-url="/add-to-bibliography/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
<input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2">
<div class="action-panel-control-wrap bibliographies-controls">
<div class="choice-group">
<ul class="bibliographies-action-add radio-group-items">
<li>
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
<label for="my-bibliography">My Bibliography</label>
</li>
</ul>
</div>
</div>
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your delegates due to an error<br>
<a href="#">Please try again</a>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore>
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to bibliography' panel"
ref="linksrc=close_bibliography_panel"
aria-controls="bibliography-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="mybib"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
data-saved-search-open-panel-enabled="false"
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your saved search
</h2>
<form id="saved-search-action-panel-form"
class="saved-search-action-panel-form action-panel-content action-form"
data-create-saved-search-url="/create-saved-search/"
data-try-search-terms-url="/try-search-term/"
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
<input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2">
<div class="action-panel-control-wrap">
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
Name of saved search:
</label>
<input maxlength="200"
type="text"
name="saved-search-name"
id="saved-search-name"
class="saved-search-name"
value=""
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
Search terms:
</label>
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
</div>
<div class="test-search-term-wrap">
<a href="#" class="try-search-term">Test search terms</a>
</div>
<div class="choice-group action-panel-extra-margin-top">
<span class="action-panel-label" id="fieldset-label">
Would you like email updates of new search results?
</span>
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
<ul class="radio-group-items">
<li>
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
</li>
<li>
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
<label for="saved-search-alert-no" class="action-panel-label">No</label>
</li>
</ul>
</fieldset>
</div>
<div class="alert-schedule-wrap">
<div class="action-panel-control-wrap">
<label class="action-panel-label">
Email:
</label>
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
</div>
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="saved-search-frequency" class="action-panel-label">
Frequency:
</label>
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
<option value="monthly">Monthly</option>
<option value="weekly">Weekly</option>
<option value="daily">Daily</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-monthly-additional">
<label for="saved-search-monthly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
<option value="Sunday">The first Sunday</option>
<option value="Monday">The first Monday</option>
<option value="Tuesday">The first Tuesday</option>
<option value="Wednesday">The first Wednesday</option>
<option value="Thursday">The first Thursday</option>
<option value="Friday">The first Friday</option>
<option value="Saturday">The first Saturday</option>
<option value="day">The first day</option>
<option value="weekday">The first weekday</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-weekly-additional">
<label for="saved-search-weekly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
<option value="Sunday">Sunday</option>
<option value="Monday">Monday</option>
<option value="Tuesday">Tuesday</option>
<option value="Wednesday">Wednesday</option>
<option value="Thursday">Thursday</option>
<option value="Friday">Friday</option>
<option value="Saturday">Saturday</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-report" class="action-panel-label">
Report format:
</label>
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
<option value="DocSum">Summary</option>
<option value="DocSumText">Summary (text)</option>
<option value="Abstract">Abstract</option>
<option value="AbstractText">Abstract (text)</option>
<option value="MEDLINE">PubMed</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-amount" class="action-panel-label">
Send at most:
</label>
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
<option value="1">1 item</option>
<option value="5" selected>5 items</option>
<option value="10">10 items</option>
<option value="20">20 items</option>
<option value="50">50 items</option>
<option value="100">100 items</option>
<option value="200">200 items</option>
</select>
</div>
<div>
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
Send even when there aren't any new results
</label>
</div>
<div class="action-panel-control-wrap option-text-in-email-wrap">
<label for="saved-search-email-text" class="action-panel-label">
Optional text in email:
</label>
<textarea name="saved-search-email-text"
id="saved-search-email-text"
class="saved-search-email-text"></textarea>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Saving..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Save
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your saved search' panel"
ref="linksrc=close_saved_search_panel"
aria-controls="saved-search-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Create a file for external citation management software
</h2>
<form id="citation-manager-action-panel-form"
class="action-panel-content action-form"
action="/results-export-ids/"
data-by-search-action="/results-export-search-data/"
data-by-ids-action="/results-export-ids/"
method="post"
data-by-search-method="post"
data-by-ids-method="post">
<input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2">
<input name="results-format" type="hidden" value="pubmed"/>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="save">
Create file
</button>
<button class="action-panel-cancel"
aria-label="Close 'Send citations to citation manager' panel"
ref="linksrc=close_citation_manager_panel"
aria-controls="citation-manager-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your RSS Feed
</h2>
<form id="rss-action-panel-form"
class="rss-action-panel-form action-panel-content action-form"
data-create-rss-feed-url="/create-rss-feed-url/"
data-search-form-term-value="">
<input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2">
<div class="action-panel-control-wrap">
<label for="rss-name" class="action-panel-label required-field-asterisk">
Name of RSS Feed:
</label>
<input maxlength="200"
placeholder="Name"
type="text"
name="rss-name"
id="rss-name"
class="rss-name"
value=''
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="rss-limit-wrap">
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="rss-limit" class="action-panel-label">
Number of items displayed:
</label>
<select id="rss-limit" class="no-border-panel-selector rss-limit">
<option value="5">5</option>
<option value="10">10</option>
<option value="15" selected="selected">15</option>
<option value="20">20</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Creating..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Create RSS
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your RSS' panel"
ref="linksrc=close_rss_panel"
aria-controls="rss-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
<div class="action-panel-control-wrap rss-link-copy-wrap">
<label for="rss-link" class="usa-sr-only">RSS Link</label>
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
<button
type="button"
disabled
class="rss-link-copy-button disabled"
data-ga-category="save_share"
data-ga-action="rss"
data-ga-label="copy">
Copy
</button>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="article-page" id="article-page" data-article-pmid="23308034">
<aside class="page-sidebar">
<div class="inner-wrap">
<div class="full-text-links">
<div class="full-view">
<h3 class="title">
Full text links
</h3>
<div class="full-text-links-list">
<a class="link-item
pmc
dialog-focus"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/23308034/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=23308034&amp;db=pubmed&amp;nlmid=101554926"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="23308034"
><span class="text">
Free PMC article
</span></a>
</div>
</div>
<div class="short-view">
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
Full text links
</a>
</div>
</div>
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
aria-label="Open dialog with citation text in different styles"
data-ga-category="save_share"
data-ga-action="cite"
data-ga-label="open"
data-all-citations-url="/23308034/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/23308034/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="23308034" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
aria-label="Save article in MyNCBI collections."
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_button"
data-collections-open-dialog-enabled="false"
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F23308034%2F%23open-collections-dialog"
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
class="dialog collections-dialog"
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-myncbi-max-collection-name-length="100"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="jYuOrTw7FXE6mUGyO4oX4DqRmTCOf03U8wu15j2pkZjSHYkEFrOUgBV3TnHamez2"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
id="collections-action-dialog-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
id="collections-action-dialog-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_existing"><label for="collections-action-dialog-existing">Add to an existing collection</label></li></ul></div><div class="controls-wrapper"><div class="action-panel-control-wrap new-collections-controls"><label for="collections-action-dialog-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label><input
type="text"
name="add-to-new-collection"
id="collections-action-dialog-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="collections_button"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection"><div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div></div><div class="action-panel-control-wrap existing-collections-controls"><label for="collections-action-dialog-add-to-existing" class="action-panel-label">
Choose a collection:
</label><select id="collections-action-dialog-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="collections_button"
data-ga-action="select_collection"
data-ga-label="($('.collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'"></select><div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br><a href="#">Please try again</a></div></div></div><div class="action-panel-actions"><button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="add">
Add
</button><button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="cancel">
Cancel
</button></div></form></div></div></div></div><button class="more-actions-button more-actions-dialog-trigger"
title="Open dialog with more actions to take"
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A comparative genomic analysis of the recently sequenced human body louse unicellular endosymbiont Candidatus Riesia pediculicola with a reduced genome (582 Kb), revealed that it is the only known organism that might have lost all post-transcriptional base and ribose modifications of the tRNA body, retaining only modifications of the anticodon-stem-loop essential for mRNA decoding. Such a minimal tRNA modification set was not observed in other insect symbionts or in parasitic unicellular bacteria, such as Mycoplasma genitalium (580 Kb), that have also evolved by considerably reducing their genomes. This could be an example of a minimal tRNA modification set required for life, a question that has been at the center of the field for many years, especially for understanding the emergence and evolution of the genetic code.
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Figure 1. Codon/anticodon/tDNA usage for the 20 canonical amino acids in the 14 symbiont genomes and <i>E. coli</i>
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<div class="figure-caption-contents">The 15 genomes investigated are listed at the top. Full names are given in Supplementary Table SS1. Codon usage within each amino acid family decoding boxes is denoted by the letters on the left: “M” corresponds to most frequently used codon and “m” to the least used ones, with “M1” > “M2” > “m1” > “m2”, etc … to indicate decreasing frequency of codon usage. Rightwards arrows indicate a similar codon usage frequency among the 15 genomes. Details about codon usage in each of the 15 bacteria analyzed can be found in Supplemental Table SS2. These were obtained from automatic determination of all non-overlapping ORFs of 100 codons or more. Vertical bars at the left indicate the six codons of Leu, Ser and Arg respectively. The four columns in the center list the amino acids (indicated as “<b>AA</b>”, one- and three-letter code), the codon (“<b>C</b>”) and anticodon (“<b>AC</b>”) at DNA level. Anticodons never used are indicated as “---”. Numbers at the right indicate the number of tRNA genes harboring the respective anticodons found in each bacteria. Dash signs indicate absence of corresponding tRNA gene. tRNA gene search was performed with tRNAscan-SE [59], and the structure of each tRNA was carefully inspected for fit to the earlier defined bacterial-type tRNA cloverleaf structure [35]. Only three cases of tRNAs (underlined) with more nucleotide than expected (+1 nt in the D-loop) were found. None of the tRNA genes were found in plasmids. The key to the color code is: light gray background denotes four-codon family boxes encoding a single amino acid; yellow background for AUA codon read by the special Ile-tRNA (CAU with wobble C34 modified to k<sup>2</sup>C34 in mature tRNA, see text); green background for the unique A34-containing tRNA<sup>Arg</sup> (I34 in mature tRNA, see text); red boxes correspond to quartet decoding mode in which a single tRNA with T34 at the gene level reads the four codons; blue background denotes C-sparing strategy, the corresponding codon being read by a U<sub>34</sub> containing tRNA. The boxes to the right indicate the standard Genetic Code (split in two).</div>
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<p> Figure 2. Prediction of the tRNA modifications… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Figure 2. Prediction of the tRNA modifications present in C. <i> R. pediculicola </i> and comparison with… </p>
</strong>
</div>
<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Figure 2. Prediction of the tRNA modifications present in C. <i>R. pediculicola</i> and comparison with <i>E. coli.</i>
</strong>
<div class="figure-caption-contents">The analysis of the modification genes present in the genome of C. <i>R. pediculicola</i> was performed using the SEED database. We constructed a subsystem containing all known <i>E. coli</i> tRNA modifications genes (see “tRNA modification E. coli” subsystem available on the Public SEED, <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://pubseed.theseed.org/SubsysEditor.cgi">http://pubseed.theseed.org/SubsysEditor.cgi</ext-link>) and extended it to C. <i>R. pediculicola.</i> A manual search of the genome (NC_014109, NC_013962) using BlastP and tBlastN [60] with the <i>E. coli</i> proteins from the “tRNA modification <i>E. coli</i>” subsystem as input was performed. The gene list used is also found in Table 1 of [61] with the addition of the gene encoding TsaA involved in m<sup>6</sup>t<sup>6</sup>A formation (T. Suzuki and V. de Crécy-lagard, personal communication) and TsaD/YgjD involved in t<sup>6</sup>A formation [16]. In <i>E. coli</i>, IscS and TusABCDE are required for thiol transfer [3], but no TusACDE homologs were found in C. <i>R. pediculicola</i> and SufS is the only IscS homolog in this organism. The m<sup>2</sup>A37 methylase encoding gene has not been identified in any organism. The same is true for the acp<sup>3</sup>U47 gene, hence the question marks. We previously predicted <i>yfiF</i> encodes the missing methylase [62], but this has not been experimentally validated. No <i>yfiF</i> homolog or no other methylase of unknown function could be identified in the C. <i>R. pediculicola</i> genome, making the presence of m<sup>2</sup>A37 in this organism unlikely. Finally, to make sure no other genes had been missed, all known tRNA modification genes from <i>B. subtilis</i> and <i>S. cerevisiae</i> were queried in C. <i>R. pediculicola</i> (using the subsystems “tRNA modification Bacteria”, “tRNA modification yeast cytoplasmic” and “tRNA modification yeast mitochondrial” [63]). The genes present in C. <i>R. pediculicola</i> are listed in the dashed boxes, with prediction of the resulting modification. Assuming that gene products in C. <i>R. pediculicola</i> exhibit the same specificity as the <i>E. coli</i> homologs, one can predict which modifications are found in the 33 tRNAs of the symbiont. They are all localized in the anticodon loop and proximal stem (indicated by numbered grey circles, the whole cluster of modified nucleotides being encircled by dashed line). Only acp<sup>3</sup>U, normally present at position 47, cannot be excluded because the gene coding for the corresponding enzyme is unknown. For the same reason, it is not certain if m<sup>2</sup>A37 is present. For comparison, the same tRNA cloverleaf is shown with all the modified nucleotides identified so far by sequencing the 37 fully mature <i>E. coli</i> tRNA, as indicated in Figure 1 (only 4 isoacceptor tRNA remain to be sequenced, see Figure 4). The modified nucleotides common to both bacteria are indicated in black, while the ones found only in <i>E. coli</i> are indicated in grey. In brackets, the number of isoacceptor tRNAs containing a given modification is indicated. When this number is low, the identity of the modified tRNA is also indicated using the one letter code for amino acid. Open circles correspond to positions in <i>E. coli</i> tRNAs where no modification has been found. This compilation was adapted from previously published data [2, 3]. Full names for the different acronyms used to define a given modified base can be found in the MODOMICS database [1].</div>
</figcaption>
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itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="800"
data-image-height="489"
data-image-alt="Figure 3"
data-pmc-id="PMC3539174"
data-figure-id="F3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f91/3539174/887918a4bdcf/nihms385606f3.gif"
alt="Figure 3" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="800">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="489">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Figure 3. Prediction of tRNA modifications present… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Figure 3. Prediction of tRNA modifications present in insect symbionts </p>
</strong>
<div class="figure-caption-contents"><p> A signature gene was chosen… </p></div>
</div>
<figcaption id="figure-caption-2" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Figure 3. Prediction of tRNA modifications present in insect symbionts
</strong>
<div class="figure-caption-contents">A signature gene was chosen for every modification and the distribution of the genes analyzed in all genomes listed in Figure 1 by adding them to the “tRNA_modification_<i>E._coli</i>” subsystem on the Public SEED server. Only the genes that were found in at least one of the genomes analyzed other than <i>E. coli</i> are shown, with the exception of the ones responsible for m<sup>2</sup>A37 and acp<sup>3</sup>U47 modifications that have yet to be identified in <i>E. coli</i>. Grey boxes denote genes present in all genomes analyzed. Black boxes denote genes present in <i>E. coli</i> and in some of the symbiotic genomes. White boxes denote that a specific gene is missing in a specific organism.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="3"
data-label-slug="figure-4">
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itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="498"
data-image-height="644"
data-image-alt="Figure 4"
data-pmc-id="PMC3539174"
data-figure-id="F4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f91/3539174/500af9fb7dcc/nihms385606f4.gif"
alt="Figure 4" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="498">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="644">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Figure 4. Comparative decoding strategies of C.… </p>
</strong>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Figure 4. Comparative decoding strategies of C. <i> Riesia pediculicola </i> and <i> E. coli. </i> </p>
</strong>
<div class="figure-caption-contents"><p> In the standard… </p></div>
</div>
<figcaption id="figure-caption-3" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Figure 4. Comparative decoding strategies of C. <i>Riesia pediculicola</i> and <i>E. coli.</i>
</strong>
<div class="figure-caption-contents">In the standard genetic code, each decoding box contains information about identity of nucleotides present in the anticodon loop and proximal stem, as illustrated in the decoding box corresponding to codons UAA/UAG (labeled in figure as “Extended anticodon”). Shown are the nucleotides at positions 32, the three anticodon bases (3436) and nucleotide-37 (both in grey background) and the sequence of nucleotide 3840. On the right side of each decoding box, is listed the information for <i>E. coli</i> isoacceptor tRNAs obtained from the tRNA data banks [2, 3]. On the left side of each decoding box, is listed the information for the homologous C. <i>R. pediculicola</i> (Riesia) isoacceptor tRNAs. The identities of the nucleotides were obtained directly from the tRNA gene analysis (this work, Figure 1), while the presence of modified nucleotides was deduced by combining knowledge from the analysis done in Figure 2 with the known modifications at identical positions in the corresponding <i>E. coli</i> tRNAs. The color code is as in Figure 1. In dark green background, are the only four mature tRNAs in <i>E. coli</i> that have not yet been sequenced, only the sequence of the corresponding genes are known. Differences between the two sets of bacterial isoacceptor species are highlighted by red letters. The exact chemical nature of the hypermodified m<sup>1</sup>G?37 in <i>E. coli</i> tRNA<sup>Leu</sup> is not known [3], so only the m<sup>1</sup>G moiety was indicated for the insect symbiont tRNA. Also the presence of m<sup>2</sup>A37 in C. <i>R. pediculicola</i> is questionable (see Figure 2 legend) and indicated as ?m<sup>2</sup>A.</div>
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