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Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...

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Comprehensive DNA Methylation Analysis Using a Methyl-CpG-binding Domain Capture-based Method in Chronic Lymphocytic Leukemia Patients
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Published on: June 16, 2017

MLH1 methylation screening is effective in identifying epimutation carriers.

Marta Pineda1, Pilar Mur, María Dolores Iniesta

  • 1Hereditary Cancer Program, Catalan Institute of Oncology, ICO-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.

European Journal of Human Genetics : EJHG
|July 6, 2012
PubMed
Summary

Constitutional MLH1 epimutations were identified in 5.9% of Lynch syndrome patients with MLH1-methylated tumors. This finding aids in identifying carriers of this heritable condition, even without a family history.

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Area of Science:

  • Genetics
  • Oncology
  • Epigenetics

Background:

  • Lynch syndrome (LS) is a hereditary cancer predisposition syndrome.
  • Constitutional MLH1 epimutations are a newly identified cause of LS.
  • Identifying carriers is crucial for genetic counseling and management.

Purpose of the Study:

  • To identify patients with constitutional MLH1 epimutations among those suspected of having LS.
  • To investigate the prevalence and characteristics of MLH1 epimutations in a specific patient cohort.

Main Methods:

  • Analyzed MLH1 promoter methylation in lymphocyte DNA using MS-MLPA.
  • Confirmed constitutional MLH1 methylation with bisulfite sequencing and pyrosequencing.
  • Assessed allelic expression and vertical transmission of methylation.

Main Results:

  • Detected constitutional MLH1 methylation in 2 of 34 patients (5.9%) with suspected LS and MLH1-methylated tumors.
  • Both identified carriers developed early-onset LS tumors without a family history.
  • Demonstrated maternal transmission and reversal of methylation in one case.

Conclusions:

  • MLH1 methylation screening in lymphocyte DNA can identify epimutation carriers.
  • Soma-wide MLH1 epimutation is an emerging heritable entity.
  • This study provides further evidence for the significance of MLH1 epimutations in LS.