Format

Send to:

Choose Destination
See comment in PubMed Commons below
Am J Hum Genet. 2013 Mar 7;92(3):439-47. doi: 10.1016/j.ajhg.2013.01.018. Epub 2013 Feb 28.

Enhanced maternal origin of the 22q11.2 deletion in velocardiofacial and DiGeorge syndromes.

Author information

  • 1Departments of Genetics, Pediatrics, and Obstetrics & Gynecology and Women's Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Erratum in

  • Am J Hum Genet. 2013 Apr 4;92(4):637. Jarlbrzkowski, Maria [corrected to Jalbrzikowski, Maria].

Abstract

Velocardiofacial and DiGeorge syndromes, also known as 22q11.2 deletion syndrome (22q11DS), are congenital-anomaly disorders caused by a de novo hemizygous 22q11.2 deletion mediated by meiotic nonallelic homologous recombination events between low-copy repeats, also known as segmental duplications. Although previous studies exist, each was of small size, and it remains to be determined whether there are parent-of-origin biases for the de novo 22q11.2 deletion. To address this question, we genotyped a total of 389 DNA samples from 22q11DS-affected families. A total of 219 (56%) individuals with 22q11DS had maternal origin and 170 (44%) had paternal origin of the de novo deletion, which represents a statistically significant bias for maternal origin (p = 0.0151). Combined with many smaller, previous studies, 465 (57%) individuals had maternal origin and 345 (43%) had paternal origin, amounting to a ratio of 1.35 or a 35% increase in maternal compared to paternal origin (p = 0.000028). Among 1,892 probands with the de novo 22q11.2 deletion, the average maternal age at time of conception was 29.5, and this is similar to data for the general population in individual countries. Of interest, the female recombination rate in the 22q11.2 region was about 1.6-1.7 times greater than that for males, suggesting that for this region in the genome, enhanced meiotic recombination rates, as well as other as-of-yet undefined 22q11.2-specific features, could be responsible for the observed excess in maternal origin.

Copyright © 2013 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

PMID:
23453669
[PubMed - indexed for MEDLINE]
PMCID:
PMC3591861
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science Icon for PubMed Central
    Loading ...
    Write to the Help Desk