Skip to Main content Skip to Navigation
Journal articles

A pure familial 6q15q21 split duplication associated with obesity and transmitted with partial reduction

Abstract : Familial transmission of chromosome 6 duplications is rare. We report on the first observation of a maternally-inherited pure segmental 6q duplication split into two segments, 6q15q16.3 and 6q16.3q21, and associated with obesity. Obesity has previously been correlated to chromosome 6 q-arm deletion but has not yet been assessed in duplications. The aim of this study was to characterize the structure of these intrachromosomal insertional translocations by classic cytogenetic banding, array-CGH, FISH, M-banding and genotyping using microsatellites and SNP array analysis, in a mother and four offspring. The duplicated 6q segments, 9.75 Mb (dup 1) and 7.05 Mb (dup 2) in size in the mother, were inserted distally into two distinct chromosome 6q regions. They were transmitted to four offspring. A son and a daughter inherited the two unbalanced insertions and displayed, like the mother, an abnormal phenotype with facial dysmorphism, intellectual disability, and morbid obesity. Curiously, two daughters with a normal phenotype inherited only the smaller segment, 6q16.3q21. The abnormal phenotype was associated with the larger proximal 6q15q16.3 duplication. We hypothesize a mechanism for this exceptional phenomenon of recurrent reduction and transmission of the duplication during meiosis in a family. We expect the interpretation of our findings to be useful for genetic counseling and for understanding the mechanisms underlying these large segmental 6q duplications and their evolution.
Document type :
Journal articles
Complete list of metadata

https://hal.univ-lorraine.fr/hal-01667345
Contributor : Ngere Ul Connect in order to contact the contributor
Submitted on : Tuesday, December 19, 2017 - 11:55:21 AM
Last modification on : Tuesday, October 19, 2021 - 10:28:57 PM

Links full text

Identifiers

Citation

Emilie Landais, Camille Leroy, Pascale Kleinfinger, Stéphanie Brunet, Valérie Koubi, et al.. A pure familial 6q15q21 split duplication associated with obesity and transmitted with partial reduction. American Journal of Medical Genetics Part A, Wiley, 2015, 167 (6), pp.1275 - 1284. ⟨10.1002/ajmg.a.36995⟩. ⟨hal-01667345⟩

Share

Metrics

Record views

185