Heterogeneity of the epsilon gamma delta beta-thalassaemias: characterization of three novel English deletions

We have characterized three novel epsilon gamma delta beta-thalassaemia deletions in three English families. Two of the deletions, 114 and 439 kb, removed the entire beta-globin gene complex, including a variable number of flanking olfactory receptor (HOR) genes. The 98-kb deletion extended 90-kb up...

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Bibliographic Details
Published in:British journal of haematology 2005-03, Vol.128 (5), p.722
Main Authors: Rooks, Helen, Bergounioux, Jean, Game, Laurence, Close, James Paul, Osborne, Cameron, Best, Steve, Senior, Tania, Height, Susan, Thompson, Richard, Hadzic, Nedim, Fraser, Peter, Bolton-Maggs, Paula, Thein, Swee Lay
Format: Article
Language:English
Subjects:
Anemia, Hemolytic, Congenital - classification
Anemia, Hemolytic, Congenital - genetics
beta-Thalassemia - classification
beta-Thalassemia - genetics
Child
Gene Deletion
Globins - genetics
Heterozygote
Humans
Infant, Newborn
Male
Sequence Analysis, DNA
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Summary:We have characterized three novel epsilon gamma delta beta-thalassaemia deletions in three English families. Two of the deletions, 114 and 439 kb, removed the entire beta-globin gene complex, including a variable number of flanking olfactory receptor (HOR) genes. The 98-kb deletion extended 90-kb upstream of the epsilon gene to 8 kb upstream of the G gamma-gene, leaving the gamma,delta and beta-genes intact. The 439 kb deletion is the largest deletion reported so far to cause epsilon gamma delta beta-thalassaemia; heterozygotes for this deletion were variably affected by neonatal haemolytic anaemia. Two of the deletions were de novo. Breakpoints of all three deletions occurred within regions of L1 or Alu repeats and contained short regions of direct homology between the flanking sequences, a feature that is likely to have contributed to the illegitimate recombinations.
ISSN:0007-1048
1365-2141
DOI:10.1111/j.1365-2141.2005.05368.x