Diverse clinical outcome of Hunter syndrome in patients with chromosomal aberration encompassing entire and partial IDS deletions: what is important for early diagnosis and counseling?

Abstract:

:Our study aims to delineate the syndromology of Hunter syndrome (MPSII), by presenting three patients with different clinical courses, caused by different genetic mechanisms. Single-nucleotide variants (SNV) or small deletions encompassing the iduronate-2-sulfatase (IDS) gene are identified in the majority of affected individuals, while deletion of contiguous genes or whole IDS gene (described herein) has been reported rarely, mainly in patients with a severe Hunter syndrome presentation. There is; however, lack of reliable genotype-phenotype correlation, especially regarding anthropometric parameters, and thus our understanding of MPSII pathophysiology is not complete. On the basis of our observations, we would like to draw attention to the fact that neurological manifestations observed in patients with contiguous gene deletions, encompassing the IDS gene, may significantly differ from those observed in SNV. The phenotype is; however, difficult to predict and depends on the type (deletion/duplication), size (small/large) of aberration, and gene content. Moreover, it also has implications for genetic counseling, and recurrence risk in those families differs from the usual situation and must be clarified by parental chromosomal studies.

journal_name

Clin Dysmorphol

journal_title

Clinical dysmorphology

authors

Jezela-Stanek A,Pokora P,Młynek M,Smyk M,Ziemkiewicz K,Różdżyńska-Świątkowska A,Tylki-Szymańska A

doi

10.1097/MCD.0000000000000344

subject

Has Abstract

pub_date

2020-12-07 00:00:00

eissn

0962-8827

issn

1473-5717

pub_type

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