Universität zu Köln

Daimagueler, Huelya-Sevcan, Akpulat, Ugur, Oezdemir, Oezkan, Yis, Uluc, Gungor, Serdal, Talim, Beril, Diniz, Gulden, Baydan, Figen, Thiele, Holger, Altmueller, Janine, Nuernberg, Peter and Cirak, Sebahattin (2021). Clinical and genetic characterization of PYROXD1-related myopathy patients from Turkey. Am. J. Med. Genet. A, 185 (6). S. 1678 - 1691. HOBOKEN: WILEY. ISSN 1552-4833

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Abstract

Congenital myopathies (CMs) are a heterogeneous group of inherited muscle disorders characterized by muscle weakness at birth, while limb-girdle muscular dystrophies (LGMD) have a later onset and slower disease progression. Thus, detailed clinical phenotyping of genetically defined disease entities are required for the full understanding of genotype-phenotype correlations. A recently defined myopathic genetic disease entity is caused by bi-allelic variants in a gene coding for pyridine nucleotide-disulfide oxidoreductase domain 1 (PYROXD1) with unknown substrates. Here, we present three patients from two consanguineous Turkish families with mild LGMD, facial weakness, normal CK levels, and slow progress. Genomic analyses revealed a homozygous known pathogenic missense variant (c.464A>G, p.Asn155Ser) in family 1 with two affected females. In the affected male of family 2, we found this variant in a compound heterozygous state together with a novel frameshift variant (c.329_332delTCTG, p.Leu112Valfs*8), which is the second frameshift variant known so far in PYROXD1. We have been able to define a large homozygous region in family 1 sharing a common haplotype with family 2 in the critical region. Our data suggest that c.464A>G is a Turkish founder mutation. To gain deeper insights, we performed a systematic review of all published PYROXD1-related myopathy cases. Our analysis showed that the c.464A > G variant was found in 87% (20/23) of the patients and that it may cause either a childhood- or adult-onset phenotype, irrespective of its presence in a homozygous or compound heterozygous state. Interestingly, only four patients had elevated CK levels (up to 1000 U/L), and cardiac involvement was found in few compound heterozygous cases.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Daimagueler, Huelya-Sevcan UNSPECIFIED UNSPECIFIED UNSPECIFIED Akpulat, Ugur UNSPECIFIED UNSPECIFIED UNSPECIFIED Oezdemir, Oezkan UNSPECIFIED UNSPECIFIED UNSPECIFIED Yis, Uluc UNSPECIFIED UNSPECIFIED UNSPECIFIED Gungor, Serdal UNSPECIFIED UNSPECIFIED UNSPECIFIED Talim, Beril UNSPECIFIED UNSPECIFIED UNSPECIFIED Diniz, Gulden UNSPECIFIED UNSPECIFIED UNSPECIFIED Baydan, Figen UNSPECIFIED UNSPECIFIED UNSPECIFIED Thiele, Holger UNSPECIFIED UNSPECIFIED UNSPECIFIED Altmueller, Janine UNSPECIFIED UNSPECIFIED UNSPECIFIED Nuernberg, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Cirak, Sebahattin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598628
DOI:	10.1002/ajmg.a.62148
Journal or Publication Title:	Am. J. Med. Genet. A
Volume:	185
Number:	6
Page Range:	S. 1678 - 1691
Date:	2021
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1552-4833
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Genetics & Heredity Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59862