The crucial role of titin in fetal development: recurrent miscarriages and bone, heart and muscle anomalies characterise the severe end of titinopathies spectrum.
J Med Genet
; 60(9): 866-873, 2023 09.
Article
in En
| MEDLINE
| ID: mdl-36977548
BACKGROUND: Titin truncating variants (TTNtvs) have been associated with several forms of myopathies and/or cardiomyopathies. In homozygosity or in compound heterozygosity, they cause a wide spectrum of recessive phenotypes with a congenital or childhood onset. Most recessive phenotypes showing a congenital or childhood onset have been described in subjects carrying biallelic TTNtv in specific exons. Often karyotype or chromosomal microarray analyses are the only tests performed when prenatal anomalies are identified. Thereby, many cases caused by TTN defects might be missed in the diagnostic evaluations. In this study, we aimed to dissect the most severe end of the titinopathies spectrum. METHODS: We performed a retrospective study analysing an international cohort of 93 published and 10 unpublished cases carrying biallelic TTNtv. RESULTS: We identified recurrent clinical features showing a significant correlation with the genotype, including fetal akinesia (up to 62%), arthrogryposis (up to 85%), facial dysmorphisms (up to 73%), joint (up to 17%), bone (up to 22%) and heart anomalies (up to 27%) resembling complex, syndromic phenotypes. CONCLUSION: We suggest TTN to be carefully evaluated in any diagnostic process involving patients with these prenatal signs. This step will be essential to improve diagnostic performance, expand our knowledge and optimise prenatal genetic counselling.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Abortion, Habitual
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Muscle, Skeletal
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Connectin
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Myocardium
Type of study:
Observational_studies
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Risk_factors_studies
Limits:
Female
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Humans
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Pregnancy
Language:
En
Journal:
J Med Genet
Year:
2023
Document type:
Article
Affiliation country:
Italy
Country of publication:
United kingdom