ArticleFrontiers in genetics2024
Exome sequence analysis identifies a homozygous, pathogenic, frameshift variant in the
Article in Frontiers in genetics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: α-mannosidosis (MAN) is a rare genetic condition that segregates in an autosomal recessive manner. Lack of lysosomal alpha-mannosidase is the underlying cause of the disease. Symptoms of the disease gradually worsen with the age. Newborns are usually asymptomatic, however, some cases are reported with either congenital ankle equinus or hydrocephalus during the first year. Primary symptoms are characterized by immune deficiency, hearing loss, skeletal abnormalities, progressive mental, motor and speech functions' impairment followed by facial asymmetry. Methods: We studied two Saudi families (A and B) with bilateral moderate hearing loss (family A) and clubfoot with glaucoma (family B). Clinical diagnosis was not reached based on phenotype of patients. Therefore, hypothesis-free whole exome sequencing (WES) was performed on DNA samples from affected individuals of both the families, followed by Sanger sequencing and segregation analysis to validate the segregation of the identified variant. Furthermore, 3D protein modelling was performed to determine the Results: Re-examination of clinical features revealed that the patients in family A have speech delay and hearing impairment along with craniostenosis, whereas the patients from family B have only clubfoot and glaucoma. WES identified a well known pathogenic homozygous frameshift variant (NM_000528.4: c.2402dupG; p.S802fs*129) in Conclusion: Patients in both the families have manifested peculiar set of clinical symptoms associated with α-mannosidosis. Family A manifested partial clinical symptoms missing several characteristic features like intellectual disability, dysmorphic features, neurological and abdominal manifestations, whereas family B has no reported clinical symptoms related to α-mannosidosis except the novel symptoms including club foot and glaucoma which has never been reported earlier The current findings support the evidence that biallelic variants of
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