Publications by authors named "Michael Bjorn Petersen"

Numerous rearrangements in the 8p23 chromosomal region have been reported; included in these rearrangements are isolated deletions in this area. Such deletions are associated with a wide range of phenotypic characteristics, including motor impairment, epilepsy, intellectual disability, cardiac defects and seizures. The present study describes the case of a 30-year-old asymptomatic man that carries a deletion in 8p23.

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Background: Doyne honeycomb retinal dystrophy (DHRD)/malattia leventinese (ML) is an autosomal dominant, progressive retinal disorder characterized by massive central retinal drusen often partly coalescent forming a characteristic honeycomb-like pattern. Debut of vision loss often occurs in early to mid-adulthood, and the degree varies. A single variant in EFEMP1: c.

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Background: CABP2-related non-syndromic hearing loss have only been reported in a few families worldwide (Iran, Turkey, Pakistan and Italy). The hearing loss was in these cases described as prelingual, symmetrical, and moderate to severe.

Methods: Following DNA isolation, exome sequencing was performed in 123 genes related to non-syndromic hearing loss.

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Background: Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, also referred to as Müllerian aplasia, is a congenital disorder characterized by aplasia of the uterus and upper part of the vagina in females with normal secondary sex characteristics and a normal female karyotype (46,XX).

Main Body: The diagnosis is often made during adolescence following investigations for primary amenorrhea and has an estimated prevalence of 1 in 5000 live female births. MRKH syndrome is classified as type I (isolated uterovaginal aplasia) or type II (associated with extragenital manifestations).

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Biallelic variants in HARS2 have been associated with Perrault syndrome, characterized by sensorineural hearing impairment and premature ovarian insufficiency. Here we report three novel families, compound heterozygous for missense variants in HARS2 identified by next-generation sequencing, namely c.172A > G (p.

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Objectives: The mitochondrial DNA (mtDNA) point mutation m.3243A>G is known to express the following two syndromes among others: maternally inherited diabetes and deafness (MIDD) and mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS). Sensorineural hearing loss (SNHL) is the most frequent symptom in individuals harboring the m.

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Objective: To compare the long-term anatomical outcome and complications in treatments of vaginal agenesis in Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome.

Design: A historical comparative follow-up study using medical chart reviews.

Setting: Public hospitals.

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In Denmark, preimplantation genetic diagnosis (PGD) is offered within the public healthcare to families with a known risk of an inherited disease in a child - as an alternative to prenatal diagnosis. It is a well-established technique with rather well-described perinatal- and neonatal outcomes, being comparable to what is seen following in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI). The most common strategy is now to perform trophectoderm biopsy and then vitrify, while the diagnostic test is performed.

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Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome is a congenital anomaly characterized by uterovaginal agenesis in females with normal secondary sex characteristics and normal karyotype (46,XX). The prevalence of MRKH syndrome is one in 5,000 live female births as recently confirmed by a nationwide population-based study in Denmark. This review kaleidoscopically summarizes the current knowledge of the history, genetics, diagnostics, treatment of vaginal agenesis, psychosexual aspects, and fertility options in MRKH syndrome.

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Study Question: What is the prevalence of Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome?

Summary Answer: The prevalence of MRKH syndrome in Denmark is 1 in 4982 (95% confidence interval (CI): 4216-5887) live female births.

What Is Known Already: The prevalence of MRKH syndrome has been estimated to be around 1 in 4000-5000 females. However, population-based prevalence studies of MRKH syndrome are sparse.

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Background: Whereas mutations affecting the helical domain of type I procollagen classically cause Osteogenesis Imperfecta (OI), helical mutations near the amino (N)-proteinase cleavage site have been suggested to result in a mixed OI/Ehlers-Danlos syndrome (EDS)-phenotype.

Methods: We performed biochemical and molecular analysis of type I (pro-) collagen in a cohort of seven patients referred with a clinical diagnosis of EDS and showing only subtle signs of OI. Transmission electron microscopy of the dermis was available for one patient.

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Objective: Evaluate the results obtained from Quantitative Fluorescent (QF)-PCR and conventional karyotype analysis to determine the advantages and disadvantages of dual testing in prenatal diagnosis.

Methods: From 1 June 2006 to 1 June 2010, dual testing by QF-PCR and karyotype analysis was performed in 13,500 prenatal samples. The rates of concordant results between the two methods were evaluated and the rates of clinically significant chromosomal abnormalities undetected by QF-PCR were assessed.

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A high frequency of the Cohen syndrome has been observed in a Greek island with 2,000 inhabitants and a high degree of inbreeding. All patients were homozygous for a COH1, exon 6-16 deletion suggesting a founder effect. We present the results of their first systematic ophthalmologic assessment.

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