scholarly journals Prenatal Identification of a Novel Mutation in the MCPH1 Gene Associated with Autosomal Recessive Primary Microcephaly (MCPH) using Next Generation Sequencing (NGS)

2021 ◽  
Author(s):  
Ioannis Papoulidis ◽  
Makarios Eleftheriades ◽  
Emmanouil Manolakos ◽  
Simoni Maria Liapi ◽  
Anastasia Konstantinidou ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Tandem Repeats ◽  
Novel Mutation ◽  
Homozygous Mutation ◽  
Primary Microcephaly ◽  
Strong Connection ◽  
C Terminus ◽  
Next Generation Sequencing Ngs ◽  
Autosomal Recessive Primary Microcephaly ◽  
Generation Sequencing

MCPH1, otherwise known as the microcephalin gene (*607117) and protein, is a basic regulator of chromosome condensation (BCRT-BRCA1 C-terminus). The Microcephalin protein is made up of three BCRT domains and conserved tandem repeats of interacting phospho-peptide. There is a strong connection between mutations of the MCPH1 and reduced brain growth. Specifically, individuals with such mutations have underdeveloped brains which means smaller size, varying levels of mental retardation, delayed speech and poor language skills, individuals with mild microcephaly and normal intelligence notwithstanding. In this case, a fetus with novel homozygous mutation of the MCPH1 gene ((c.348del)), whose parents were recessive heterozygous for (c.348del), displayed severe microcephaly at 22 weeks of gestation. Due to the effect on splice sites in introns, this mutation causes forming of dysfunctional proteins which lack crucial domains of the C-terminus. Our findings portray an association between the new MCPH1 mutation ((c.348del)) and the clinical features of autosomal recessive primary microcephaly (MCPH) contributing to a broader spectrum related to these pathologies.

scholarly journals Cone Dystrophy in Patient with HomozygousRP1L1Mutation

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Sachiko Kikuchi ◽  
Shuhei Kameya ◽  
Kiyoko Gocho ◽  
Said El Shamieh ◽  
Keiichiro Akeo ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Cone Dystrophy ◽  
Homozygous Mutation ◽  
Full Field ◽  
Clinical Evaluations ◽  
Normal Visual Acuity ◽  
Severe Reduction ◽  
Next Generation Sequencing Ngs ◽  
Generation Sequencing ◽  
Cone Density

The purpose of this study was to determine whether an autosomal recessive cone dystrophy was caused by a homozygousRP1L1mutation. A family including one subject affected with cone dystrophy and four unaffected members without evidence of consanguinity underwent detailed ophthalmic evaluations. The ellipsoid and interdigitation zones on the spectral-domain optical coherence tomography images were disorganized in the proband. The proband had a reduced amplitude of cone and flicker full-field electroretinograms (ERGs). Focal macular ERGs and multifocal ERGs were severely reduced in the proband. A homozygousRP1L1mutation (c.3628T>C, p.S1210P) was identified in the proband. Family members who were heterozygous for the p.S1210P mutation had normal visual acuity and normal results of clinical evaluations. To investigate other putative pathogenic variant(s), a next-generation sequencing (NGS) approach was applied to the proband. NGS identified missense changes in the heterozygous state of thePCDH15,RPGRIP1, andGPR98genes. None of these variants cosegregated with the phenotype and were predicted to be benign reinforcing the putative pathogenicity of theRP1L1homozygous mutation. The AO images showed a severe reduction of the cone density in the proband. Our findings indicate that a homozygous p.S1210P exchange in theRP1L1gene can cause cone dystrophy.

The utility of reverse phenotyping: a case of lysinuric protein intolerance presented with childhood osteoporosis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Enise Avci Durmusalioglu ◽  
Esra Isik ◽  
Durdugul Ayyildiz Emecen ◽  
Damla Goksen ◽  
Samim Ozen ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Recessive Disorder ◽  
Diagnostic Process ◽  
Homozygous Mutation ◽  
Lysinuric Protein Intolerance ◽  
Case Presentation ◽  
Lysinuric Protein ◽  
Next Generation Sequencing Ngs ◽  
Protein Intolerance ◽  
Generation Sequencing

Abstract Objectives Childhood osteoporosis is often a consequence of a chronic disease or its treatment. Lysinuric protein intolerance (LPI), a rare secondary cause of the osteoporosis, is an autosomal recessive disorder with clinical features ranging from minimal protein intolerance to severe multisystemic involvement. We report a case diagnosed to have LPI using a Next Generation Sequencing (NGS) panel and evaluate the utility of reverse phenotyping. Case presentation A fifteen-year-old-boy with an initial diagnosis of osteogenesis imperfecta, was referred due to a number of atypical findings accompanying to osteoporosis such as splenomegaly and bicytopenia. A NGS panel (TruSight One Sequencing Panel) was performed and a novel homozygous mutation of c.257G>A (p.Gly86Glu) in the SLC7A7 gene (NM_001126106.2), responsible for LPI, was detected. The diagnosis was confirmed via reverse phenotyping. Conclusions Reverse phenotyping using a multigene panel shortens the diagnostic process.

scholarly journals A missense mutation in the PISA domain of HsSAS-6 causes autosomal recessive primary microcephaly in a large consanguineous Pakistani family

2014 ◽  
Vol 23 (22) ◽  
pp. 5940-5949 ◽  
Author(s):  
Muzammil A. Khan ◽  
Verena M. Rupp ◽  
Meritxell Orpinell ◽  
Muhammad S. Hussain ◽  
Janine Altmüller ◽  
...  
Keyword(s):  
Missense Mutation ◽  
Autosomal Recessive ◽  
Pakistani Family ◽  
Primary Microcephaly ◽  
Autosomal Recessive Primary Microcephaly

Mutation Analysis of the ASPM Gene in 18 Pakistani Families With Autosomal Recessive Primary Microcephaly

2009 ◽  
Vol 25 (6) ◽  
pp. 715-720 ◽  
Author(s):  
Rizwana Kousar ◽  
Hira Nawaz ◽  
Maryam Khurshid ◽  
Ghazanfer Ali ◽  
Saad Ullah Khan ◽  
...  
Keyword(s):  
Mutation Analysis ◽  
Autosomal Recessive ◽  
Primary Microcephaly ◽  
Autosomal Recessive Primary Microcephaly ◽  
Pakistani Families

Genetic studies of autosomal recessive primary microcephaly in 33 Pakistani families: novel sequence variants in ASPM gene

Neurogenetics ◽  
2006 ◽  
Vol 7 (2) ◽  
pp. 105-110 ◽  
Author(s):  
Asma Gul ◽  
Muhammad Jawad Hassan ◽  
Saqib Mahmood ◽  
Wenje Chen ◽  
Safa Rahmani ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Sequence Variants ◽  
Primary Microcephaly ◽  
Genetic Studies ◽  
Autosomal Recessive Primary Microcephaly ◽  
Pakistani Families

scholarly journals Whole exome sequencing identifies a novel homozygous frameshift mutation in the ASPM gene, which causes microcephaly 5, primary, autosomal recessive

F1000Research ◽  
2017 ◽  
Vol 6 ◽  
pp. 2163
Author(s):  
Desaraju Suresh Bhargav ◽  
N. Sreedevi ◽  
N. Swapna ◽  
Soumya Vivek ◽  
Srinivas Kovvali
Keyword(s):  
Exome Sequencing ◽  
Autosomal Recessive ◽  
Frameshift Mutation ◽  
Protein Gene ◽  
Single Gene ◽  
Primary Microcephaly ◽  
Sequencing Technologies ◽  
Whole Exome ◽  
The Family ◽  
Autosomal Recessive Primary Microcephaly

Microcephaly is a genetically heterogeneous disorder and is one of the frequently notable conditions in paediatric neuropathology which exists either as a single entity or in association with other co-morbidities. More than a single gene is implicated in true microcephaly and the list is growing with the recent advancements in sequencing technologies. Using massive parallel sequencing, we identified a novel frame shift insertion in the abnormal spindle-like microcephaly-associated protein gene in a client with true autosomal recessive primary microcephaly.  Exome sequencing in the present case helped in identifying the true cause behind the disease, which helps in the premarital counselling for the sibling to avoid future recurrence of the disorder in the family.

scholarly journals CDK5RAP2 Is a Pericentriolar Protein That Functions in Centrosomal Attachment of the γ-Tubulin Ring Complex

2008 ◽  
Vol 19 (1) ◽  
pp. 115-125 ◽  
Author(s):  
Ka-Wing Fong ◽  
Yuk-Kwan Choi ◽  
Jerome B. Rattner ◽  
Robert Z. Qi
Keyword(s):  
Autosomal Recessive ◽  
Macromolecular Complex ◽  
Mitotic Spindles ◽  
Microtubule Nucleation ◽  
Primary Microcephaly ◽  
Conserved Sequence ◽  
Ring Complex ◽  
Pericentriolar Material ◽  
Related Proteins ◽  
Autosomal Recessive Primary Microcephaly

Microtubule nucleation and organization by the centrosome require γ-tubulin, a protein that exists in a macromolecular complex called the γ-tubulin ring complex (γTuRC). We report characterization of CDK5RAP2, a novel centrosomal protein whose mutations have been linked to autosomal recessive primary microcephaly. In somatic cells, CDK5RAP2 localizes throughout the pericentriolar material in all stages of the cell cycle. When overexpressed, CDK5RAP2 assembled a subset of centrosomal proteins including γ-tubulin onto the centrosomes or under the microtubule-disrupting conditions into microtubule-nucleating clusters in the cytoplasm. CDK5RAP2 associates with the γTuRC via a short conserved sequence present in several related proteins found in a range of organisms from fungi to mammals. The binding of CDK5RAP2 is required for γTuRC attachment to the centrosome but not for γTuRC assembly. Perturbing CDK5RAP2 function delocalized γ-tubulin from the centrosomes and inhibited centrosomal microtubule nucleation, thus leading to disorganization of interphase microtubule arrays and formation of anastral mitotic spindles. Together, CDK5RAP2 is a pericentriolar structural component that functions in γTuRC attachment and therefore in the microtubule organizing function of the centrosome. Our findings suggest that centrosome malfunction due to the CDK5RAP2 mutations may underlie autosomal recessive primary microcephaly.

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