scholarly journals Novel Pathogenic Mutation Mapping of ASPM Gene in Consanguineous Pakistani Families with Primary Microcephaly

2023 ◽  
Vol 83 ◽  
Author(s):  
T. Batool ◽  
S. Irshad ◽  
K. Mahmood
Keyword(s):  
Novel Mutation ◽  
Neurodevelopmental Disorder ◽  
Pathogenic Mutation ◽  
Primary Microcephaly ◽  
Salting Out ◽  
Remote Areas ◽  
Calmodulin Binding ◽  
Whole Exome ◽  
Autosomal Recessive Primary Microcephaly ◽  
Pakistani Families

Abstract Autosomal recessive primary microcephaly (MCPH) is a neurodevelopmental disorder characterized by a congenitally reduced head circumference (-3 to -5 SD) and non-progressive intellectual disability. The objective of the study was to evaluate pathogenic mutations in the ASPM gene to understand etiology and molecular mechanism of primary microcephaly. Blood samples were collected from various families across different remote areas of Pakistan from February 2017 to May 2019 who were identified to be affected with primary microcephaly. DNA extraction was performed using the salting-out method; the quality and quantity of DNA were evaluated using spectrophotometry and 1% agarose gel electrophoresis, respectively in University of the Punjab. Mutation analysis was performed by whole exome sequencing from the Cologne Center for Genomics, University of Cologne. Sanger sequencing was done in University of the Punjab to confirm the pathogenic nature of mutation. A novel 4-bp deletion mutation c.3877_3880delGAGA was detected in exon 17 of the ASPM gene in two primary microcephaly affected families (A and B), which resulted in a frame shift mutation in the gene followed by truncated protein synthesis (p.Glu1293Lysfs*10), as well as the loss of the calmodulin-binding IQ domain and the Armadillo-like domain in the ASPM protein. Using the in-silico tools Mutation Taster, PROVEAN, and PolyPhen, the pathogenic effect of this novel mutation was tested; it was predicted to be “disease causing,” with high pathogenicity scores. One previously reported mutation in exon 24 (c.9730C>T) of the ASPM gene resulting in protein truncation (p.Arg3244*) was also observed in family C. Mutations in the ASPM gene are the most common cause of MCPH in most cases. Therefore, enrolling additional affected families from remote areas of Pakistan would help in identifying or mapping novel mutations in the ASPM gene of primary microcephaly.

scholarly journals Whole exome sequencing identifies a novel mutation in ASPM and ultra-rare mutation in CDK5RAP2 causing Primary microcephaly in consanguineous Pakistani families

2021 ◽  
Vol 38 (1) ◽  
Author(s):  
Ehtisham ul Haq Makhdoom ◽  
Haseeb Anwar ◽  
Shahid Mahmood Baig ◽  
Ghulam Hussain
Keyword(s):  
Intellectual Disability ◽  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Novel Mutation ◽  
Speech Impairment ◽  
Primary Microcephaly ◽  
Rare Mutation ◽  
Homozygous Variant ◽  
Whole Exome ◽  
Pakistani Families

Background & Objectives: Primary Microcephaly (MCPH) is a rare neurogenetic disease, manifesting congenitally reduced head circumference and non-progressive intellectual disability (ID). To date, twenty-eight genes with biallelic mutations have been reported for this disorder. The study aimed for molecular genetic characterization of Pakistani families segregating MCPH. Methods: We studied two unrelated consanguineous families (family A and B) presenting >2 patients with diagnostic symptoms of MCPH, born to asymptomatic parents. We employed whole-exome sequencing (WES) of probands to find putative causal mutations. The candidate variants were further confirmed and analyzed for co-segregation by Sanger sequencing of all available members of each family. This study was conducted at Government College University, Faisalabad, Pakistan, and Cologne Center for Genomics (CCG), University of Cologne, Germany; during 2017-2020. Results: We identified a novel homozygous variant c.10097_10098delGA, p.(Gly3366Glufs*19) in exon 26 of ASPM gene in family A which presents with moderate intellectual disability, speech impairment, visual abnormalities, seizures, and ptyalism. Family B was found to segregate nonsense, homozygous variant c.448C>T p.(Arg150*) in CDK5RAP2. The patients also exhibited mild to severe seizures without ptyalism that has not been previously reported in patients with mutations in the CDK5RAP2 gene. Conclusion: We report a novel mutation in ASPM and ultra-rare mutation in the CDK5RAP2 gene, both causing primary microcephaly. The study expands the mutational spectrum of the ASPM gene to 212, and also adds to the clinical spectrum of CDK5RAP2 mutations. It also demonstrated the utility of WES in the investigation and genetic diagnosis of genetically heterogeneous disorders like MCPH. These findings would aid in diagnostic and preventive strategies including carrier screening, cascade testing, and genetic counselling. doi: https://doi.org/10.12669/pjms.38.1.4464 How to cite this:Makhdoom EH, Anwar H, Baig SM, Hussain G. Whole exome sequencing identifies a novel mutation in ASPM and ultra-rare mutation in CDK5RAP2 causing Primary microcephaly in consanguineous Pakistani families. Pak J Med Sci. 2022;38(1):---------.  doi: https://doi.org/10.12669/pjms.38.1.4464 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

A Novel Frameshift Mutation in Abnormal Spindle-Like Microcephaly (ASPM) Gene in an Iranian Patient with Primary Microcephaly: A Case Report

2020 ◽  
Author(s):  
Afsaneh BAZGIR ◽  
Mehdi AGHA GHOLIZADEH ◽  
Faezeh SARVAR ◽  
Zahra PAKZAD
Keyword(s):  
Intellectual Disability ◽  
Frameshift Mutation ◽  
Genetic Disorder ◽  
Normal Function ◽  
Molecular Testing ◽  
Homozygous Mutation ◽  
Primary Microcephaly ◽  
Iranian Patient ◽  
Whole Exome ◽  
Autosomal Recessive Primary Microcephaly

Autosomal recessive primary microcephaly (MCPH) is a rare genetic disorder, leading to the defect of neurogenic brain development. Individuals with MCPH reveal reduced head circumference and intellectual disability. Several MCPH loci have been identified from several populations. Genetic heterogeneity of this disorder represents molecular testing challenge. An 8 yr old female, born from consanguineous parents, was attended to Fardis Central Lab, Alborz, Iran. Based on the reduced circumference and intellectual disability, MCPH was diagnosed. Whole exome sequencing of the patient identified a novel homozygous frameshift mutation (c.2738dupT, p.Cys914fs) in exon 9 Abnormal Spindle-like Microcephaly )ASPM( gene. By Sanger sequencing, segregation analysis showed that both parents were heterozygous carriers for this variant. The novel frameshift mutation likely truncates the protein, resulting in loss of normal function ASPM in homozygous mutation carriers. The study might add a new pathogenic variant in mutations of the ASPM gene as a causative variant in patients with MCPH and might be helpful in genetic counseling of consanguineous families.

scholarly journals Mutations in WDR62 gene in Pakistani families with autosomal recessive primary microcephaly

BMC Neurology ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Rizwana Kousar ◽  
Muhammad Jawad Hassan ◽  
Bushra Khan ◽  
Sulman Basit ◽  
Saqib Mahmood ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Primary Microcephaly ◽  
Autosomal Recessive Primary Microcephaly ◽  
Pakistani Families

Autosomal Recessive Primary Microcephaly (MCPH): An Update

2017 ◽  
Vol 48 (03) ◽  
pp. 135-142 ◽  
Author(s):  
Deborah Morris-Rosendahl ◽  
Angela Kaindl ◽  
Sami Zaqout
Keyword(s):  
Intellectual Disability ◽  
Head Circumference ◽  
Autosomal Recessive ◽  
Neurodevelopmental Disorder ◽  
Speech Disorder ◽  
Rare Disorder ◽  
Primary Microcephaly ◽  
Expressive Speech ◽  
Autosomal Recessive Primary Microcephaly

AbstractAutosomal recessive primary microcephaly (MCPH; MicroCephaly Primary Hereditary) is a genetically heterogeneous neurodevelopmental disorder characterized by a significantly reduced head circumference present already at birth and intellectual disability. Inconsistent features include hyperactivity, an expressive speech disorder, and epilepsy. Here, we provide a brief overview on this rare disorder pertinent for clinicians.

scholarly journals Clinical Whole-Exome Sequencing Analysis Reveals a Novel Missense COL11A1 Mutation Resulting in an 18-Week Iranian Male Aborted Fetus with Fibrochondrogenesis 1: A Case Report

2021 ◽  
Author(s):  
Hanifeh Mirtavoos-Mahyari ◽  
Sanaz Ajami ◽  
Amirhosein Mehrtash ◽  
Seyedeh Mahya Marashiyan ◽  
Farbod Bahreini ◽  
...  
Keyword(s):  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Novel Mutation ◽  
Missense Variant ◽  
Pathogenic Mutation ◽  
Sequencing Analysis ◽  
Gene Encoding ◽  
Protein Levels ◽  
Proper Role ◽  
Whole Exome

Abstract BackgroundFibrochondrogenesis 1, an autosomal recessive syndrome, is an infrequent and rare disease, causing short-limbed skeletal dysplasia. This syndrome is clinically characterized and distinguished by a small nose and anteverted bares, flat midface, shortened long bones, and a protuberant abdomen. Mutations in the gene encoding the α1 chain of type XI collagen (COL11A1) are seen to be the main cause of this disease.Case PresentationWe present an 18-week Iranian male aborted fetus with Fibrochondrogenesis 1 from consanguineous parents. Whole-exome sequencing (WES) revealed a novel missense variant from G to A in exon 45 of 68 in the COL11A1 gene (NM_080629.2: c.3440G>A, [p.G1147E, g.103404625]). The mutation was confirmed by Sanger sequencing and further, MutationTaster predicted this variant to be disease-causing.ConclusionBioinformatic analysis suggests that this variant is highly conserved in both nucleotide and protein levels, suggesting that it has an important function in the proper role of COL11A1 protein. In-silico analysis suggests that this mutation alters the COL11A1 protein structure through a Glycine to Glutamic acid substitution. This is a novel mutation and a rare variant as this variant is not reported in gmomAD, ExAC, or 1000 genome databases.To the best of the authors’ knowledge, this is the first study to report a novel pathogenic mutation in COL11A1 in association with Fibrochondrogenesis 1. Therefore, we suggest that WES can be used as a robust method to achieve rapid diagnosis and identification of pathogenic and novel mutations in patients.

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.

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