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Journal of Human Genetics

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https://www.readbyqxmd.com/read/30018422/a-novel-slc9a1-mutation-causes-cerebellar-ataxia
#1
Kazuhiro Iwama, Hitoshi Osaka, Takahiro Ikeda, Satomi Mitsuhashi, Satoko Miyatake, Atsushi Takata, Noriko Miyake, Shuichi Ito, Takeshi Mizuguchi, Naomichi Matsumoto
The mammalian Na+ /H+ exchanger isoform one (NHE1), encoded by Solute Carrier Family 9, member 1 (SLC9A1), consists of 12 membrane domains and a cytosolic C-terminal domain. NHE1 plays an important role in maintaining intracellular pH homeostasis by exchanging one intracellular proton for one extracellular sodium ion. Mice with a homozygous null mutation in Slc9a1 (Nhe1) exhibited ataxia, recurrent seizures, and selective neuronal cell death. In humans, three unrelated patients have been reported: a patient with a homozygous missense mutation in SLC9A1, c...
July 17, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29980720/a-genealogical-assessment-of-familial-clustering-of-anorectal-malformations
#2
Craig C Teerlink, Ryan Bernhisel, Lisa A Cannon-Albright, Michael D Rollins
Familial recurrence of anorectal malformations (ARMs) has been reported in single institution case series and in two population-based studies. Here, we investigate the familial aggregation of ARMs using well-established, unbiased methods in a population genealogy of Utah. Study subjects included 255 ARM cases identified from among the two largest healthcare providers in Utah with linked genealogy data using International Classification of Diseases, Ninth Revision (ICD-9) diagnosis codes. The genealogical index of familiality (GIF) statistic, which compares the average pair-wise relatedness of cases to sets of matched controls, was used to test excess familial clustering...
July 6, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29976999/genotype-phenotype-correlation-in-becker-muscular-dystrophy-in-chinese-patients
#3
Ruiyi Yuan, Junfei Yi, Zhiying Xie, Yimeng Zheng, Miao Han, Yue Hou, Zhaoxia Wang, Yun Yuan
Large deletions and duplications are the most frequent causative mutations in Becker muscular dystrophy (BMD), but genetic profile varied greatly among reports. We performed a comprehensive molecular investigation in 95 Chinese BMD patients. All patients were divided into three subtypes: normal muscle strength (type 1) in 18 cases, quadriceps myopathy (type 2) in 20 cases, and limb-girdle weakness (type 3) in 57 cases. Nineteen cases (20.0%) had small mutations and 76 cases (80.0%) had major rearrangements, including 67 cases (70...
July 5, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29968795/periodic-breathing-in-patients-with-nalcn-mutations
#4
Danielle K Bourque, David A Dyment, Ian MacLusky, Kristin D Kernohan, Hugh J McMillan
Biallelic mutations in NALCN are responsible for infantile hypotonia with psychomotor retardation and characteristic facies 1 (IHPRF1). Common features of this condition include severe neonatal-onset hypotonia and profound global developmental delay. Given the rarity of this condition, long-term natural history studies are limited. Here, we present a 9-year-old male with a homozygous nonsense mutation in NALCN (c.3910C>T, p.Arg1304X) leading to profound intellectual disability, seizures, feeding difficulties, and significant periodic breathing...
July 3, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29930296/ptch1-isoform-1b-is-the-major-transcript-in-the-development-of-basal-cell-nevus-syndrome
#5
Robbert-Jan C A M Gielen, Marieke G H C Reinders, Hannele K Koillinen, Aimée D C Paulussen, Klara Mosterd, Michel van Geel
Basal cell nevus syndrome (BCNS) is an autosomal dominant disorder most commonly caused by a germline mutation in the PTCH1 gene. PTCH1 is known to have different isoforms with different functional properties and expression patterns among tissues. We detected a novel, pathogenic de novo mutation in PTCH1 isoform 1b (c.114delG) in a BCNS patient. Furthermore, we elucidated the specific expression pattern of PTCH1 isoforms in normal skin, BCC and peripheral blood by studying expression of different PTCH1 isoforms...
June 21, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29925960/robust-imaging-and-gene-delivery-to-study-human-lymphoblastoid-cell-lines
#6
Lachlan A Jolly, Ying Sun, Renée Carroll, Claire C Homan, Jozef Gecz
Lymphoblastoid cell lines (LCLs) have been by far the most prevalent cell type used to study the genetics underlying normal and disease-relevant human phenotypic variation, across personal to epidemiological scales. In contrast, only few studies have explored the use of LCLs in functional genomics and mechanistic studies. Two major reasons are technical, as (1) interrogating the sub-cellular spatial information of LCLs is challenged by their non-adherent nature, and (2) LCLs are refractory to gene transfection...
June 20, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29915213/the-genotypic-and-phenotypic-spectrum-of-pars2-related-infantile-onset-encephalopathy
#7
Xiaomeng Yin, Beisha Tang, Xiao Mao, Jinxin Peng, Sheng Zeng, Yaqin Wang, Hong Jiang, Nan Li
Mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs) are a family of enzymes that play critical roles in protein biosynthesis. Mutations in mt-aaRSs are associated with various diseases. As a member of the mt-aaRS family, PARS2 encoding prolyl-tRNA synthetase 2 was recently shown to be associated with Alpers syndrome and certain infantile-onset neurodegenerative disorders in four patients. Here, we present two patients in a pedigree with early developmental delay, epileptic spasms, delayed myelination combined with cerebellar white matter abnormalities, and progressive cortical atrophy...
June 18, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29915212/novel-mutations-in-the-aldh18a1-gene-in-complicated-hereditary-spastic-paraplegia-with-cerebellar-ataxia-and-cognitive-impairment
#8
Kishin Koh, Hiroyuki Ishiura, Minako Beppu, Haruo Shimazaki, Yuta Ichinose, Jun Mitsui, Satoshi Kuwabara, Shoji Tsuji, Yoshihisa Takiyama
Hereditary spastic paraplegias (HSPs) are characterized by various inherited disorders in which weakness and spasticity of the lower extremities are the predominant symptoms. Recently, HSP caused by ALDH18A1 mutations has been reported as SPG9 with autosomal dominant (SPG9A) and autosomal recessive (SPG9B) transmission. In this study, we obtained clinical and genetic findings in two Japanese families with SPG9B. One family had a novel compound heterozygous mutation (c.1321 C > T/c.1994G > A) in the ALDH18A1 gene...
June 18, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29907875/a-novel-homozygous-missense-mutation-in-the-sh3-binding-motif-of-stambp-causing-microcephaly-capillary-malformation-syndrome
#9
Ikumi Hori, Fuyuki Miya, Yutaka Negishi, Ayako Hattori, Naoki Ando, Keith A Boroevich, Nobuhiko Okamoto, Mitsuhiro Kato, Tatsuhiko Tsunoda, Mami Yamasaki, Yonehiro Kanemura, Kenjiro Kosaki, Shinji Saitoh
Microcephaly-capillary malformation syndrome is a congenital and neurodevelopmental disorder caused by biallelic mutations in the STAMBP gene. Here we identify the novel homozygous mutation located in the SH3 binding motif of STAMBP (NM_006463.4) (c.707C>T: p.Ser236Phe) through whole-exome sequencing. The case patient was a 2-year-old boy showing severe global developmental delay, progressive microcephaly, refractory seizures, dysmorphic facial features, and multiple capillary malformations. Immunoblot analysis of patient-derived lymphoblastoid cell lines (LCLs) revealed a severe reduction in STAMBP expression, indicating that Ser236Phe induces protein instability...
June 15, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29907874/nearing-saturation-of-cancer-driver-gene-discovery
#10
EDITORIAL
David Hsiehchen, Antony Hsieh
Extensive sequencing efforts of cancer genomes such as The Cancer Genome Atlas (TCGA) have been undertaken to uncover bona fide cancer driver genes which has enhanced our understanding of cancer and revealed therapeutic targets. However, the number of driver gene mutations is bounded, indicating that there must be a point when further sequencing efforts will be excessive. We found that there was a significant positive correlation between sample size and identified driver gene mutations across 33 cancers sequenced by the TCGA, which is expected if additional sequencing is still leading to the identification of more driver genes...
June 15, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29907873/genetic-background-of-japanese-patients-with-pediatric-hypertrophic-and-restrictive-cardiomyopathy
#11
Takeharu Hayashi, Kousuke Tanimoto, Kayoko Hirayama-Yamada, Etsuko Tsuda, Mamoru Ayusawa, Shinichi Nunoda, Akira Hosaki, Akinori Kimura
Hypertrophic cardiomyopathy (HCM) and restrictive cardiomyopathy (RCM) present a high risk for sudden cardiac death in pediatric patients. The aim of this study was to identify disease-associated genetic variants in Japanese patients with pediatric HCM and RCM. We analyzed 67 cardiomyopathy-associated genes in 46 HCM and 7 RCM patients diagnosed before 16 years of age using a next-generation sequencing system. We found that 78% of HCM and 71% of RCM patients carried disease-associated genetic variants. Disease-associated genetic variants were identified in 80% of HCM patients with a family history and in 77% of HCM patients with no apparent family history (NFH)...
June 15, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29904113/a-commentary-on-a-case-of-new-pcdh12-gene-variants-presented-as-dyskinetic-cerebral-palsy-with-epilepsy
#12
EDITORIAL
Eraldo Fonseca Dos Santos-Junior, João Ricardo Mendes de Oliveira
No abstract text is available yet for this article.
June 14, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29899504/a-kat6a-variant-in-a-family-with-autosomal-dominantly-inherited-microcephaly-and-developmental-delay
#13
Joanne Trinh, Irina Hüning, Zafer Yüksel, Nadja Baalmann, Sophie Imhoff, Christine Klein, Arndt Rolfs, Gabriele Gillessen-Kaesbach, Katja Lohmann
Approximately 1-3% of children have intellectual disability or global developmental delay. Heterozygous mutations have emerged as a major cause of different intellectual disability syndromes. In severely affected patients, reproductive fitness is impaired and mutations have usually arisen de novo. Massive parallel sequencing has been an effective means of diagnosing patients, especially those who carry a de novo mutation. The molecular diagnosis can be a way to shift from a more phenotype-driven management of the clinical signs to a more refined treatment based on genotype...
June 13, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29891931/a-repeat-primed-pcr-assay-for-pentanucleotide-repeat-alleles-in-spinocerebellar-ataxia-type-37
#14
Joana Rocha Loureiro, Cláudia Louro Oliveira, Jorge Sequeiros, Isabel Silveira
Spinocerebellar ataxia 37 (SCA37) is caused by an (ATTTC)n insertion in a polymorphic ATTTT repeat in the non-coding region of DAB1. The non-pathogenic alleles have a configuration [(ATTTT)7-400 ], whereas pathogenic alleles have a complex structure of [(ATTTT)60-79 (ATTTC)31-75 (ATTTT)58-90 ]. Molecular diagnosis of SCA37 is laborious because about 7% of the pentanucleotide repeat alleles in DAB1 are larger than 30 units and, thus, fail to amplify with standard PCR conditions, resulting in apparently homoallelism or in complete lack of PCR amplification in several cases...
June 11, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29884797/a-novel-frameshift-deletion-in-pls3-causing-severe-primary-osteoporosis
#15
Alice Costantini, Panagiotis Ν Krallis, Anders Kämpe, Emmanouil M Karavitakis, Fulya Taylan, Outi Mäkitie, Artemis Doulgeraki
Mutations in the gene encoding plastin-3, PLS3, have recently been associated to severe primary osteoporosis. The molecular function of plastin-3 is not fully understood. Since PLS3 is located on the X chromosome, males are usually more severely affected than females. PLS3 mutations have thus far been reported in approximately 20 young patients with low bone mineral density (BMD). We describe an 8-year-old Greek boy with severe primary osteoporosis with multiple vertebral compression fractures and one low-energy long bone fracture...
June 8, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29884796/dissecting-the-wolf-hirschhorn-syndrome-phenotype-whsc1-is-a-neurodevelopmental-gene-contributing-to-growth-delay-intellectual-disability-and-to-the-facial-dysmorphism
#16
EDITORIAL
Marcella Zollino, Paolo Niccolo' Doronzio
No abstract text is available yet for this article.
June 8, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29884795/further-expansion-of-the-mutational-spectrum-of-spondylo-meta-epiphyseal-dysplasia-with-abnormal-calcification
#17
Gizem Ürel-Demir, Pelin Ozlem Simsek-Kiper, Özlem Akgün-Doğan, Rahşan Göçmen, Zheng Wang, Naomichi Matsumoto, Noriko Miyake, Gülen Eda Utine, Gen Nishimura, Shiro Ikegawa, Koray Boduroglu
Spondylo-meta-epiphyseal dysplasia, short limb-abnormal calcification type, is a rare autosomal recessive disorder of the skeleton characterized by disproportionate short stature with narrow chest and dysmorphic facial features. The skeletal manifestations include platyspondyly, short flared ribs, short tubular bones with abnormal metaphyses and epiphyses, severe brachydactyly, and premature stippled calcifications in the cartilage. The abnormal calcifications are so distinctive as to point to the definitive diagnosis...
June 8, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29872111/association-between-the-fgfr1-rs13317-single-nucleotide-polymorphism-and-orbitale-nasion-depth-based-on-cephalometric-images
#18
Mohamed Adel, Tetsutaro Yamaguchi, Daisuke Tomita, Yong-Il Kim, Masahiro Takahashi, Takatoshi Nakawaki, Yu Hikita, Shugo Haga, Mohamed Nadim, Akira Kawaguchi, Mutsumi Isa, Walid El-Kenany, Abbadi A El-Kadi, Soo-Byung Park, Hajime Ishida, Koutaro Maki, Ryosuke Kimura
The fibroblast growth factor receptor 1 (FGFR1) gene plays an important role in craniofacial morphogenesis. In our previous study, an association between FGFR1 single nucleotide polymorphisms (SNPs) and craniofacial morphology was demonstrated in Japanese and Korean subjects. The present study aimed to evaluate the relationship between a common FGFR1 SNP (rs13317) with craniofacial morphology, increasing the number of measurements and examining Egyptian subjects (n = 191) in addition to the Japanese (n = 211) and Korean (n = 226) subjects...
June 5, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29849041/maternal-age-specific-risk-for-trisomy-21-based-on-the-clinical-performance-of-nipt-and-empirically-derived-nipt-age-specific-positive-and-negative-predictive-values-in-japan
#19
Takahiro Yamada, Akihiko Sekizawa, Yosuke Fujii, Tatsuko Hirose, Osamu Samura, Nobuhiro Suzumori, Kiyonori Miura, Hideaki Sawai, Fumiki Hirahara, Haruhiko Sago
The data collected by nation-wide study of noninvasive prenatal genetic testing (NIPT) for trisomy 21 from 21,610 pregnant women with advanced maternal age in Japan were reported. Among 188 NIPT-positive cases, 180 cases were true positive. The incidence of aneuploidy according to maternal age was estimated using a state-space model. Although, the frequency of trisomy increased exponentially with maternal age as previously reported, the maternal age-specific risk for trisomy 21 that was based on the clinical performance of NIPT was lower than the predicted risk in previous Western cohorts based on the data from invasive prenatal testing (Bayesian two-sided tail-area probability P = 0...
May 30, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29849040/congenital-chloride-diarrhea-needs-to-be-distinguished-from-bartter-and-gitelman-syndrome
#20
Natsuki Matsunoshita, Kandai Nozu, Masahide Yoshikane, Azusa Kawaguchi, Naoya Fujita, Naoya Morisada, Shingo Ishimori, Tomohiko Yamamura, Shogo Minamikawa, Tomoko Horinouchi, Keita Nakanishi, Junya Fujimura, Takeshi Ninchoji, Ichiro Morioka, Hiroaki Nagase, Mariko Taniguchi-Ikeda, Hiroshi Kaito, Kazumoto Iijima
Pseudo-Bartter/Gitelman syndrome (p-BS/GS) encompasses a clinically heterogeneous group of inherited or acquired disorders similar to Bartter syndrome (BS) or Gitelman syndrome (GS), both renal salt-losing tubulopathies. Phenotypic overlap frequently occurs between p-BS/GS and BS/GS, which are difficult to diagnose based on their clinical presentation and require genetic tests for accurate diagnosis. In addition, p-BS/GS can occur as a result of other inherited diseases such as cystic fibrosis, autosomal dominant hypocalcemia, Dent disease, or congenital chloride diarrhea (CCD)...
May 30, 2018: Journal of Human Genetics
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