SciCombinator

Discover the most talked about and latest scientific content & concepts.

Journal: Journal of medical genetics

34

Thymine kinase 2 (TK2) is a mitochondrial matrix protein encoded in nuclear DNA and phosphorylates the pyrimidine nucleosides: thymidine and deoxycytidine. Autosomal recessiveTK2mutations cause a spectrum of disease from infantile onset to adult onset manifesting primarily as myopathy.

Concepts: DNA, Adenosine triphosphate, RNA, Nucleoside, Pyrimidine, Nucleobase, Guanine, Thymine

29

Fabry disease is an X-linked lysosomal storage disorder caused by GLA mutations, resulting in α-galactosidase (α-Gal) deficiency and accumulation of lysosomal substrates. Migalastat, an oral pharmacological chaperone being developed as an alternative to intravenous enzyme replacement therapy (ERT), stabilises specific mutant (amenable) forms of α-Gal to facilitate normal lysosomal trafficking.

Concepts: Medicine, Enzyme, Lysosomal storage disease, Therapy, Enzyme replacement therapy, Fabry disease

28

The 11p15 region is organised into two independent imprinted domains controlled by imprinting control regions, which carry opposite germline imprints. Dysregulation of 11p15 genomic imprinting results in two human fetal growth disorders (Silver-Russell syndrome (SRS, MIM 180860) and Beckwith-Wiedemann syndrome (BWS, MIM 130650)) with opposite growth phenotypes. The mouse orthologous region on distal chromosome 7 (dist7) is well conserved in its organisation and its regulation. Targeted mutagenesis in mice has provided highly valuable clues in terms of the mechanisms involved in the regulation of genomic imprinting of the 11p15/dist7 imprinted region. On the other hand, the recent identification of unexpected genetic defects in BWS and SRS patients also brought new insights into the mechanisms of 11p15 imprinting regulation. However, some mouse models and human genetic defects show contradictions in term of growth phenotypes and parental transmission. In this review, we extensively analyse those various mouse and human models and more particularly models with mutations affecting the two imprinting centres, in order to improve our understanding of regulation of 11p15/dist7 genomic imprinting.

Concepts: Gene, Genetics, Disease, Genetic disorder, Mutation, Mouse, Mice, H19

28

Autosomal recessive hereditary spastic paraplegias (AR-HSP) constitute a heterogeneous group of neurodegenerative diseases involving pyramidal tracts dysfunction. The genes responsible for many types of AR-HSPs remain unknown. We attempted to identify the gene responsible for AR-HSP with optic atrophy and neuropathy.

Concepts: DNA, Genetics, Allele, Evolution, Biology, Chromosome, Zygosity, Hereditary spastic paraplegia

26

Opitz G/BBB syndrome is a heterogeneous disorder characterised by variable expression of midline defects including cleft lip and palate, hypertelorism, laryngealtracheoesophageal anomalies, congenital heart defects, and hypospadias. The X-linked form of the condition has been associated with mutations in the MID1 gene on Xp22. The autosomal dominant form has been linked to chromosome 22q11.2, although the causative gene has yet to be elucidated.

Concepts: DNA, Genetics, Cell nucleus, Bacteria, Evolution, Chromosome, Congenital heart defect, Congenital heart disease

26

Retinitis pigmentosa (RP) is the most frequent inherited retinal disease, which shows a relatively high incidence of the autosomal-recessive form in Pakistan.

Concepts: Mutation, Retina, Retinitis pigmentosa, Point mutation, Missense mutation, Nonsense mutation

18

Osteonecrosis of the femoral head is a debilitating disease that involves impaired blood supply to the femoral head and leads to femoral head collapse.

Concepts: Immune system, Cancer, Genetic disorder, Mutation, Blood, Avascular necrosis, Femur head

18

Several recessive Mendelian disorders are common in Europeans, including cystic fibrosis (CFTR), medium-chain-acyl-Co-A-dehydrogenase deficiency (ACADM), phenylketonuria (PAH) and alpha 1-antitrypsin deficiency (SERPINA1).

Concepts: Cystic fibrosis, Alpha 1-antitrypsin deficiency, Phenylketonuria, Alpha 1-antitrypsin

17

Inherited CDKN2A mutation is a strong risk factor for cutaneous melanoma. Moreover, carriers have been found to have poor melanoma-specific survival. In this study, responses to novel immunotherapy agents in CDKN2A mutation carriers with metastatic melanoma were evaluated.

16

Wolf-Hirschhorn syndrome (WHS) is a contiguous gene deletion syndrome involving variable size deletions of the 4p16.3 region. Seizures are frequently, but not always, associated with WHS. We hypothesised that the size and location of the deleted region may correlate with seizure presentation.

Concepts: DNA, Chromosome, Deletion