Evidence for linkage disequilibrium between D16S94 and the adult onset polycystic kidney disease (PKD1) gene.

Поликистозная болезнь почек (ПП) является клинически и генетически гетерогенной группой заболеваний, может наследоваться как аутосомно-доминантно (АД), так и аутосомно-рецессивно (АР). К развитию АР ПП приводят мутации в гене PKHD1. Большинство мутаций при АД ПП находят в гене PKD1 (80-85%). Примерно в 15% случаев мутации выявляют в гене PKD2. Клиническое и генетическое разнообразие ПП требует поиска мутаций в нескольких генах, поэтому он является трудоемким, дорогостоящим и требует много времени. Метод массового параллельного секвенирования (МПС) позволяет проводить поиск мутаций в нескольких генах одновременно независимо от их размера. Проведен поиск мутаций в 254 семьях с ПП методом МПС с использованием панели, включающей гены PKHD1, PKD1, PKD2, HNF1B и GANAB. Два варианта в гене PKHD1 было идентифицировано в 49 семьях (19%), один вариант найден в 9 случаях (3,5%); в гене PKD1 обнаружено 62 варианта (24,5%), в гене PKD2 - 6 вариантов (2,5%), в гене HNF1B - 9 вариантов (3,5%). В 119 семьях, что составило 47%, мутации найдены не были. У больных из семей с генеалогически установленным АД типом наследования в большинстве случаев (39 из 66; 59%) выявлены варианты в гене PKD1, приводящие к ПП. Из 59 изолированных случаев ПП в 17% (10 человек) идентифицированы 2 варианта в гене PНKD1, в 20% (12 человек) - в гене PKD1. При неизвестном типе наследования (129 случаев) в 29,5% (38 чел.) найдены 2 варианта в гене PНKD1, в 8,5% (11 чел.) - в гене PKD1, в 3% (4 чел.) - в гене PKD2, в 4% (5 чел.) - в гене HNF1B. Таким образом, МПС относительно быстро позволяет проводить молекулярно-генетический анализ одновременно в нескольких генах у больных с признаками ПП. Polycystic kidney disease is a heterogeneous group of autosomal dominant or autosomal recessive disorders with age of manifestation varying from prenatal period to adulthood. Autosomal recessive polycystic kidney disease is caused by mutations in the PKHD1 gene. Approximately 85% of all autosomal dominant polycystic kidney disease cases are caused by mutations in the PKD1 gene, and around 15% - by mutations in the PKD2 gene. All these genes are large, and mutations were found to be scattered throughout the genes without any clustering. Therefore, mutation detection requires a lot of time, money, and effort. Due to clinical and genetic diversity of polycystic kidney disease, the search for mutations has to be carried out in several genes. Mass parallel sequencing (MPS) allows to analyze several genes simultaneously regardless of their size. 254 families with polycystic kidney disease were examined using mass parallel sequencing with a gene panel that included PKHD1, PKD1, PKD2, HNF1B and GANAB. Two variants in PKHD1 were found in 49 families (19%), one variant - in 9 families (3.5%); in PKD1 62 variants were detected (24.5%), in PKD2 - 6 variants (2.5%), in HNF1B - 9 variants (3.5%). In 119 families (47%) there were no mutations in the target genes. Among 66 patients from families with autosomal dominant polycystic kidney disease, 39 patients (59%) had mutations in the PKD1 gene. Out of 59 sporadic cases, 10 patients (17%) had 2 variants in PНKD1, 12 patients (20%) - in PKD1. 38 patients (29.5%) out of 129 patients with unknown type of inheritance had 2 variants in PНKD1, 11 patients (8.5%) - in PKD1, 4 patients (3%) - in PKD2, 5 patients (4%) - in HNF1B. Mass parallel sequencing allows to carry out relatively rapid molecular genetic analysis of several genes simultaneously for patients with symptoms of polycystic kidney disease.

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Cell-Autonomous Hedgehog Signaling Is Not Required for Cyst Formation in Autosomal Dominant Polycystic Kidney Disease

Journal of the American Society of Nephrology ◽

10.1681/asn.2018121274 ◽

2019 ◽

Vol 30 (11) ◽

pp. 2103-2111 ◽

Cited By ~ 6

Author(s):

Ming Ma ◽

Emilie Legué ◽

Xin Tian ◽

Stefan Somlo ◽

Karel F. Liem

Keyword(s):

Kidney Disease ◽

Polycystic Kidney Disease ◽

Mouse Models ◽

Hedgehog Signaling ◽

Autosomal Dominant ◽

Cyst Formation ◽

Hedgehog Pathway ◽

Adult Onset ◽

Polycystic Kidney ◽

Autosomal Dominant Polycystic Kidney

BackgroundPKD1 or PKD2, the two main causal genes for autosomal dominant polycystic kidney disease (ADPKD), encode the multipass transmembrane proteins polycystin-1 (PC1) and polycystin-2 (PC2), respectively. Polycystins localize to the primary cilium, an organelle essential for cell signaling, including signal transduction of the Hedgehog pathway. Mutations in ciliary genes that build and maintain the cilium also cause renal cystic disease through unknown pathways. Although recent studies have found alterations in Hedgehog signaling in ADPKD-related models and tissues, the relationship between Hedgehog and polycystic kidney disease is not known.MethodsTo examine the potential role of cell-autonomous Hedgehog signaling in regulating kidney cyst formation in vivo in both early- and adult-onset mouse models of ADPKD, we used conditional inactivation of Pkd1 combined with conditional modulation of Hedgehog signaling components in renal epithelial cells, where mutations in Pkd1 initiate cyst formation. After increasing or decreasing levels of Hedgehog signaling in cells that underwent inactivation of Pkd1, we evaluated the effects of these genetic manipulations on quantitative parameters of polycystic kidney disease severity.ResultsWe found that in Pkd1 conditional mutant mouse kidneys, neither downregulation nor activation of the Hedgehog pathway in epithelial cells along the nephron significantly influenced the severity of the polycystic kidney phenotype in mouse models of developmental or adult-onset of ADPKD.ConclusionsThese data suggest that loss of Pkd1 function results in kidney cysts through pathways that are not affected by the activity of the Hedgehog pathway.

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Prevalence of PKD1 gene mutation in cats in Turkey and pathogenesis of feline polycystic kidney disease

Journal of Veterinary Diagnostic Investigation ◽

10.1177/1040638720935433 ◽

2020 ◽

Vol 32 (4) ◽

pp. 549-555

Author(s):

Nüket Bilgen ◽

Merve Bişkin Türkmen ◽

Bengi Çınar Kul ◽

Sevim Isparta ◽

Yusuf Şen ◽

...

Keyword(s):

Renal Failure ◽

Kidney Disease ◽

Polycystic Kidney Disease ◽

Nuclear Family ◽

Hereditary Diseases ◽

Polycystic Kidney ◽

Renal Abnormality ◽

Pkd1 Gene ◽

High Prevalence ◽

Pcr Rflp

Polycystic kidney disease (PKD) is one of the most common hereditary diseases in cats, with high prevalence in Persian and Persian-related cats. PKD is caused mainly by an inherited autosomal dominant (AD) mutation, and animals may be asymptomatic for years. We screened 16 cats from various breeds exhibiting a renal abnormality by ultrasound examination and genotyped them for the c.10063C>A transversion on exon 29 of the polycystin-1 ( PKD1) gene, by PCR–restriction fragment length polymorphism (PCR-RFLP). Among these cats, a Siamese nuclear family of 4 cats with ancestral hereditary renal failure were screened by whole-genome sequencing (WGS) to determine novel variations in genes associated with both AD and autosomal recessive PKD in humans. During the study period, one cat died as a result of renal failure and was forwarded for autopsy. Additionally, we screened 294 cats asymptomatic for renal disease (Angora, Van, Persian, Siamese, Scottish Fold, Exotic Shorthair, British Shorthair, and mixed breeds) to determine the prevalence of the mutation in cats in Turkey. Ten of the symptomatic and 2 of the asymptomatic cats carried the heterozygous C → A transversion, indicating a prevalence of 62.5% and 0.68%, respectively. In the WGS analysis of 4 cats in the Siamese nuclear family, novel variations were determined in the fibrocystin gene ( PKHD1), which was not compatible with dominant inheritance of PKD.

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