Alport Syndrome

Alport syndrome (AS) is a progressive glomerulonephritis associated with sensorineural hearing loss with a prevalence of about 1 in 50,000 live births. X-linked Alport syndrome usually manifests in affected males with microscopic hematuria and progressive sensorineural hearing loss during childhood or adolescence. Later, patients develop proteinuria and progressive renal failure, which eventually leads to end-stage renal disease in their 30s and 40s. Ocular symptoms are also common and may include maculopathy, posterior polymorphous dystrophy, and recurrent corneal erosion. Anterior lenticonus is considered to be virtually pathognomonic for Alport syndrome. X-linked Alport syndrome is semi-dominant and often manifests in female carriers. Approximately 90% of female carriers have microscopic hematuria, which can lead to renal failure later in life. Hearing loss is less frequent in female carriers, with a later age of onset. Alport syndrome with diffuse leiomyomatosis is a contiguous gene deletion syndrome. The submicroscopic genomic deletions involve the COL4A5 gene and parts of the adjacent COL4A6 gene. This disorder is characterized by features of Alport syndrome and by leiomyomatosis of the esophagus and tracheobronchial tree. It manifests in late childhood and can include dysphagia, postprandial vomiting, epigastric pain, recurrent bronchitis, dyspnea, cough, and stridor. Affected females may also have genital leiomyomas. Alport syndrome associated with mental retardation, midface hypoplasia and elliptocytosis is another contiguous gene deletion syndrome involving COL4A5 and FACL4, which encodes a long-chain acyl-CoA synthetase

Tests Available

Forms and Documents

Test Details

ABHD12, ACTB, ACTG1, ADCY1, ADGRV1 (GPR98), AIFM1, ALMS1, ANKH, ATP6V1B1, BDP1, BSND, CABP2, CACNA1D, CCDC50, CD164, CDC14A, CDH23, CEACAM16, CHD7, CIB2, CLDN14, CLIC5, CLPP, CLRN1, COCH, COL11A1, COL11A2, COL2A1, COL4A3, COL4A4, COL4A5, COL4A6, CRYM, DCDC2, DFNA5, DFNB59, DIABLO, DIAPH1, DIAPH3, DNMT1, DSPP, EDN3, EDNRB, ELMOD3, EPS8, ESPN, ESRRB, EYA1, EYA4, FGF3, FGFR1, FGFR2, FGFR3, FOXI1, GATA3, GIPC3, GJA1, GJB2(CX26), GJB3(CX31), GJB6(CX30), GPSM2, GRHL2, GRXCR1, HARS, HARS2, HGF, HOMER2, HSD17B4, ILDR1, KARS, KCNE1, KCNJ10, KCNQ1, KCNQ4, KITLG, LARS2, LHFPL5, LRTOMT, MARVELD2, MCM2, MIR96, MITF, MSRB3, MT-CO1, MT-RNR1, MT-TL1, MT-TS1, MYH14, MYH9, MYO15A, MYO3A, MYO6, MYO7A, NDP, NLRP3, OPA1, OSBPL2, OTOA, OTOF, OTOG, OTOGL, P2RX2, PAX3, PCDH15, PDZD7, PMP22, PNPT1, POLR1D, POU3F4, POU4F3, PRPS1, PTPRQ, RDX, RIPOR2, S1PR2, SALL1, SEMA3E, SERPINB6, SIX1, SIX5, SLC17A8, SLC26A4, SLC26A5, SLC33A1, SLITRK6, SMPX, SNAI2, SOX10, SOX2, STRC, SYNE4, TBC1D24, TBX1, TCOF1, TECTA, TFAP2A, TIMM8A, TJP2, TMC1, TMIE, TMPRSS3, TNC, TPRN, TRIOBP, TSPEAR, USH1C, USH1G, USH2A, WFS1, WHRN(DFNB31)
  • Molecular confirmation of a clinical diagnosis
  • To assist with decisions about treatment and management
  • Testing of at-risk relatives for specific known variant(s) previously identified in an affected family member
  • Prenatal diagnosis for known familial pathogenic variant(s) in at-risk pregnancies
  • Genetic counseling, especially recurrence risk and prenatal diagnosis.

Ordering

J806
4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

Billing

81430x1, 81431x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

References

  1. Morton et al. (2006) N. Engl. J. Med. 354 (20):2151-64 (PMID: 16707752)
  2. Wroblewska-Seniuk et al. (2017) Pediatr. Res. : (PMID: 27861465)
  3. Hilgert et al. (2009) Mutat. Res. 681 (2-3):189-96 (PMID: 18804553)
  4. Sloan-Heggen et al. (2016) Hum. Genet. 135 (4):441-50 (PMID: 26969326)
  5. Shearer et al. (2010) Proceedings Of The National Academy Of Sciences Of The United States Of America 107 (49):21104-9 (PMID: 21078986)
  6. Sommen et al. (2016) Hum. Mutat. 37 (8):812-9 (PMID: 27068579)
  7. Venkatesh et al. (2015) Med J Armed Forces India 71 (4):363-8 (PMID: 26663965)
  8. Kochhar et al. (2007) Genet. Med. 9 (7):393-408 (PMID: 17666886)
  9. Martínez et al. (2009) Antioxid. Redox Signal. 11 (2):309-22 (PMID: 18837651)

Forms and Documents

Test Details

CD151, COL4A3, COL4A4, COL4A5, COL4A6, MYH9
  • Molecular confirmation of a clinical diagnosis
  • Development of appropriate evaluation and management plan
  • Differentiation between X-linked and autosomal recessive or dominant forms of the disease
  • Evaluation of family members as possible donors for kidney transplantation
  • Testing of at-risk relatives for specific known variant(s) previously identified in an affected family member
  • Prenatal diagnosis for known familial pathogenic variant(s) in at-risk pregnancies
  • Genetic counseling, especially recurrence risk and prenatal diagnosis

Ordering

TG21
4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs | Extracted DNA

Billing

81407x1; 81408x2
No
Yes
* For price inquiries please email zebras@genedx.com