Fundus Albipunctatus

Fundus albipunctatus is a retinal disorder characterized by night blindness and delayed dark adaptation after exposure to bright light, which typically presents during early childhood The fundi of affected individuals contain multiple small, white or pale yellow dots in the retinal pigment epithelium, which may or may not involve the macula. These dots can remain unchanged, become more prominent, or can fade during aging; new dots may also appear. The dark-adaptation curve of affected individuals features prolonged recovery of cone and rod sensitivity and electroretinogram cone and rod amplitudes are markedly reduced after 30-40 minutes of dark adaptation; however, they may come to normal or near-normal levels after many hours of adaptation showed that approximately 38% of individuals with FA have extensive cone dysfunction. Mutations in the RLBP1 gene have also been reported in FA patient.

Tests Available

Forms and Documents

Test Details

RDH5
  • Confirmation of a clinical diagnosis.
  • Differential diagnosis: Dietary vitamin A deficiency, vitamin A deficiency resulting from a lack of lipoprotein (Bassen-Kornzweig syndrome), a lack of serum retinoid-binding protein, gyrate atrophy or choroideremia.
  • Carrier testing for family members of an affected individual with known mutation(s).
  • Prenatal diagnosis in at-risk pregnancies
  • Capillary Sequencing

Ordering

427
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL)|Buccal Swabs

Billing

81479x1
No
Yes
* For price inquiries please email zebras@genedx.com

References

  1. Yamamoto H et al., (1999) Nat Genet 22:188-91
  2. Nakamura et al. (2003) Doc Ophthalmol 107(1):3-11
  3. Liden et al., (2001) J Biol Chem 276(52):49251-7
  4. Driessen et al., (2001) Ophthalmology 108(8):1479-
  5. Nakamura et al., (2000) Invest Ophthalmol Vis Sci 41(12):3925-32
  6. Dryja TP (2000) Am J Ophthalmol 130(5):547-63
  7. Niwa et al., (2005) Invest Ophthalmol Vis Sci 46(4):1480-5

Forms and Documents

Test Details

RLBP1
  • Confirmation of a clinical diagnosis.
  • Development of an appropriate management plan.
  • Prenatal diagnosis in families, in which the pathogenic mutation(s) have been identified.
  • Capillary Sequencing

Ordering

4241
3 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL)|Dried Blood Spots|Buccal Swabs

Billing

81479x1
No
Yes
* For price inquiries please email zebras@genedx.com

References

  1. Souied E et al., (1996) Am J Ophthalmol 121:19-25
  2. Kajiwara K et al., (1993) Nat Genet 3:208-212
  3. Maw et al., (1997) Nat Genet 17:198-200
  4. Humbert et al., (2006) Invest Ophthalmol Vis Sci 47:4719-4724
  5. Morimura et al., (1999) Invest Ophthalmol Vis Sci 40:1000-1004
  6. Katsanis et al., (2001) Clin Genet 59:424-429
  7. Demirci et al., (2004) Am J Ophthalmol 138:171-173
  8. Fishman et al., (2004) Arch Ophthalmol 122:70-75
  9. Burstedt et al., (2001) Arch Ophthalmol 119:260-267
  10. Eichers et al., (2002) Am J Hum Genet 70:955-964
  11. Burstedt et al., (1999) Invest Ophthalmol Vis Sci 40:995-999
  12. Dryja TP; (2000) Am J Ophthalmol 130:547-63

Forms and Documents

Test Details

  • Molecular confirmation of a clinical diagnosis
  • To assist with decisions about treatment and management of individuals with retinal dystrophies
  • 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
  • Next-Gen Sequencing

Ordering

J905
6 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL)|Buccal Swabs

Billing

81434x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

References

  1. Sahel et al. (2014) Cold Spring Harb Perspect Med 5 (2):a017111 (PMID: 25324231)
  2. Kocur et al. (2002) Br J Ophthalmol 86 (7):716-22 (PMID: 12084735);
  3. Ayuso et al. (2010) Genome Med 2 (5):34 (PMID: 20519033)
  4. Finger et al. (2011) Invest. Ophthalmol. Vis. Sci. 52 (7):4381-9 (PMID: 21447690)
  5. den Hollander et al. (2006) American Journal Of Human Genetics 79 (3):556-61 (PMID: 16909394)
  6. Braun et al. (2013) Human Molecular Genetics 22 (25):5136-45 (PMID: 23918662)
  7. Zernant et al. (2014) Hum. Mol. Genet. 23 (25):6797-806 (PMID: 25082829)
  8. Bauwens et al. (2015) Hum. Mutat. 36 (1):39-42 (PMID: 25346251)
  9. Schulz et al. (2017) Invest. Ophthalmol. Vis. Sci. 58 (1):394-403 (PMID: 28118664)
  10. Beryozkin et al. (2015) Sci Rep 5 :13187 (PMID: 26306921)
  11. Lee et al. (2015) Am. J. Ophthalmol. 160 (2):354-363.e9 (PMID: 25910913)
  12. de Castro-Miro et al. (2016) PLoS ONE 11 (12):e0168966 (PMID: 28005958)
  13. Haer-Wigman et al. (2017) Eur. J. Hum. Genet. 25 (5):591-599 (PMID: 28224992)
  14. Riera et al. (2017) Sci Rep 7 :42078 (PMID: 28181551)
  15. Carss et al. (2017) Am. J. Hum. Genet. 100 (1):75-90 (PMID: 28041643)
  16. Retterer et al. (2015) Genet. Med.: (PMID: 26633542)