Galactokinase deficiency

Galactokinase deficiency is an inborn error of galactose metabolism. Untreated patients develop early onset, bilateral cataracts, which at this time appears to be the only consistent abnormality in galactokinase deficiency. Rarely, additional clinical symptoms have been reported including asymptomatic hypoglycemia, mental retardation, failure to thrive, seizures, deafness, hepatomegaly, and hypercholesterolemia; however, it is unclear whether these additional abnormalities are a result of galactokinase enzyme deficiency. In one report of 18 affected patients, the authors report that additional symptoms seemed to be more prevalent in patients who were non-compliant with treatment. Treatment of patients with a lactose-free, reduced galactose diet results in prevention or, in some cases, regression of cataracts. Estimates of the frequency of galactokinase deficiency range from 1 in 2,200,00 to 1 in 40,000.1 The highest incidence has been found in the Romani population where the carrier frequency is estimated to be 1 in 47.

Tests Available

Forms and Documents

Test Details

  • Confirmation of biochemical diagnosis
  • Carrier testing

Ordering

499
4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.

Billing

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

**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Forms and Documents

Test Details

ABCA3, ABHD5, ADAMTSL4, AGK, AKR1E2, ALDH18A1, BCOR, BEST1, BFSP1, BFSP2, CHMP4B, COL11A1, COL2A1, COL4A1, COL4A2, CRYAA, CRYAB, CRYBA1, CRYBA2, CRYBA4, CRYBB1, CRYBB2, CRYBB3, CRYGB, CRYGC, CRYGD, CRYGS, CTDP1, CYP27A1, CYP51A1, EBP, EPG5, EPHA2, ERCC2, ERCC5, ERCC6, ERCC8, EYA1, FAM126A, FOXC1, FOXE3, FTL, FYCO1, FZD4, GALK1, GALT, GCNT2, GFER, GJA1, GJA3, GJA8, HMX1, HSF4, JAM3, LIM2, LONP1, LSS, MAF, MAN2B1, MIP, MIR184, MYH9, NDP, NF2, NHS, OCRL, OPA3, PAX6, PEX11B, PEX7, PITX2, PITX3, PXDN, RAB18, RAB3GAP1, RAB3GAP2, RECQL4, RGS6, RNLS, RRAGA, SC5D, SIL1, SIPA1L3, SIX6, SLC16A12, SLC33A1, TBC1D20, TDRD7, TFAP2A, TMEM70, UNC45B, VIM, VSX2, WDR87, WFS1, WRN
  • Cataracts that are not age-related
  • Cataracts co-occurring with other symptoms
  • Microopthalmia and glaucoma commonly co-occur. Additional eye findings may suggest a syndrome
  • Sporadic or familial inheritance patterns

Ordering

J958
4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.

Billing

81403x1; 81404x1; 81405x2; 81406x1; 81479x1
Yes
Yes
For price inquiries please email zebras@genedx.com

**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

References

  1. Deng et al. (2014) Eur J Med Genet 57 (2-3):113-22 (PMID: 24384146)
  2. Patel et al. (2017) Hum. Genet. 136 (2):205-225 (PMID: 27878435)
  3. Ma et al. (2016) Hum. Mutat. 37 (4):371-84 (PMID: 26694549)
  4. Shiels et al. (2015) Prog Mol Biol Transl Sci 134 :203-18 (PMID: 26310156)
  5. Aldahmesh et al. (2012) Genetics In Medicine : Official Journal Of The American College Of Medical Genetics 14 (12):955-62 (PMID: 22935719)