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Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome.

ABSTRACT: Hand-foot-genital syndrome (HFGS) is a rare, dominantly inherited condition affecting the distal limbs and genitourinary tract. A nonsense mutation in the homeobox of HOXA13 has been identified in one affected family, making HFGS the second human syndrome shown to be caused by a HOX gene mutation. We have therefore examined HOXA13 in two new and four previously reported families with features of HFGS. In families 1, 2, and 3, nonsense mutations truncating the encoded protein N-terminal to or within the homeodomain produce typical limb and genitourinary abnormalities; in family 4, an expansion of an N-terminal polyalanine tract produces a similar phenotype; in family 5, a missense mutation, which alters an invariant domain, produces an exceptionally severe limb phenotype; and in family 6, in which limb abnormalities were atypical, no HOXA13 mutation could be detected. Mutations in HOXA13 can therefore cause more-severe limb abnormalities than previously suspected and may act by more than one mechanism.

SUBMITTER: Goodman FR

PROVIDER: S-EPMC1287077 | biostudies-literature | 2000 Jul

REPOSITORIES: biostudies-literature

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Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome.

Goodman F R FR Bacchelli C C Brady A F AF Brueton L A LA Fryns J P JP Mortlock D P DP Innis J W JW Holmes L B LB Donnenfeld A E AE Feingold M M Beemer F A FA Hennekam R C RC Scambler P J PJ

American journal of human genetics 20000605 1

Hand-foot-genital syndrome (HFGS) is a rare, dominantly inherited condition affecting the distal limbs and genitourinary tract. A nonsense mutation in the homeobox of HOXA13 has been identified in one affected family, making HFGS the second human syndrome shown to be caused by a HOX gene mutation. We have therefore examined HOXA13 in two new and four previously reported families with features of HFGS. In families 1, 2, and 3, nonsense mutations truncating the encoded protein N-terminal to or wit ...[more]

PMID: 10839976

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Project description:Importance:Hand-foot syndrome (HFS) is a common adverse effect of capecitabine treatment. Objective:To compare the incidence and time to onset of grade 2 or greater HFS in patients receiving pyridoxine vs placebo and to identify biomarkers predictive of HFS. Design, Setting, and Participants:This single-center, randomized double-blind, placebo-controlled phase 3 trial conducted at National Cancer Centre Singapore assessed whether oral pyridoxine could prevent the onset of grade 2 or higher HFS in 210 patients scheduled to receive single-agent capecitabine chemotherapy for breast, colorectal, and other cancers. Interventions:Patients were randomized to receive concurrent pyridoxine (200 mg) or placebo daily for a maximum of 8 cycles of capecitabine, with stratification by sex and use in adjuvant or neoadjuvant vs palliative setting. Patients were withdrawn from the study on development of grade 2 or higher HFS or cessation of capecitabine. Main Outcomes and Measures:Primary end point was the incidence of grade 2 or higher HFS in patients receiving pyridoxine. Secondary end points included the time to onset (days) of grade 2 or higher HFS and identification of biomarkers predictive of HFS, including baseline folate and vitamin B12 levels, as well as genetic polymorphisms with genome-wide arrays. Results:In this cohort of 210 patients (median [range] age, 58 [26-82] years; 162 women) grade 2 or higher HFS occurred in 33 patients (31.4%) in the pyridoxine arm vs 39 patients (37.1%) in the placebo arm (P?=?.38). The median time to onset of grade 2 or higher HFS was not reached in both arms. In univariate analysis, the starting dose of capecitabine (odds ratio [OR], 1.99; 95% CI, 1.32-3.00; P?=?.001), serum folate levels (OR, 1.27; 95% CI, 1.10-1.47; P?=?.001), and red blood cell folate levels (OR, 1.25; 95% CI, 1.08-1.44; P?=?.003) were associated with increased risk of grade 2 or higher HFS. In multivariate analyses, serum folate (OR, 1.30; 95% CI, 1.12-1.52; P?<?.001) and red blood cell folate (OR, 1.28; 95% CI, 1.10-1.49; P?=?.001) were the only significant predictors of grade 2 or higher HFS. Grade 2 or higher HFS was associated with 300 DNA variants at genome-wide significance (P?<?5?×?10-8), including a novel DPYD variant (rs75267292; P?=?1.57?×?10-10), and variants in the MACF1 (rs183324967, P?=?4.80?×?10-11; rs148221738, P?=?5.73?×?10-10) and SPRY2 (rs117876855, P?<?1.01?×?10-8; rs139544515, P?=?1.30?×?10-8) genes involved in wound healing. Conclusions and Relevance:Pyridoxine did not significantly prevent or delay the onset of grade 2 or higher HFS. Serum and red blood cell folate levels are independent predictors of HFS. Trial Registration:clinicaltrials.gov Identifier: NCT00486213.

Dataset Information

Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome.

Publications

Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome.

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