An Unusual Melting Curve on a LightCycler Due to a New Mutation in Methylenetetrahydrofolate Reductase
Bibliographic record
Abstract
Methylenetetrahydrofolate reductase (MTHFR; E.C. 1.5.1.20) catalyzes the reduction of 5,10-methylenetetrahydofolate to 5-methytetrahydrofolate, and its activity is affected by a number of polymorphisms and mutations, the best known being MTHFR c.677C > T (OMIM 607093.003). The c.677C > T mutation is often analyzed by melting curve analysis after real-time polymerase chain reaction. We observed in one patient upon dual hybridization probe analysis in a Roche LightCycler 1.2 an unusual melting curve peak at 53.4 degrees C instead of one expected at either 51.6 degrees C or 60.4 degrees C. We sequenced the region of MTHFR interrogated by the dual hybridization probes, which revealed a c.685A > G base substitution that would result in an Ile225Val substitution. In conclusion, we identified the cause of an unusual melting curve in a commonly used genotyping technique for MTHFR c.677C > T as due to a novel mutation highlighting the ability of melting analysis to identify new sequence variants.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".