A8315C

# **General Information**

| **Position** | **8315** | **Variant** | **m.8315A\>C** | **Locus** | **MT\-TK** | **RNA** | **tRNA Lys** |
| --- | --- | --- | --- | --- | --- | --- | --- |
| **Homoplasmy** | \- | **Heteroplasmy** | \+ | **mitoTIP** | 22\.00% | **Pathogenicity** | Reported |

"Pathogenicity" status is derived from published literature or predictions from bioinformatics tools. Researchers and clinicians are cautioned that additional data and/or analysis may still be necessary to confirm the pathological significance of these variants. For more information, please see [Mitofam Info](https://mitofam.com/doc/385/).

# **Pedigree Information**

The **m.8315A\>C** variant in MT\-TK has been reported in 1 pedigree. To date, 1 carrier has been reported. Reported mutation loads ranged from 71% to 96%, with a median of 85\.5% overall; affected carriers showed mutation loads from 71% to 96%, with a median of 85\.5%. The main clinical manifestations among affected carriers included mERRF syndrome, epilepsy, hearing impairment, muscle weakness, and myoclonus.

| **No.** | **Position** | **Variant** | **Family ID** | **Nationality** | **Diseases** | **Unaffected Maternal Relatives** | **Affected Maternal Relatives** | **Publication Year** | **PMID/Ref** | **Note** |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 8315 | m.8315A\>C | A8315C\-F1 | Czech Republic | MERRF syndrome | 0 | 0 | 2022 | [35886028](https://pubmed.ncbi.nlm.nih.gov/35886028/) | / |

# **Carrier Information**

| **No.** | **Position** | **Variant** | **Family ID** | **Carrier ID** | **Type (Fam/De novo/Uninf)** | **Gender (F/M)** | **Proband (Y/N)** | **Affected (Y/N)** | **Die/Alive(D/A)** | **Age** | **Blood Mutant Level** | **Muscle Mutant level** | **Urine Mutant level** | **Other Mutant level** | **Clinical Features** | **Note** |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 8315 | m.8315A\>C | A8315C\-F1 | A8315C\-F1\-P1 | Uninf | F | Y | Y | A | 39 | 71% | 85% | / | 86% (BM); \>96% (H) | MERRF syndrome; myoclonus; epilepsy; muscle weakness; hearing impairment | Only child of healthy unrelated parents; mother deceased, no siblings or children available for testing. |

For abbreviations and other usage instructions, please see [Mitofam Info](https://mitofam.com/doc/385/).