NM_018196.4:c.693C>T

Variant names:

• chrX-155511738-G-A
• NM_018196.4:c.693C>T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_018196.4(TMLHE):​c.693C>T​(p.Asp231Asp) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000092 in 1,087,000 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.2e-7 (0 hom. 1 hem.)
• Consequence: TMLHE NM_018196.4 synonymous
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.23

Genes affected

TMLHE (HGNC:18308): (trimethyllysine hydroxylase, epsilon) This gene encodes the protein trimethyllysine dioxygenase which is the first enzyme in the carnitine biosynthesis pathway. Carnitine play an essential role in the transport of activated fatty acids across the inner mitochondrial membrane. The encoded protein converts trimethyllysine into hydroxytrimethyllysine. A pseudogene of this gene is found on chromosome X. Alternate splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

TMLHE-AS1 (HGNC:44261): (TMLHE antisense RNA 1)

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.45).
• BP7: Synonymous conserved (PhyloP=3.23 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMLHE	NM_018196.4	c.693C>T	p.Asp231Asp	synonymous_variant	Exon 5 of 8	ENST00000334398.8	NP_060666.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMLHE	ENST00000334398.8	c.693C>T	p.Asp231Asp	synonymous_variant	Exon 5 of 8	1	NM_018196.4	ENSP00000335261.3
TMLHE	ENST00000369439.4	c.693C>T	p.Asp231Asp	synonymous_variant	Exon 5 of 7	1		ENSP00000358447.4
TMLHE	ENST00000675642.1	c.726C>T	p.Asp242Asp	synonymous_variant	Exon 6 of 9			ENSP00000502604.1
TMLHE-AS1	ENST00000452506.1	n.67+22349G>A		intron_variant	Intron 1 of 1	5

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.20e-7 AC: 1 AN: 1087000 Hom.: 0 Cov.: 28 AF XY: 0.00000282 AC XY: 1 AN XY: 354410

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000286

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Oct 17, 2022

Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.45
CADD	Benign	3.3
DANN	Benign	0.91

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-154741399;