11-72106017-C-G

Position:

• chr11-72106017-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001393500.2(TOMT):​c.66C>G​(p.His22Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TOMT NM_001393500.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.56

Genes affected

TOMT (HGNC:55527): (transmembrane O-methyltransferase) This gene encodes a catechol-O-methyltransferase that catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to a hydroxyl group of catechols and is essential for auditory and vestibular function. Mutations in this gene have been associated with nonsyndromic deafness. Readthrough transcription is observed across this gene and the adjacent leucine-rich repeat containing 51 gene. A third locus (GeneID:220074) is defined to represent the readthrough transcripts. [provided by RefSeq, Feb 2021]

LRTOMT (HGNC:25033): (leucine rich transmembrane and O-methyltransferase domain containing) This locus represents naturally occurring readthrough transcription between the neighboring LRRC51 (leucine-rich repeat containing 51) and TOMT (transmembrane O-methyltransferase) genes on chromosome 11. The readthrough transcript encodes a fusion protein that shares sequence identity with each individual gene product. Multiple reports implicate mutations in this gene in nonsyndromic deafness.[provided by RefSeq, Feb 2021]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TOMT	NM_001393500.2	c.66C>G	p.His22Gln	missense_variant	1/3	ENST00000541899.3	NP_001380429.1
LRTOMT	NM_001145308.5	c.165C>G	p.His55Gln	missense_variant	5/7		NP_001138780.1
LRTOMT	NM_001145309.4	c.165C>G	p.His55Gln	missense_variant	7/9		NP_001138781.1
LRTOMT	NM_001145310.4	c.84-39C>G		intron_variant			NP_001138782.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TOMT	ENST00000541899.3	c.66C>G	p.His22Gln	missense_variant	1/3	5	NM_001393500.2	ENSP00000494667.1
LRTOMT	ENST00000307198.11	c.165C>G	p.His55Gln	missense_variant	5/7	2		ENSP00000305742.7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 31, 2015

The p.His55Gln variant in LRTOMT has not been reported in any individual with he aring loss or in large population studies. Computational prediction tools and co nservation analysis do not provide strong support for or against an impact to th e protein. In summary, the clinical significance of the p.His55Gln variant is un certain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.090
CADD	Benign	18
DANN	Uncertain	0.98
DEOGEN2	Benign	0.11	T;T;.
Eigen	Benign	0.020
Eigen_PC	Benign	0.0076
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.79	T;.;T
M_CAP	Uncertain	0.087	D
MetaRNN	Uncertain	0.55	D;D;D
MetaSVM	Uncertain	-0.23	T
MutationAssessor	Benign	1.7	L;L;.
MutationTaster	Benign	1.0	D;D;N;N
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.3	N;N;.
REVEL	Uncertain	0.60
Sift	Benign	0.29	T;T;.
Sift4G	Benign	0.38	T;T;.
Polyphen		0.99	D;D;.
Vest4		0.55
MutPred		0.40		Loss of sheet (P = 0.0063);Loss of sheet (P = 0.0063);.;
MVP		0.89
MPC		0.39
ClinPred		0.69	D
GERP RS		1.5
Varity_R		0.098
gMVP		0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.57		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.57		Position offset: 1

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

Publications

LitVar

Other links and lift over

dbSNP: rs727503152; hg19: chr11-71817063;