chr11-2166989-C-T

Variant names:

• chr11-2166989-C-T
• rs373283527
• NM_000360.4:c.739G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000360.4(TH):​c.739G>A​(p.Ala247Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000695 in 1,437,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: TH NM_000360.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.45

Genes affected

TH (HGNC:11782): (tyrosine hydroxylase) The protein encoded by this gene is involved in the conversion of tyrosine to dopamine. It is the rate-limiting enzyme in the synthesis of catecholamines, hence plays a key role in the physiology of adrenergic neurons. Mutations in this gene have been associated with autosomal recessive Segawa syndrome. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TH	NM_000360.4	c.739G>A	p.Ala247Thr	missense_variant	Exon 7 of 13	ENST00000352909.8	NP_000351.2
TH	NM_199292.3	c.832G>A	p.Ala278Thr	missense_variant	Exon 8 of 14		NP_954986.2
TH	NM_199293.3	c.820G>A	p.Ala274Thr	missense_variant	Exon 8 of 14		NP_954987.2
TH	XM_011520335.3	c.751G>A	p.Ala251Thr	missense_variant	Exon 7 of 13		XP_011518637.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TH	ENST00000352909.8	c.739G>A	p.Ala247Thr	missense_variant	Exon 7 of 13	1	NM_000360.4	ENSP00000325951.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.95e-7 AC: 1 AN: 1437860 Hom.: 0 Cov.: 65 AF XY: 0.00 AC XY: 0 AN XY: 713096

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 9.08e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Apr 30, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: TH c.832G>A (p.Ala278Thr) results in a non-conservative amino acid change located in the Aromatic amino acid hydroxylase, C-terminal domain (IPR019774) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The frequency data for this variant in gnomAD is considered unreliable, as metrics indicate poor data quality at this position. c.832G>A has been reported in the literature in an individual affected with Segawa Syndrome, Autosomal Recessive (Wang_2022). These data do not allow any conclusion about variant significance. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. This variant is also known as c.739G>A(p.A247T). The following publication have been ascertained in the context of this evaluation (PMID: 36568392). ClinVar contains an entry for this variant (Variation ID: 2174771). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Autosomal recessive DOPA responsive dystonia Uncertain:1

Jun 08, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 278 of the TH protein (p.Ala278Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TH-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TH protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D;.;.
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	3.3	M;.;.
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-3.7	D;D;D
REVEL	Pathogenic	0.95
Sift	Uncertain	0.014	D;D;D
Sift4G	Uncertain	0.048	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.88
MutPred		0.87		Gain of phosphorylation at A278 (P = 0.0463);.;.;
MVP		0.98
MPC		0.31
ClinPred		0.99	D
GERP RS		3.2
Varity_R		0.77
gMVP		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

LitVar

Other links and lift over

dbSNP: rs373283527; hg19: chr11-2188219;