Genetic Variant TCHH:p.Gln1866Arg (chr1-152107620-T-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_007113.4(TCHH):c.5597A>G(p.Gln1866Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000113 in 1,614,062 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00011 ( 0 hom. )

Consequence

TCHH
NM_007113.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.644

Variant links:

Genes affected

TCHH (HGNC:11791): (trichohyalin) The protein encoded by this gene forms crosslinked complexes with itself and keratin intermediate filaments to provide mechanical strength to the hair follicle inner root sheath. The encoded protein also is important for structural integrity of the filiform papillae of the tongue. Defects in this gene are a cause of uncombable hair syndrome. [provided by RefSeq, Feb 2017]

TCHH links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.027246416).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCHH	NM_007113.4 link	c.5597A>G	p.Gln1866Arg	missense_variant	Exon 3 of 3	ENST00000614923.2	NP_009044.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCHH	ENST00000614923.2 link	c.5597A>G	p.Gln1866Arg	missense_variant	Exon 3 of 3	5	NM_007113.4	ENSP00000480484.1		Q07283

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000164

AC:

AN:

249564

Hom.:

AF XY:

0.000214

AC XY:

AN XY:

135398

show subpopulations

Gnomad AFR exome

AF:

0.000129

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000556

Gnomad SAS exome

AF:

0.000915

Gnomad FIN exome

AF:

0.0000464

Gnomad NFE exome

AF:

0.0000794

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000114

AC:

166

AN:

1461874

Hom.:

Cov.:

110

AF XY:

0.000146

AC XY:

106

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.000962

Gnomad4 FIN exome

AF:

0.0000375

Gnomad4 NFE exome

AF:

0.0000612

Gnomad4 OTH exome

AF:

0.000132

GnomAD4 genome

AF:

0.000112

AC:

AN:

152188

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00104

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000226

Hom.:

Bravo

AF:

0.0000642

ExAC

AF:

0.000182

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 29, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.5597A>G (p.Q1866R) alteration is located in exon 2 (coding exon 2) of the TCHH gene. This alteration results from a A to G substitution at nucleotide position 5597, causing the glutamine (Q) at amino acid position 1866 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.52

CADD

Benign

DANN

Benign

0.48

DEOGEN2

Benign

0.0011

T;T

Eigen

Benign

-0.55

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.24

LIST_S2

Benign

0.28

.;T

M_CAP

Benign

0.0032

MetaRNN

Benign

0.027

T;T

MetaSVM

Benign

-0.94

MutationAssessor

Benign

1.5

L;L

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.41

N;.

REVEL

Benign

0.043

Sift

Pathogenic

0.0

D;.

Sift4G

Benign

0.89

T;T

Polyphen

0.59

P;P

Vest4

0.087

MVP

0.52

MPC

0.32

ClinPred

0.17

GERP RS

2.8

Varity_R

0.15

gMVP

0.0058

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over