chr22-37724918-C-T

Variant names:

• chr22-37724918-C-T
• rs118204029
• NM_001039141.3:c.2362C>T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001039141.3(TRIOBP):​c.2362C>T​(p.Arg788*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000889 in 1,461,780 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: TRIOBP NM_001039141.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 0.0130

Genes affected

TRIOBP (HGNC:17009): (TRIO and F-actin binding protein) This gene encodes a protein with an N-terminal pleckstrin homology domain and a C-terminal coiled-coil region. The protein interacts with trio, which is involved with neural tissue development and controlling actin cytoskeleton organization, cell motility and cell growth. The protein also associates with F-actin and stabilizes F-actin structures. Mutations in this gene have been associated with a form of autosomal recessive nonsyndromic deafness. Multiple alternatively spliced transcript variants that would encode different isoforms have been found for this gene, however some transcripts may be subject to nonsense-mediated decay (NMD). [provided by RefSeq, Nov 2008]

ENSG00000100101 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 22-37724918-C-T is Pathogenic according to our data. Variant chr22-37724918-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1493.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr22-37724918-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRIOBP	NM_001039141.3	c.2362C>T	p.Arg788*	stop_gained	Exon 7 of 24	ENST00000644935.1	NP_001034230.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRIOBP	ENST00000644935.1	c.2362C>T	p.Arg788*	stop_gained	Exon 7 of 24		NM_001039141.3	ENSP00000496394.1
ENSG00000100101	ENST00000455236.4	n.*2698C>T		non_coding_transcript_exon_variant	Exon 13 of 13	5		ENSP00000477208.1
ENSG00000100101	ENST00000455236.4	n.*2698C>T		3_prime_UTR_variant	Exon 13 of 13	5		ENSP00000477208.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.0000200 AC: 5 AN: 249572 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135406

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000111

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000928

Gnomad NFE exome AF: 0.00000883

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000889 AC: 13 AN: 1461780 Hom.: 0 Cov.: 147 AF XY: 0.00000413 AC XY: 3 AN XY: 727196

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000562

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome Cov.: 31

Bravo AF: 0.0000113

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000120 AC: 1

ExAC AF: 0.0000331 AC: 4

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 28 Pathogenic:1

Jan 01, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:1

Apr 09, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg788*) in the TRIOBP gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TRIOBP are known to be pathogenic (PMID: 16385457, 16385458, 20510926). This variant is present in population databases (rs118204029, gnomAD 0.01%). This premature translational stop signal has been observed in individual(s) with deafness (PMID: 16385457). ClinVar contains an entry for this variant (Variation ID: 1493). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Pathogenic	0.15
CADD	Pathogenic	28
DANN	Uncertain	0.98
Eigen	Benign	-0.28
Eigen_PC	Benign	-0.70
FATHMM_MKL	Benign	0.013	N
Vest4		0.40
GERP RS		-2.6

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: rs118204029; hg19: chr22-38120925;