chr8-115604318-GGC-G

Position:

• chr8-115604318-GGC-G

Variant summary

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

The NM_014112.5(TRPS1):​c.1649_1650del​(p.Gly550AlafsTer2) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. G550G) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TRPS1 NM_014112.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.75

Genes affected

TRPS1 (HGNC:12340): (transcriptional repressor GATA binding 1) This gene encodes a transcription factor that represses GATA-regulated genes and binds to a dynein light chain protein. Binding of the encoded protein to the dynein light chain protein affects binding to GATA consensus sequences and suppresses its transcriptional activity. Defects in this gene are a cause of tricho-rhino-phalangeal syndrome (TRPS) types I-III. [provided by RefSeq, Jul 2008]

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 8-115604318-GGC-G is Pathogenic according to our data. Variant chr8-115604318-GGC-G is described in ClinVar as [Pathogenic]. Clinvar id is 468199.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TRPS1	NM_014112.5	c.1649_1650del	p.Gly550AlafsTer2	frameshift_variant	4/7	ENST00000395715.8
TRPS1	NM_001282902.3	c.1622_1623del	p.Gly541AlafsTer2	frameshift_variant	3/6
TRPS1	NM_001282903.3	c.1628_1629del	p.Gly543AlafsTer2	frameshift_variant	4/7
TRPS1	NM_001330599.2	c.1610_1611del	p.Gly537AlafsTer2	frameshift_variant	3/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TRPS1	ENST00000395715.8	c.1649_1650del	p.Gly550AlafsTer2	frameshift_variant	4/7	1	NM_014112.5	A1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Trichorhinophalangeal dysplasia type I;C1860823:Trichorhinophalangeal syndrome, type III Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 31, 2017

This sequence change deletes 2 nucleotides from exon 4 of the TRPS1 mRNA (c.1649_1650delGC), causing a frameshift at codon 550. This creates a premature translational stop signal (p.Gly550Alafs*2) and is expected to result in an absent or disrupted protein product. While this particular variant has not been reported in the literature, loss-of-function variants in TRPS1 are known to be pathogenic (PMID: 15367484). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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: rs1554596063; hg19: chr8-116616545;