4-183679350-C-T

Variant names:

• chr4-183679350-C-T
• rs368922437
• NM_021942.6:c.832-3C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021942.6(TRAPPC11):​c.832-3C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,417,274 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: TRAPPC11 NM_021942.6 splice_region, intron
• Scores: Splicing: ADA: 0.5896
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.16
• Publications: 0 publications found

Genes affected

TRAPPC11 (HGNC:25751): (trafficking protein particle complex subunit 11) The protein encoded by this gene is a subunit of the TRAPP (transport protein particle) tethering complex, which functions in intracellular vesicle trafficking. This subunit is involved in early stage endoplasmic reticulum-to-Golgi vesicle transport. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Jan 2013]

TRAPPC11 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive limb-girdle muscular dystrophy type R18

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P, Orphanet
• intellectual disability-hyperkinetic movement-truncal ataxia syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• triple-A syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.23).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021942.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC11	NM_021942.6	MANE Select	c.832-3C>T		splice_region intron	N/A	NP_068761.4
	TRAPPC11	NM_199053.3		c.832-3C>T		splice_region intron	N/A	NP_951008.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC11	ENST00000334690.11	TSL:1 MANE Select	c.832-3C>T		splice_region intron	N/A	ENSP00000335371.6
	TRAPPC11	ENST00000357207.8	TSL:1	c.832-3C>T		splice_region intron	N/A	ENSP00000349738.4
	TRAPPC11	ENST00000505676.5	TSL:1	n.163-858C>T		intron	N/A	ENSP00000422915.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.06e-7 AC: 1 AN: 1417274 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 702656

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 31290

American (AMR) AF: 0.00 AC: 0 AN: 35060

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24484

East Asian (EAS) AF: 0.00 AC: 0 AN: 38448

South Asian (SAS) AF: 0.00 AC: 0 AN: 77840

European-Finnish (FIN) AF: 0.0000190 AC: 1 AN: 52508

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5578

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1093562

Other (OTH) AF: 0.00 AC: 0 AN: 58504

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.23
CADD	Benign	16
DANN	Benign	0.90
PhyloP100		1.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.59
dbscSNV1_RF	Benign	0.26
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs368922437; hg19: chr4-184600503;