7-100158248-C-A

Variant names:

• chr7-100158248-C-A
• NM_018275.5:c.252G>T
• TRAPPC14 p.Ser84Ser

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_018275.5(TRAPPC14):​c.252G>T​(p.Ser84Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S84S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TRAPPC14 NM_018275.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.824
• Publications: 0 publications found

Genes affected

TRAPPC14 (HGNC:25604): (trafficking protein particle complex subunit 14) Enables alpha-tubulin binding activity. Involved in cilium assembly and regulation of cell population proliferation. Located in several cellular components, including microtubule cytoskeleton; midbody; and plasma membrane. Part of TRAPPII protein complex. Implicated in primary autosomal recessive microcephaly. [provided by Alliance of Genome Resources, Apr 2022]

TRAPPC14 Gene-Disease associations (from GenCC):

• autosomal recessive primary microcephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.37).
• BP7: Synonymous conserved (PhyloP=-0.824 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018275.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC14	NM_018275.5	MANE Select	c.252G>T	p.Ser84Ser	synonymous	Exon 1 of 11	NP_060745.3
	TRAPPC14	NM_001303470.2		c.-396-310G>T		intron	N/A	NP_001290399.1	B3KNS5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC14	ENST00000316937.8	TSL:1 MANE Select	c.252G>T	p.Ser84Ser	synonymous	Exon 1 of 11	ENSP00000324741.3	Q8WVR3-1
	TRAPPC14	ENST00000950372.1		c.252G>T	p.Ser84Ser	synonymous	Exon 1 of 11	ENSP00000620431.1
	TRAPPC14	ENST00000950373.1		c.252G>T	p.Ser84Ser	synonymous	Exon 1 of 11	ENSP00000620432.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1335332 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 656814

African (AFR) AF: 0.00 AC: 0 AN: 27580

American (AMR) AF: 0.00 AC: 0 AN: 28336

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22680

East Asian (EAS) AF: 0.00 AC: 0 AN: 31594

South Asian (SAS) AF: 0.00 AC: 0 AN: 74358

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 32928

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4784

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1057630

Other (OTH) AF: 0.00 AC: 0 AN: 55442

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.37
CADD	Benign	11
DANN	Benign	0.95
PhyloP100		-0.82
PromoterAI		0.00050	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr7-99755871;