chr3-12154401-C-T

Position:

• chr3-12154401-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003256.4(TIMP4):​c.403G>A​(p.Glu135Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000253 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: TIMP4 NM_003256.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.46

Genes affected

TIMP4 (HGNC:11823): (TIMP metallopeptidase inhibitor 4) This gene belongs to the TIMP gene family. The proteins encoded by this gene family are inhibitors of the matrix metalloproteinases, a group of peptidases involved in degradation of the extracellular matrix. The secreted, netrin domain-containing protein encoded by this gene is involved in regulation of platelet aggregation and recruitment and may play role in hormonal regulation and endometrial tissue remodeling. [provided by RefSeq, Jul 2008]

SYN2 (HGNC:11495): (synapsin II) This gene is a member of the synapsin gene family. Synapsins encode neuronal phosphoproteins which associate with the cytoplasmic surface of synaptic vesicles. Family members are characterized by common protein domains, and they are implicated in synaptogenesis and the modulation of neurotransmitter release, suggesting a potential role in several neuropsychiatric diseases. This member of the synapsin family encodes a neuron-specific phosphoprotein that selectively binds to small synaptic vesicles in the presynaptic nerve terminal. Polymorphisms in this gene are associated with abnormal presynaptic function and related neuronal disorders, including autism, epilepsy, bipolar disorder and schizophrenia. Alternative splicing of this gene results in multiple transcript variants. The tissue inhibitor of metalloproteinase 4 gene is located within an intron of this gene and is transcribed in the opposite direction. [provided by RefSeq, Feb 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.18531072).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TIMP4	NM_003256.4	c.403G>A	p.Glu135Lys	missense_variant	4/5	ENST00000287814.5
SYN2	NM_133625.6	c.774+3075C>T		intron_variant		ENST00000621198.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TIMP4	ENST00000287814.5	c.403G>A	p.Glu135Lys	missense_variant	4/5	1	NM_003256.4	P1
SYN2	ENST00000621198.5	c.774+3075C>T		intron_variant		1	NM_133625.6	P2
SYN2	ENST00000620175.4	c.774+3075C>T		intron_variant		1		A2
SYN2	ENST00000439861.5	n.225+3075C>T		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000676 AC: 17 AN: 251480 Hom.: 0 AF XY: 0.0000441 AC XY: 6 AN XY: 135914

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000867

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000707

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000253 AC: 37 AN: 1461888 Hom.: 0 Cov.: 31 AF XY: 0.0000193 AC XY: 14 AN XY: 727246

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000112

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000327

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000153

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000434 Hom.: 0

Bravo AF: 0.0000604

ExAC AF: 0.0000494 AC: 6

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 29, 2023

The c.403G>A (p.E135K) alteration is located in exon 4 (coding exon 4) of the TIMP4 gene. This alteration results from a G to A substitution at nucleotide position 403, causing the glutamic acid (E) at amino acid position 135 to be replaced by a lysine (K). 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	-0.14	T
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.53	D
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.11	D
MetaRNN	Benign	0.19	T
MetaSVM	Uncertain	-0.12	T
MutationAssessor	Benign	2.0	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.42
Sift	Benign	0.48	T
Sift4G	Benign	0.73	T
Polyphen		0.10	B
Vest4		0.54
MutPred		0.62		Gain of ubiquitination at E135 (P = 0.0369);
MVP		0.76
MPC		0.078
ClinPred		0.032	T
GERP RS		3.1
Varity_R		0.18
gMVP		0.77

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: rs748777885; hg19: chr3-12195901;