2-232548110-A-T

Variant names:

• chr2-232548110-A-T
• rs4973539
• NM_145702.4:c.1773T>A

Variant summary

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

The NM_145702.4(TIGD1):​c.1773T>A​(p.Asp591Glu) variant causes a missense 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. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TIGD1 NM_145702.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.504
• Publications: 11 publications found

Genes affected

TIGD1 (HGNC:14523): (tigger transposable element derived 1) The protein encoded by this gene belongs to the tigger subfamily of the pogo superfamily of DNA-mediated transposons in humans. These proteins are related to DNA transposons found in fungi and nematodes, and more distantly to the Tc1 and mariner transposases. They are also very similar to the major mammalian centromere protein B. The exact function of this gene is not known. [provided by RefSeq, Jul 2008]

CHRNG (HGNC:1967): (cholinergic receptor nicotinic gamma subunit) The mammalian muscle-type acetylcholine receptor is a transmembrane pentameric glycoprotein with two alpha subunits, one beta, one delta, and one epsilon (in adult skeletal muscle) or gamma (in fetal and denervated muscle) subunit. This gene, which encodes the gamma subunit, is expressed prior to the thirty-third week of gestation in humans. The gamma subunit of the acetylcholine receptor plays a role in neuromuscular organogenesis and ligand binding and disruption of gamma subunit expression prevents the correct localization of the receptor in cell membranes. Mutations in this gene cause Escobar syndrome and a lethal form of multiple pterygium syndrome. Muscle-type acetylcholine receptor is the major antigen in the autoimmune disease myasthenia gravis.[provided by RefSeq, Sep 2009]

CHRNG Gene-Disease associations (from GenCC):

• autosomal recessive multiple pterygium syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Orphanet
• CHRNG-associated hypo-akinesia disorder of prenatal onset

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• lethal multiple pterygium syndrome

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• transient neonatal myasthenia gravis

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp

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 (MetaRNN=0.09805232).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_145702.4. 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
	TIGD1	NM_145702.4	MANE Select	c.1773T>A	p.Asp591Glu	missense	Exon 1 of 1	NP_663748.1	Q96MW7
	CHRNG	NM_005199.5	MANE Select	c.*2394A>T		3_prime_UTR	Exon 12 of 12	NP_005190.4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TIGD1	ENST00000408957.7	TSL:6 MANE Select	c.1773T>A	p.Asp591Glu	missense	Exon 1 of 1	ENSP00000386186.3	Q96MW7
	CHRNG	ENST00000651502.1	MANE Select	c.*2394A>T		3_prime_UTR	Exon 12 of 12	ENSP00000498757.1	P07510-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 8

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 5149

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	11
DANN	Benign	0.96
DEOGEN2	Benign	0.011	T
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.66
FATHMM_MKL	Benign	0.032	N
LIST_S2	Benign	0.35	T
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.098	T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	2.0	M
PhyloP100		0.50
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.040	N
REVEL	Benign	0.046
Sift	Benign	0.14	T
Sift4G	Benign	0.086	T
Polyphen		0.64	P
Vest4		0.15
MutPred		0.16		Loss of MoRF binding (P = 0.0919)
MVP		0.030
ClinPred		0.51	D
GERP RS		0.43
Varity_R		0.15
gMVP		0.018
Mutation Taster		=98/2	polymorphism

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

Other links and lift over

dbSNP: rs4973539; hg19: chr2-233412820;