rs1553240735

Positions:

• chr1-179882679-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_015602.4(TOR1AIP1):​c.177C>A​(p.Phe59Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000276 in 1,450,102 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: 31)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: TOR1AIP1 NM_015602.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0690

Genes affected

TOR1AIP1 (HGNC:29456): (torsin 1A interacting protein 1) This gene encodes a type 2 integral membrane protein that binds A- and B-type lamins. The encoded protein localizes to the inner nuclear membrane and may be involved in maintaining the attachment of the nuclear membrane to the nuclear lamina during cell division. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30535692).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TOR1AIP1	NM_015602.4	c.177C>A	p.Phe59Leu	missense_variant	1/10	ENST00000606911.7	NP_056417.2
TOR1AIP1	NM_001267578.2	c.177C>A	p.Phe59Leu	missense_variant	1/10		NP_001254507.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TOR1AIP1	ENST00000606911.7	c.177C>A	p.Phe59Leu	missense_variant	1/10	1	NM_015602.4	ENSP00000476687.1
TOR1AIP1	ENST00000271583.7	c.177C>A	p.Phe59Leu	missense_variant	1/11	5		ENSP00000271583.3
TOR1AIP1	ENST00000528443.6	c.177C>A	p.Phe59Leu	missense_variant	1/10	2		ENSP00000435365.2
TOR1AIP1	ENST00000435319.8	c.-187C>A		upstream_gene_variant		1		ENSP00000393292.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000276 AC: 4 AN: 1450102 Hom.: 0 Cov.: 30 AF XY: 0.00000278 AC XY: 2 AN XY: 720480

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000695

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.05e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2Y Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 26, 2023

This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 59 of the TOR1AIP1 protein (p.Phe59Leu). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 542850). This variant has not been reported in the literature in individuals affected with TOR1AIP1-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.045	T
BayesDel_noAF	Benign	-0.17
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.21	.;.;T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.65	D
LIST_S2	Benign	0.86	D;D;D
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.31	T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	2.0	M;.;M
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-2.2	N;N;.
REVEL	Benign	0.17
Sift	Pathogenic	0.0	D;D;.
Sift4G	Pathogenic	0.0	D;D;T
Polyphen		1.0	.;.;D
Vest4		0.47
MutPred		0.41		Gain of MoRF binding (P = 0.1118);Gain of MoRF binding (P = 0.1118);Gain of MoRF binding (P = 0.1118);
MVP		0.48
MPC		0.55
ClinPred		0.99	D
GERP RS		-0.21
Varity_R		0.26
gMVP		0.11

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: rs1553240735; hg19: chr1-179851814;