chr1-231542609-C-T

Variant names:

• chr1-231542609-C-T
• rs745984318
• NM_005999.3:c.365C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_005999.3(TSNAX):​c.365C>T​(p.Thr122Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,258 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: TSNAX NM_005999.3 missense, splice_region
• Scores: Splicing: ADA: 0.003688
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.79
• Publications: 0 publications found

Genes affected

TSNAX (HGNC:12380): (translin associated factor X) This gene encodes a protein which specifically interacts with translin, a DNA-binding protein that binds consensus sequences at breakpoint junctions of chromosomal translocations. The encoded protein contains bipartite nuclear targeting sequences that may provide nuclear transport for translin, which lacks any nuclear targeting motifs. [provided by RefSeq, Jul 2008]

TSNAX-DISC1 (HGNC:49177): (TSNAX-DISC1 readthrough (NMD candidate)) This gene represents naturally occurring read-through transcription between the neighboring TSNAX (translin-associated factor X) and DISC1 (disrupted in schizophrenia 1) genes on chromosome 1. Alternative splicing results in multiple transcript variants, all of which are candidates for nonsense-mediated mRNA decay (NMD) and are unlikely to be protein-coding. These alterations in gene processing may be associated with risk for psychiatric illness, most notably, schizophrenia. [provided by RefSeq, Nov 2010]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.21761751).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSNAX	NM_005999.3	c.365C>T	p.Thr122Ile	missense_variant, splice_region_variant	Exon 4 of 6	ENST00000366639.9	NP_005990.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSNAX	ENST00000366639.9	c.365C>T	p.Thr122Ile	missense_variant, splice_region_variant	Exon 4 of 6	1	NM_005999.3	ENSP00000355599.3
TSNAX-DISC1	ENST00000602956.5	n.365C>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 4 of 13	2		ENSP00000473532.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000282 AC: 7 AN: 248584 AF XY: 0.0000372

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000381

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461258 Hom.: 0 Cov.: 30 AF XY: 0.00000825 AC XY: 6 AN XY: 726936

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44666

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.000252 AC: 10 AN: 39634

South Asian (SAS) AF: 0.00 AC: 0 AN: 86182

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53392

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111684

Other (OTH) AF: 0.00 AC: 0 AN: 60368

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000302

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jun 10, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.365C>T (p.T122I) alteration is located in exon 4 (coding exon 4) of the TSNAX gene. This alteration results from a C to T substitution at nucleotide position 365, causing the threonine (T) at amino acid position 122 to be replaced by an isoleucine (I). 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	0.32
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.24	T;.
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.25
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.85	T;T
M_CAP	Benign	0.0054	T
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;.
PhyloP100		2.8
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-2.1	N;N
REVEL	Benign	0.17
Sift	Uncertain	0.027	D;D
Sift4G	Uncertain	0.0040	D;D
Polyphen		0.023	B;.
Vest4		0.23
MutPred		0.63		Gain of stability (P = 0.0644);.;
MVP		0.068
MPC		0.38
ClinPred		0.16	T
GERP RS		1.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.2
Varity_R		0.11
gMVP		0.43
Mutation Taster		=75/25	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0037
dbscSNV1_RF	Benign	0.14
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: rs745984318; hg19: chr1-231678355;