NM_001099274.3:c.850A>G

Variant names:

• chr14-24240630-T-C
• rs199422314
• NM_001099274.3:c.850A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PP3 PP5_Moderate

The NM_001099274.3(TINF2):​c.850A>G​(p.Thr284Ala) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T284K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TINF2 NM_001099274.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 3.58
• Publications: 8 publications found

Genes affected

TINF2 (HGNC:11824): (TERF1 interacting nuclear factor 2) This gene encodes one of the proteins of the shelterin, or telosome, complex which protects telomeres by allowing the cell to distinguish between telomeres and regions of DNA damage. The protein encoded by this gene is a critical part of shelterin; it interacts with the three DNA-binding proteins of the shelterin complex, and it is important for assembly of the complex. Mutations in this gene cause dyskeratosis congenita (DKC), an inherited bone marrow failure syndrome. [provided by RefSeq, Mar 2010]

TINF2 Gene-Disease associations (from GenCC):

• dyskeratosis congenita, autosomal dominant 3

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Revesz syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, PanelApp Australia, Orphanet
• pulmonary fibrosis

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• dyskeratosis congenita

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Hoyeraal-Hreidarsson syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• thyroid gland papillary carcinoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_001099274.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.803
• PP5: Variant 14-24240630-T-C is Pathogenic according to our data. Variant chr14-24240630-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 38923.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TINF2	NM_001099274.3	c.850A>G	p.Thr284Ala	missense_variant	Exon 6 of 9	ENST00000267415.12	NP_001092744.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TINF2	ENST00000267415.12	c.850A>G	p.Thr284Ala	missense_variant	Exon 6 of 9	1	NM_001099274.3	ENSP00000267415.7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.0362 Hom.: 0

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dyskeratosis congenita Pathogenic:1

Mar 22, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C55"). ClinVar contains an entry for this variant (Variation ID: 38923). This missense change has been observed in individual(s) with clinical features of dyskeratosis congenita (PMID: 18669893; Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 284 of the TINF2 protein (p.Thr284Ala). -

Dyskeratosis congenita, autosomal dominant 1 Other:1

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.26	T;.;T;.;.;T
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Uncertain	0.79	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.80	D;D;D;D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Benign	1.8	L;L;L;.;.;.
PhyloP100		3.6
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.4	.;N;N;.;.;D
REVEL	Pathogenic	0.82
Sift	Benign	0.030	.;D;D;.;.;D
Sift4G	Pathogenic	0.0	.;D;D;.;.;.
Polyphen		1.0	D;.;D;D;.;.
Vest4		0.44, 0.77
MutPred		0.73		Loss of phosphorylation at T284 (P = 0.0248);Loss of phosphorylation at T284 (P = 0.0248);Loss of phosphorylation at T284 (P = 0.0248);.;.;.;
MVP		0.91
MPC		0.33
ClinPred		0.76	D
GERP RS		5.2
PromoterAI		-0.013	Neutral
Varity_R		0.22
gMVP		0.45
Mutation Taster		=4/96	disease causing (ClinVar)

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: rs199422314; hg19: chr14-24709836;