NM_002485.5:c.221A>T

Variant names:

• chr8-89981474-T-A
• rs1060503471
• NM_002485.5:c.221A>T

Variant summary

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

The NM_002485.5(NBN):​c.221A>T​(p.Tyr74Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y74C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NBN NM_002485.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.82
• Publications: 0 publications found

Genes affected

NBN (HGNC:7652): (nibrin) Mutations in this gene are associated with Nijmegen breakage syndrome, an autosomal recessive chromosomal instability syndrome characterized by microcephaly, growth retardation, immunodeficiency, and cancer predisposition. The encoded protein is a member of the MRE11/RAD50 double-strand break repair complex which consists of 5 proteins. This gene product is thought to be involved in DNA double-strand break repair and DNA damage-induced checkpoint activation. [provided by RefSeq, Jul 2008]

NBN Gene-Disease associations (from GenCC):

• Nijmegen breakage syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health
• rhabdomyosarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• idiopathic aplastic anemia

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• prostate cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• hereditary breast carcinoma

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002485.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	NM_002485.5	MANE Select	c.221A>T	p.Tyr74Phe	missense	Exon 3 of 16	NP_002476.2
	NBN	NM_001024688.3		c.-26A>T		5_prime_UTR_premature_start_codon_gain	Exon 4 of 17	NP_001019859.1
	NBN	NM_001440379.1		c.-26A>T		5_prime_UTR_premature_start_codon_gain	Exon 3 of 16	NP_001427308.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	ENST00000265433.8	TSL:1 MANE Select	c.221A>T	p.Tyr74Phe	missense	Exon 3 of 16	ENSP00000265433.4
	NBN	ENST00000409330.5	TSL:5	c.-26A>T		5_prime_UTR_premature_start_codon_gain	Exon 3 of 16	ENSP00000386924.1
	NBN	ENST00000517337.2	TSL:4	c.-26A>T		5_prime_UTR_premature_start_codon_gain	Exon 4 of 17	ENSP00000429971.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Benign	-0.036	T
BayesDel_noAF	Benign	-0.29
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.50	T
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.073	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Benign	-0.81	T
MutationAssessor	Benign	1.5	L
PhyloP100		5.8
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-2.9	D
REVEL	Uncertain	0.51
Sift	Benign	0.077	T
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.69
MutPred		0.80		Gain of methylation at K73 (P = 0.0266)
MVP		0.66
MPC		0.37
ClinPred		0.99	D
GERP RS		5.8
PromoterAI		0.00060	Neutral
Varity_R		0.58
gMVP		0.39
Mutation Taster		=82/18	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: rs1060503471; hg19: chr8-90993702;