chr4-163148797-A-C

Variant names:

• chr4-163148797-A-C
• rs2320615
• NM_138386.3:c.541-363T>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_138386.3(NAF1):​c.541-363T>G variant causes a intron 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: NAF1 NM_138386.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.504
• Publications: 7 publications found

Genes affected

NAF1 (HGNC:25126): (nuclear assembly factor 1 ribonucleoprotein) Enables identical protein binding activity and telomerase RNA binding activity. Involved in regulation of nucleobase-containing compound metabolic process; ribosome biogenesis; and telomerase holoenzyme complex assembly. Located in nucleoplasm. Part of sno(s)RNA-containing ribonucleoprotein complex. [provided by Alliance of Genome Resources, Apr 2022]

NAF1 Gene-Disease associations (from GenCC):

• pulmonary fibrosis and/or bone marrow failure syndrome, telomere-related, 7

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

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NAF1	NM_138386.3	c.541-363T>G		intron_variant	Intron 2 of 7	ENST00000274054.3	NP_612395.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NAF1	ENST00000274054.3	c.541-363T>G		intron_variant	Intron 2 of 7	1	NM_138386.3	ENSP00000274054.2
NAF1	ENST00000422287.6	c.541-363T>G		intron_variant	Intron 2 of 7	1		ENSP00000408963.2
NAF1	ENST00000509232.5	n.645-363T>G		intron_variant	Intron 2 of 6	2

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	2.1
DANN	Benign	0.85
PhyloP100		-0.50

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: rs2320615; hg19: chr4-164069949;