chr1-52414845-G-C

Variant names:

• chr1-52414845-G-C
• rs1322447419
• NM_032864.4:c.833G>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_032864.4(PRPF38A):​c.833G>C​(p.Arg278Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,774 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. R278H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: PRPF38A NM_032864.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.57
• Publications: 0 publications found

Genes affected

PRPF38A (HGNC:25930): (pre-mRNA processing factor 38A) Enables RNA binding activity. Involved in mRNA splicing, via spliceosome. Located in nucleoplasm. Part of U2-type precatalytic spliceosome. [provided by Alliance of Genome Resources, Apr 2022]

TUT4 (HGNC:28981): (terminal uridylyl transferase 4) Enables RNA uridylyltransferase activity. Involved in RNA metabolic process; negative regulation of transposition, RNA-mediated; and stem cell population maintenance. Located in cytoplasmic ribonucleoprotein granule; cytosol; and nucleolus. Implicated in liver benign neoplasm. Biomarker of breast cancer. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.33484024).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032864.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRPF38A	NM_032864.4	MANE Select	c.833G>C	p.Arg278Pro	missense	Exon 8 of 10	NP_116253.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRPF38A	ENST00000257181.10	TSL:1 MANE Select	c.833G>C	p.Arg278Pro	missense	Exon 8 of 10	ENSP00000257181.8	Q8NAV1-1
	PRPF38A	ENST00000474048.1	TSL:1	n.621G>C		non_coding_transcript_exon	Exon 6 of 8
	PRPF38A	ENST00000879463.1		c.863G>C	p.Arg288Pro	missense	Exon 8 of 10	ENSP00000549522.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461774 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727192

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111928

Other (OTH) AF: 0.00 AC: 0 AN: 60384

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Pathogenic	28
DANN	Uncertain	0.98
DEOGEN2	Benign	0.061	T
Eigen	Benign	0.17
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D
M_CAP	Benign	0.056	D
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	0.0	N
PhyloP100		7.6
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-2.2	N
REVEL	Uncertain	0.45
Sift	Benign	0.20	T
Sift4G	Benign	0.070	T
Polyphen		0.61	P
Vest4		0.56
MutPred		0.26		Gain of glycosylation at R278 (P = 0.0205)
MVP		0.51
MPC		0.63
ClinPred		0.78	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.34
gMVP		0.50
Mutation Taster		=41/59	disease causing

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: rs1322447419; hg19: chr1-52880517;