rs1160517835

Positions:

• chr22-18921347-C-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_016335.6(PRODH):​c.1006G>A​(p.Ala336Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 13/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 0)
• Consequence: PRODH NM_016335.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.234

Genes affected

PRODH (HGNC:9453): (proline dehydrogenase 1) This gene encodes a mitochondrial protein that catalyzes the first step in proline degradation. Mutations in this gene are associated with hyperprolinemia type 1 and susceptibility to schizophrenia 4 (SCZD4). This gene is located on chromosome 22q11.21, a region which has also been associated with the contiguous gene deletion syndromes, DiGeorge and CATCH22. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2010]

ENSG00000283809 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.03703481).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PRODH	NM_016335.6	c.1006G>A	p.Ala336Thr	missense_variant	8/14	ENST00000357068.11	NP_057419.5
PRODH	NM_001195226.2	c.682G>A	p.Ala228Thr	missense_variant	8/14		NP_001182155.2
PRODH	NM_001368250.2	c.682G>A	p.Ala228Thr	missense_variant	8/14		NP_001355179.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PRODH	ENST00000357068.11	c.1006G>A	p.Ala336Thr	missense_variant	8/14	1	NM_016335.6	ENSP00000349577.6
ENSG00000283809	ENST00000638240.1	c.513+10319C>T		intron_variant		5		ENSP00000492446.1

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD3 exomes AF: 0.0000124 AC: 2 AN: 160816 Hom.: 0 AF XY: 0.0000236 AC XY: 2 AN XY: 84726

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000317

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 0

Alfa AF: 0.0000530 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Proline dehydrogenase deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 14, 2016

This sequence change replaces alanine with threonine at codon 336 of the PRODH protein (p.Ala336Thr). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and threonine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a PRODH-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: (SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). The threonine amino acid residue is also found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	5.0
DANN	Benign	0.87
DEOGEN2	Benign	0.0056	T;.;.;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.094	N
LIST_S2	Benign	0.71	T;.;T;.
M_CAP	Benign	0.0029	T
MetaRNN	Benign	0.037	T;T;T;T
MetaSVM	Benign	-1.1	T
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-0.35	.;N;N;N
REVEL	Benign	0.067
Sift	Benign	0.62	.;T;T;T
Sift4G	Benign	0.76	T;T;T;T
Polyphen		0.0	.;B;B;.
Vest4		0.028
MutPred		0.53		Gain of sheet (P = 0.0344);.;.;Gain of sheet (P = 0.0344);
MVP		0.030
MPC		0.27
ClinPred		0.026	T
GERP RS		-5.1
gMVP		0.32

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

Publications

LitVar

Other links and lift over

dbSNP: rs1160517835; hg19: chr22-18908860; COSMIC: COSV58230198; COSMIC: COSV58230198;